| 1 | #ifndef _LINUX_MM_H
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| 2 | #define _LINUX_MM_H
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| 3 |
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| 4 | #include <linux/errno.h>
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| 5 |
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| 6 | #ifdef __KERNEL__
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| 7 |
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| 8 | #include <linux/mmdebug.h>
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| 9 | #include <linux/gfp.h>
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| 10 | #include <linux/bug.h>
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| 11 | #include <linux/list.h>
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| 12 | #include <linux/mmzone.h>
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| 13 | #include <linux/rbtree.h>
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| 14 | #include <linux/atomic.h>
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| 15 | #include <linux/debug_locks.h>
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| 16 | #include <linux/mm_types.h>
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| 17 | #include <linux/range.h>
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| 18 | #include <linux/pfn.h>
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| 19 | #include <linux/percpu-refcount.h>
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| 20 | #include <linux/bit_spinlock.h>
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| 21 | #include <linux/shrinker.h>
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| 22 | #include <linux/resource.h>
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| 23 | #include <linux/page_ext.h>
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| 24 | #include <linux/err.h>
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| 25 |
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| 26 | struct mempolicy;
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| 27 | struct anon_vma;
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| 28 | struct anon_vma_chain;
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| 29 | struct file_ra_state;
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| 30 | struct user_struct;
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| 31 | struct writeback_control;
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| 32 | struct bdi_writeback;
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| 33 |
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| 34 | #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
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| 35 | extern unsigned long max_mapnr;
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| 36 |
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| 37 | static inline void set_max_mapnr(unsigned long limit)
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| 38 | {
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| 39 | max_mapnr = limit;
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| 40 | }
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| 41 | #else
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| 42 | static inline void set_max_mapnr(unsigned long limit) { }
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| 43 | #endif
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| 44 |
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| 45 | extern unsigned long totalram_pages;
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| 46 | extern void * high_memory;
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| 47 | extern int page_cluster;
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| 48 |
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| 49 | #ifdef CONFIG_SYSCTL
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| 50 | extern int sysctl_legacy_va_layout;
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| 51 | #else
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| 52 | #define sysctl_legacy_va_layout 0
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| 53 | #endif
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| 54 |
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| 55 | #include <asm/page.h>
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| 56 | #include <asm/pgtable.h>
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| 57 | #include <asm/processor.h>
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| 58 |
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| 59 | #ifndef __pa_symbol
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| 60 | #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
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| 61 | #endif
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| 62 |
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| 63 | #ifndef lm_alias
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| 64 | #define lm_alias(x) __va(__pa_symbol(x))
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| 65 | #endif
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| 66 |
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| 67 | /*
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| 68 | * To prevent common memory management code establishing
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| 69 | * a zero page mapping on a read fault.
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| 70 | * This macro should be defined within <asm/pgtable.h>.
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| 71 | * s390 does this to prevent multiplexing of hardware bits
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| 72 | * related to the physical page in case of virtualization.
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| 73 | */
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| 74 | #ifndef mm_forbids_zeropage
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| 75 | #define mm_forbids_zeropage(X) (0)
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| 76 | #endif
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| 77 |
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| 78 | extern unsigned long sysctl_user_reserve_kbytes;
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| 79 | extern unsigned long sysctl_admin_reserve_kbytes;
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| 80 |
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| 81 | extern int sysctl_overcommit_memory;
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| 82 | extern int sysctl_overcommit_ratio;
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| 83 | extern unsigned long sysctl_overcommit_kbytes;
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| 84 |
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| 85 | extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *,
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| 86 | size_t *, loff_t *);
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| 87 | extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *,
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| 88 | size_t *, loff_t *);
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| 89 |
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| 90 | #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
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| 91 |
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| 92 | /* to align the pointer to the (next) page boundary */
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| 93 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
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| 94 |
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| 95 | /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
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| 96 | #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE)
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| 97 |
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| 98 | /*
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| 99 | * Linux kernel virtual memory manager primitives.
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| 100 | * The idea being to have a "virtual" mm in the same way
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| 101 | * we have a virtual fs - giving a cleaner interface to the
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| 102 | * mm details, and allowing different kinds of memory mappings
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| 103 | * (from shared memory to executable loading to arbitrary
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| 104 | * mmap() functions).
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| 105 | */
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| 106 |
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| 107 | extern struct kmem_cache *vm_area_cachep;
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| 108 |
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| 109 | #ifndef CONFIG_MMU
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| 110 | extern struct rb_root nommu_region_tree;
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| 111 | extern struct rw_semaphore nommu_region_sem;
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| 112 |
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| 113 | extern unsigned int kobjsize(const void *objp);
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| 114 | #endif
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| 115 |
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| 116 | /*
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| 117 | * vm_flags in vm_area_struct, see mm_types.h.
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| 118 | * When changing, update also include/trace/events/mmflags.h
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| 119 | */
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| 120 | #define VM_NONE 0x00000000
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| 121 |
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| 122 | #define VM_READ 0x00000001 /* currently active flags */
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| 123 | #define VM_WRITE 0x00000002
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| 124 | #define VM_EXEC 0x00000004
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| 125 | #define VM_SHARED 0x00000008
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| 126 |
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| 127 | /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
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| 128 | #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
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| 129 | #define VM_MAYWRITE 0x00000020
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| 130 | #define VM_MAYEXEC 0x00000040
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| 131 | #define VM_MAYSHARE 0x00000080
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| 132 |
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| 133 | #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
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| 134 | #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */
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| 135 | #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
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| 136 | #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
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| 137 | #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */
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| 138 |
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| 139 | #define VM_LOCKED 0x00002000
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| 140 | #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
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| 141 |
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| 142 | /* Used by sys_madvise() */
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| 143 | #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
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| 144 | #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
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| 145 |
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| 146 | #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
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| 147 | #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
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| 148 | #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */
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| 149 | #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
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| 150 | #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
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| 151 | #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
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| 152 | #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
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| 153 | #define VM_ARCH_2 0x02000000
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| 154 | #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
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| 155 |
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| 156 | #ifdef CONFIG_MEM_SOFT_DIRTY
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| 157 | # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
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| 158 | #else
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| 159 | # define VM_SOFTDIRTY 0
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| 160 | #endif
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| 161 |
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| 162 | #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
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| 163 | #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
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| 164 | #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
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| 165 | #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
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| 166 |
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| 167 | #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS
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| 168 | #define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */
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| 169 | #define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */
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| 170 | #define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */
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| 171 | #define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */
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| 172 | #define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0)
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| 173 | #define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1)
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| 174 | #define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2)
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| 175 | #define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3)
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| 176 | #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */
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| 177 |
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| 178 | #if defined(CONFIG_X86)
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| 179 | # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
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| 180 | #if defined (CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS)
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| 181 | # define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0
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| 182 | # define VM_PKEY_BIT0 VM_HIGH_ARCH_0 /* A protection key is a 4-bit value */
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| 183 | # define VM_PKEY_BIT1 VM_HIGH_ARCH_1
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| 184 | # define VM_PKEY_BIT2 VM_HIGH_ARCH_2
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| 185 | # define VM_PKEY_BIT3 VM_HIGH_ARCH_3
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| 186 | #endif
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| 187 | #elif defined(CONFIG_PPC)
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| 188 | # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
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| 189 | #elif defined(CONFIG_PARISC)
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| 190 | # define VM_GROWSUP VM_ARCH_1
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| 191 | #elif defined(CONFIG_METAG)
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| 192 | # define VM_GROWSUP VM_ARCH_1
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| 193 | #elif defined(CONFIG_IA64)
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| 194 | # define VM_GROWSUP VM_ARCH_1
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| 195 | #elif !defined(CONFIG_MMU)
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| 196 | # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
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| 197 | #endif
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| 198 |
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| 199 | #if defined(CONFIG_X86)
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| 200 | /* MPX specific bounds table or bounds directory */
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| 201 | # define VM_MPX VM_ARCH_2
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| 202 | #endif
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| 203 |
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| 204 | #ifndef VM_GROWSUP
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| 205 | # define VM_GROWSUP VM_NONE
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| 206 | #endif
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| 207 |
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| 208 | /* Bits set in the VMA until the stack is in its final location */
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| 209 | #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
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| 210 |
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| 211 | #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
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| 212 | #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
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| 213 | #endif
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| 214 |
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| 215 | #ifdef CONFIG_STACK_GROWSUP
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| 216 | #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
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| 217 | #else
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| 218 | #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
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| 219 | #endif
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| 220 |
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| 221 | /*
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| 222 | * Special vmas that are non-mergable, non-mlock()able.
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| 223 | * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
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| 224 | */
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| 225 | #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
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| 226 |
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| 227 | /* This mask defines which mm->def_flags a process can inherit its parent */
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| 228 | #define VM_INIT_DEF_MASK VM_NOHUGEPAGE
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| 229 |
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| 230 | /* This mask is used to clear all the VMA flags used by mlock */
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| 231 | #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT))
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| 232 |
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| 233 | /*
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| 234 | * mapping from the currently active vm_flags protection bits (the
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| 235 | * low four bits) to a page protection mask..
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| 236 | */
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| 237 | extern pgprot_t protection_map[16];
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| 238 |
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| 239 | #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
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| 240 | #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */
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| 241 | #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */
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| 242 | #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */
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| 243 | #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */
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| 244 | #define FAULT_FLAG_TRIED 0x20 /* Second try */
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| 245 | #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */
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| 246 | #define FAULT_FLAG_REMOTE 0x80 /* faulting for non current tsk/mm */
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| 247 | #define FAULT_FLAG_INSTRUCTION 0x100 /* The fault was during an instruction fetch */
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| 248 |
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| 249 | /*
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| 250 | * vm_fault is filled by the the pagefault handler and passed to the vma's
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| 251 | * ->fault function. The vma's ->fault is responsible for returning a bitmask
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| 252 | * of VM_FAULT_xxx flags that give details about how the fault was handled.
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| 253 | *
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| 254 | * MM layer fills up gfp_mask for page allocations but fault handler might
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| 255 | * alter it if its implementation requires a different allocation context.
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| 256 | *
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| 257 | * pgoff should be used in favour of virtual_address, if possible.
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| 258 | */
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| 259 | struct vm_fault {
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| 260 | unsigned int flags; /* FAULT_FLAG_xxx flags */
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| 261 | gfp_t gfp_mask; /* gfp mask to be used for allocations */
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| 262 | pgoff_t pgoff; /* Logical page offset based on vma */
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| 263 | void __user *virtual_address; /* Faulting virtual address */
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| 264 |
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| 265 | struct page *cow_page; /* Handler may choose to COW */
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| 266 | struct page *page; /* ->fault handlers should return a
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| 267 | * page here, unless VM_FAULT_NOPAGE
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| 268 | * is set (which is also implied by
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| 269 | * VM_FAULT_ERROR).
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| 270 | */
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| 271 | void *entry; /* ->fault handler can alternatively
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| 272 | * return locked DAX entry. In that
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| 273 | * case handler should return
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| 274 | * VM_FAULT_DAX_LOCKED and fill in
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| 275 | * entry here.
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| 276 | */
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| 277 | /* for ->map_pages() only */
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| 278 | pgoff_t max_pgoff; /* map pages for offset from pgoff till
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| 279 | * max_pgoff inclusive */
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| 280 | pte_t *pte; /* pte entry associated with ->pgoff */
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| 281 | void *suse_kabi_padding;
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| 282 | };
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| 283 |
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| 284 | /*
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| 285 | * These are the virtual MM functions - opening of an area, closing and
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| 286 | * unmapping it (needed to keep files on disk up-to-date etc), pointer
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| 287 | * to the functions called when a no-page or a wp-page exception occurs.
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| 288 | */
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| 289 | struct vm_operations_struct {
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| 290 | void (*open)(struct vm_area_struct * area);
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| 291 | void (*close)(struct vm_area_struct * area);
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| 292 | int (*mremap)(struct vm_area_struct * area);
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| 293 | int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
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| 294 | int (*pmd_fault)(struct vm_area_struct *, unsigned long address,
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| 295 | pmd_t *, unsigned int flags);
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| 296 | void (*map_pages)(struct vm_area_struct *vma, struct vm_fault *vmf);
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| 297 |
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| 298 | /* notification that a previously read-only page is about to become
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| 299 | * writable, if an error is returned it will cause a SIGBUS */
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| 300 | int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
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| 301 |
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| 302 | /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */
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| 303 | int (*pfn_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
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| 304 |
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| 305 | /* called by access_process_vm when get_user_pages() fails, typically
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| 306 | * for use by special VMAs that can switch between memory and hardware
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| 307 | */
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| 308 | int (*access)(struct vm_area_struct *vma, unsigned long addr,
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| 309 | void *buf, int len, int write);
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| 310 |
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| 311 | /* Called by the /proc/PID/maps code to ask the vma whether it
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| 312 | * has a special name. Returning non-NULL will also cause this
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| 313 | * vma to be dumped unconditionally. */
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| 314 | const char *(*name)(struct vm_area_struct *vma);
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| 315 |
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| 316 | #ifdef CONFIG_NUMA
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| 317 | /*
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| 318 | * set_policy() op must add a reference to any non-NULL @new mempolicy
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| 319 | * to hold the policy upon return. Caller should pass NULL @new to
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| 320 | * remove a policy and fall back to surrounding context--i.e. do not
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| 321 | * install a MPOL_DEFAULT policy, nor the task or system default
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| 322 | * mempolicy.
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| 323 | */
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| 324 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
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| 325 |
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| 326 | /*
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| 327 | * get_policy() op must add reference [mpol_get()] to any policy at
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| 328 | * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
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| 329 | * in mm/mempolicy.c will do this automatically.
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| 330 | * get_policy() must NOT add a ref if the policy at (vma,addr) is not
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| 331 | * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
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| 332 | * If no [shared/vma] mempolicy exists at the addr, get_policy() op
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| 333 | * must return NULL--i.e., do not "fallback" to task or system default
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| 334 | * policy.
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| 335 | */
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| 336 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
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| 337 | unsigned long addr);
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| 338 | #endif
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| 339 | /*
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| 340 | * Called by vm_normal_page() for special PTEs to find the
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| 341 | * page for @addr. This is useful if the default behavior
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| 342 | * (using pte_page()) would not find the correct page.
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| 343 | */
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| 344 | struct page *(*find_special_page)(struct vm_area_struct *vma,
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| 345 | unsigned long addr);
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| 346 | };
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| 347 |
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| 348 | struct mmu_gather;
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| 349 | struct inode;
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| 350 |
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| 351 | #define page_private(page) ((page)->private)
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| 352 | #define set_page_private(page, v) ((page)->private = (v))
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| 353 |
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| 354 | #if !defined(__HAVE_ARCH_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE)
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| 355 | static inline int pmd_devmap(pmd_t pmd)
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| 356 | {
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| 357 | return 0;
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| 358 | }
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| 359 | #endif
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| 360 |
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| 361 | /*
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| 362 | * FIXME: take this include out, include page-flags.h in
|
|---|
| 363 | * files which need it (119 of them)
|
|---|
| 364 | */
|
|---|
| 365 | #include <linux/page-flags.h>
|
|---|
| 366 | #include <linux/huge_mm.h>
|
|---|
| 367 |
|
|---|
| 368 | /*
|
|---|
| 369 | * Methods to modify the page usage count.
|
|---|
| 370 | *
|
|---|
| 371 | * What counts for a page usage:
|
|---|
| 372 | * - cache mapping (page->mapping)
|
|---|
| 373 | * - private data (page->private)
|
|---|
| 374 | * - page mapped in a task's page tables, each mapping
|
|---|
| 375 | * is counted separately
|
|---|
| 376 | *
|
|---|
| 377 | * Also, many kernel routines increase the page count before a critical
|
|---|
| 378 | * routine so they can be sure the page doesn't go away from under them.
|
|---|
| 379 | */
|
|---|
| 380 |
|
|---|
| 381 | /*
|
|---|
| 382 | * Drop a ref, return true if the refcount fell to zero (the page has no users)
|
|---|
| 383 | */
|
|---|
| 384 | static inline int put_page_testzero(struct page *page)
|
|---|
| 385 | {
|
|---|
| 386 | VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0, page);
|
|---|
| 387 | return atomic_dec_and_test(&page->_count);
|
|---|
| 388 | }
|
|---|
| 389 |
|
|---|
| 390 | /*
|
|---|
| 391 | * Try to grab a ref unless the page has a refcount of zero, return false if
|
|---|
| 392 | * that is the case.
|
|---|
| 393 | * This can be called when MMU is off so it must not access
|
|---|
| 394 | * any of the virtual mappings.
|
|---|
| 395 | */
|
|---|
| 396 | static inline int get_page_unless_zero(struct page *page)
|
|---|
| 397 | {
|
|---|
| 398 | return atomic_inc_not_zero(&page->_count);
|
|---|
| 399 | }
|
|---|
| 400 |
|
|---|
| 401 | extern int page_is_ram(unsigned long pfn);
|
|---|
| 402 |
|
|---|
| 403 | enum {
|
|---|
| 404 | REGION_INTERSECTS,
|
|---|
| 405 | REGION_DISJOINT,
|
|---|
| 406 | REGION_MIXED,
|
|---|
| 407 | };
|
|---|
| 408 |
|
|---|
| 409 | int region_intersects(resource_size_t offset, size_t size, unsigned long flags,
|
|---|
| 410 | unsigned long desc);
|
|---|
| 411 |
|
|---|
| 412 | /* Support for virtually mapped pages */
|
|---|
| 413 | struct page *vmalloc_to_page(const void *addr);
|
|---|
| 414 | unsigned long vmalloc_to_pfn(const void *addr);
|
|---|
| 415 |
|
|---|
| 416 | /*
|
|---|
| 417 | * Determine if an address is within the vmalloc range
|
|---|
| 418 | *
|
|---|
| 419 | * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
|
|---|
| 420 | * is no special casing required.
|
|---|
| 421 | */
|
|---|
| 422 | static inline int is_vmalloc_addr(const void *x)
|
|---|
| 423 | {
|
|---|
| 424 | #ifdef CONFIG_MMU
|
|---|
| 425 | unsigned long addr = (unsigned long)x;
|
|---|
| 426 |
|
|---|
| 427 | return addr >= VMALLOC_START && addr < VMALLOC_END;
|
|---|
| 428 | #else
|
|---|
| 429 | return 0;
|
|---|
| 430 | #endif
|
|---|
| 431 | }
|
|---|
| 432 | #ifdef CONFIG_MMU
|
|---|
| 433 | extern int is_vmalloc_or_module_addr(const void *x);
|
|---|
| 434 | #else
|
|---|
| 435 | static inline int is_vmalloc_or_module_addr(const void *x)
|
|---|
| 436 | {
|
|---|
| 437 | return 0;
|
|---|
| 438 | }
|
|---|
| 439 | #endif
|
|---|
| 440 |
|
|---|
| 441 | extern void kvfree(const void *addr);
|
|---|
| 442 |
|
|---|
| 443 | static inline void compound_lock(struct page *page)
|
|---|
| 444 | {
|
|---|
| 445 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|---|
| 446 | VM_BUG_ON_PAGE(PageSlab(page), page);
|
|---|
| 447 | bit_spin_lock(PG_compound_lock, &page->flags);
|
|---|
| 448 | #endif
|
|---|
| 449 | }
|
|---|
| 450 |
|
|---|
| 451 | static inline void compound_unlock(struct page *page)
|
|---|
| 452 | {
|
|---|
| 453 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|---|
| 454 | VM_BUG_ON_PAGE(PageSlab(page), page);
|
|---|
| 455 | bit_spin_unlock(PG_compound_lock, &page->flags);
|
|---|
| 456 | #endif
|
|---|
| 457 | }
|
|---|
| 458 |
|
|---|
| 459 | static inline unsigned long compound_lock_irqsave(struct page *page)
|
|---|
| 460 | {
|
|---|
| 461 | unsigned long uninitialized_var(flags);
|
|---|
| 462 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|---|
| 463 | local_irq_save(flags);
|
|---|
| 464 | compound_lock(page);
|
|---|
| 465 | #endif
|
|---|
| 466 | return flags;
|
|---|
| 467 | }
|
|---|
| 468 |
|
|---|
| 469 | static inline void compound_unlock_irqrestore(struct page *page,
|
|---|
| 470 | unsigned long flags)
|
|---|
| 471 | {
|
|---|
| 472 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|---|
| 473 | compound_unlock(page);
|
|---|
| 474 | local_irq_restore(flags);
|
|---|
| 475 | #endif
|
|---|
| 476 | }
|
|---|
| 477 |
|
|---|
| 478 | /*
|
|---|
| 479 | * The atomic page->_mapcount, starts from -1: so that transitions
|
|---|
| 480 | * both from it and to it can be tracked, using atomic_inc_and_test
|
|---|
| 481 | * and atomic_add_negative(-1).
|
|---|
| 482 | */
|
|---|
| 483 | static inline void page_mapcount_reset(struct page *page)
|
|---|
| 484 | {
|
|---|
| 485 | atomic_set(&(page)->_mapcount, -1);
|
|---|
| 486 | }
|
|---|
| 487 |
|
|---|
| 488 | static inline int page_mapcount(struct page *page)
|
|---|
| 489 | {
|
|---|
| 490 | VM_BUG_ON_PAGE(PageSlab(page), page);
|
|---|
| 491 | return atomic_read(&page->_mapcount) + 1;
|
|---|
| 492 | }
|
|---|
| 493 |
|
|---|
| 494 | static inline int page_count(struct page *page)
|
|---|
| 495 | {
|
|---|
| 496 | return atomic_read(&compound_head(page)->_count);
|
|---|
| 497 | }
|
|---|
| 498 |
|
|---|
| 499 | static inline bool __compound_tail_refcounted(struct page *page)
|
|---|
| 500 | {
|
|---|
| 501 | return PageAnon(page) && !PageSlab(page) && !PageHeadHuge(page);
|
|---|
| 502 | }
|
|---|
| 503 |
|
|---|
| 504 | /*
|
|---|
| 505 | * This takes a head page as parameter and tells if the
|
|---|
| 506 | * tail page reference counting can be skipped.
|
|---|
| 507 | *
|
|---|
| 508 | * For this to be safe, PageSlab and PageHeadHuge must remain true on
|
|---|
| 509 | * any given page where they return true here, until all tail pins
|
|---|
| 510 | * have been released.
|
|---|
| 511 | */
|
|---|
| 512 | static inline bool compound_tail_refcounted(struct page *page)
|
|---|
| 513 | {
|
|---|
| 514 | VM_BUG_ON_PAGE(!PageHead(page), page);
|
|---|
| 515 | return __compound_tail_refcounted(page);
|
|---|
| 516 | }
|
|---|
| 517 |
|
|---|
| 518 | static inline void get_huge_page_tail(struct page *page)
|
|---|
| 519 | {
|
|---|
| 520 | /*
|
|---|
| 521 | * __split_huge_page_refcount() cannot run from under us.
|
|---|
| 522 | */
|
|---|
| 523 | VM_BUG_ON_PAGE(!PageTail(page), page);
|
|---|
| 524 | VM_BUG_ON_PAGE(page_mapcount(page) < 0, page);
|
|---|
| 525 | VM_BUG_ON_PAGE(atomic_read(&page->_count) != 0, page);
|
|---|
| 526 | if (compound_tail_refcounted(compound_head(page)))
|
|---|
| 527 | atomic_inc(&page->_mapcount);
|
|---|
| 528 | }
|
|---|
| 529 |
|
|---|
| 530 | extern bool __get_page_tail(struct page *page);
|
|---|
| 531 |
|
|---|
| 532 | static inline struct page *virt_to_head_page(const void *x)
|
|---|
| 533 | {
|
|---|
| 534 | struct page *page = virt_to_page(x);
|
|---|
| 535 |
|
|---|
| 536 | return compound_head(page);
|
|---|
| 537 | }
|
|---|
| 538 |
|
|---|
| 539 | /*
|
|---|
| 540 | * Setup the page count before being freed into the page allocator for
|
|---|
| 541 | * the first time (boot or memory hotplug)
|
|---|
| 542 | */
|
|---|
| 543 | static inline void init_page_count(struct page *page)
|
|---|
| 544 | {
|
|---|
| 545 | atomic_set(&page->_count, 1);
|
|---|
| 546 | }
|
|---|
| 547 |
|
|---|
| 548 | void put_page(struct page *page);
|
|---|
| 549 | void put_pages_list(struct list_head *pages);
|
|---|
| 550 |
|
|---|
| 551 | void split_page(struct page *page, unsigned int order);
|
|---|
| 552 |
|
|---|
| 553 | /*
|
|---|
| 554 | * Compound pages have a destructor function. Provide a
|
|---|
| 555 | * prototype for that function and accessor functions.
|
|---|
| 556 | * These are _only_ valid on the head of a compound page.
|
|---|
| 557 | */
|
|---|
| 558 | typedef void compound_page_dtor(struct page *);
|
|---|
| 559 |
|
|---|
| 560 | /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */
|
|---|
| 561 | enum compound_dtor_id {
|
|---|
| 562 | NULL_COMPOUND_DTOR,
|
|---|
| 563 | COMPOUND_PAGE_DTOR,
|
|---|
| 564 | #ifdef CONFIG_HUGETLB_PAGE
|
|---|
| 565 | HUGETLB_PAGE_DTOR,
|
|---|
| 566 | #endif
|
|---|
| 567 | NR_COMPOUND_DTORS,
|
|---|
| 568 | };
|
|---|
| 569 | extern compound_page_dtor * const compound_page_dtors[];
|
|---|
| 570 |
|
|---|
| 571 | static inline void set_compound_page_dtor(struct page *page,
|
|---|
| 572 | enum compound_dtor_id compound_dtor)
|
|---|
| 573 | {
|
|---|
| 574 | VM_BUG_ON_PAGE(compound_dtor >= NR_COMPOUND_DTORS, page);
|
|---|
| 575 | page[1].compound_dtor = compound_dtor;
|
|---|
| 576 | }
|
|---|
| 577 |
|
|---|
| 578 | static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
|
|---|
| 579 | {
|
|---|
| 580 | VM_BUG_ON_PAGE(page[1].compound_dtor >= NR_COMPOUND_DTORS, page);
|
|---|
| 581 | return compound_page_dtors[page[1].compound_dtor];
|
|---|
| 582 | }
|
|---|
| 583 |
|
|---|
| 584 | static inline unsigned int compound_order(struct page *page)
|
|---|
| 585 | {
|
|---|
| 586 | if (!PageHead(page))
|
|---|
| 587 | return 0;
|
|---|
| 588 | return page[1].compound_order;
|
|---|
| 589 | }
|
|---|
| 590 |
|
|---|
| 591 | static inline void set_compound_order(struct page *page, unsigned int order)
|
|---|
| 592 | {
|
|---|
| 593 | page[1].compound_order = order;
|
|---|
| 594 | }
|
|---|
| 595 |
|
|---|
| 596 | #ifdef CONFIG_MMU
|
|---|
| 597 | /*
|
|---|
| 598 | * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
|
|---|
| 599 | * servicing faults for write access. In the normal case, do always want
|
|---|
| 600 | * pte_mkwrite. But get_user_pages can cause write faults for mappings
|
|---|
| 601 | * that do not have writing enabled, when used by access_process_vm.
|
|---|
| 602 | */
|
|---|
| 603 | static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
|
|---|
| 604 | {
|
|---|
| 605 | if (likely(vma->vm_flags & VM_WRITE))
|
|---|
| 606 | pte = pte_mkwrite(pte);
|
|---|
| 607 | return pte;
|
|---|
| 608 | }
|
|---|
| 609 |
|
|---|
| 610 | void do_set_pte(struct vm_area_struct *vma, unsigned long address,
|
|---|
| 611 | struct page *page, pte_t *pte, bool write, bool anon);
|
|---|
| 612 | #endif
|
|---|
| 613 |
|
|---|
| 614 | /*
|
|---|
| 615 | * Multiple processes may "see" the same page. E.g. for untouched
|
|---|
| 616 | * mappings of /dev/null, all processes see the same page full of
|
|---|
| 617 | * zeroes, and text pages of executables and shared libraries have
|
|---|
| 618 | * only one copy in memory, at most, normally.
|
|---|
| 619 | *
|
|---|
| 620 | * For the non-reserved pages, page_count(page) denotes a reference count.
|
|---|
| 621 | * page_count() == 0 means the page is free. page->lru is then used for
|
|---|
| 622 | * freelist management in the buddy allocator.
|
|---|
| 623 | * page_count() > 0 means the page has been allocated.
|
|---|
| 624 | *
|
|---|
| 625 | * Pages are allocated by the slab allocator in order to provide memory
|
|---|
| 626 | * to kmalloc and kmem_cache_alloc. In this case, the management of the
|
|---|
| 627 | * page, and the fields in 'struct page' are the responsibility of mm/slab.c
|
|---|
| 628 | * unless a particular usage is carefully commented. (the responsibility of
|
|---|
| 629 | * freeing the kmalloc memory is the caller's, of course).
|
|---|
| 630 | *
|
|---|
| 631 | * A page may be used by anyone else who does a __get_free_page().
|
|---|
| 632 | * In this case, page_count still tracks the references, and should only
|
|---|
| 633 | * be used through the normal accessor functions. The top bits of page->flags
|
|---|
| 634 | * and page->virtual store page management information, but all other fields
|
|---|
| 635 | * are unused and could be used privately, carefully. The management of this
|
|---|
| 636 | * page is the responsibility of the one who allocated it, and those who have
|
|---|
| 637 | * subsequently been given references to it.
|
|---|
| 638 | *
|
|---|
| 639 | * The other pages (we may call them "pagecache pages") are completely
|
|---|
| 640 | * managed by the Linux memory manager: I/O, buffers, swapping etc.
|
|---|
| 641 | * The following discussion applies only to them.
|
|---|
| 642 | *
|
|---|
| 643 | * A pagecache page contains an opaque `private' member, which belongs to the
|
|---|
| 644 | * page's address_space. Usually, this is the address of a circular list of
|
|---|
| 645 | * the page's disk buffers. PG_private must be set to tell the VM to call
|
|---|
| 646 | * into the filesystem to release these pages.
|
|---|
| 647 | *
|
|---|
| 648 | * A page may belong to an inode's memory mapping. In this case, page->mapping
|
|---|
| 649 | * is the pointer to the inode, and page->index is the file offset of the page,
|
|---|
| 650 | * in units of PAGE_CACHE_SIZE.
|
|---|
| 651 | *
|
|---|
| 652 | * If pagecache pages are not associated with an inode, they are said to be
|
|---|
| 653 | * anonymous pages. These may become associated with the swapcache, and in that
|
|---|
| 654 | * case PG_swapcache is set, and page->private is an offset into the swapcache.
|
|---|
| 655 | *
|
|---|
| 656 | * In either case (swapcache or inode backed), the pagecache itself holds one
|
|---|
| 657 | * reference to the page. Setting PG_private should also increment the
|
|---|
| 658 | * refcount. The each user mapping also has a reference to the page.
|
|---|
| 659 | *
|
|---|
| 660 | * The pagecache pages are stored in a per-mapping radix tree, which is
|
|---|
| 661 | * rooted at mapping->page_tree, and indexed by offset.
|
|---|
| 662 | * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
|
|---|
| 663 | * lists, we instead now tag pages as dirty/writeback in the radix tree.
|
|---|
| 664 | *
|
|---|
| 665 | * All pagecache pages may be subject to I/O:
|
|---|
| 666 | * - inode pages may need to be read from disk,
|
|---|
| 667 | * - inode pages which have been modified and are MAP_SHARED may need
|
|---|
| 668 | * to be written back to the inode on disk,
|
|---|
| 669 | * - anonymous pages (including MAP_PRIVATE file mappings) which have been
|
|---|
| 670 | * modified may need to be swapped out to swap space and (later) to be read
|
|---|
| 671 | * back into memory.
|
|---|
| 672 | */
|
|---|
| 673 |
|
|---|
| 674 | /*
|
|---|
| 675 | * The zone field is never updated after free_area_init_core()
|
|---|
| 676 | * sets it, so none of the operations on it need to be atomic.
|
|---|
| 677 | */
|
|---|
| 678 |
|
|---|
| 679 | /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
|
|---|
| 680 | #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
|
|---|
| 681 | #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
|
|---|
| 682 | #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
|
|---|
| 683 | #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
|
|---|
| 684 |
|
|---|
| 685 | /*
|
|---|
| 686 | * Define the bit shifts to access each section. For non-existent
|
|---|
| 687 | * sections we define the shift as 0; that plus a 0 mask ensures
|
|---|
| 688 | * the compiler will optimise away reference to them.
|
|---|
| 689 | */
|
|---|
| 690 | #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
|
|---|
| 691 | #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
|
|---|
| 692 | #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
|
|---|
| 693 | #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
|
|---|
| 694 |
|
|---|
| 695 | /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
|
|---|
| 696 | #ifdef NODE_NOT_IN_PAGE_FLAGS
|
|---|
| 697 | #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
|
|---|
| 698 | #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
|
|---|
| 699 | SECTIONS_PGOFF : ZONES_PGOFF)
|
|---|
| 700 | #else
|
|---|
| 701 | #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
|
|---|
| 702 | #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
|
|---|
| 703 | NODES_PGOFF : ZONES_PGOFF)
|
|---|
| 704 | #endif
|
|---|
| 705 |
|
|---|
| 706 | #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
|
|---|
| 707 |
|
|---|
| 708 | #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
|
|---|
| 709 | #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
|
|---|
| 710 | #endif
|
|---|
| 711 |
|
|---|
| 712 | #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
|
|---|
| 713 | #define NODES_MASK ((1UL << NODES_WIDTH) - 1)
|
|---|
| 714 | #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
|
|---|
| 715 | #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
|
|---|
| 716 | #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
|
|---|
| 717 |
|
|---|
| 718 | static inline enum zone_type page_zonenum(const struct page *page)
|
|---|
| 719 | {
|
|---|
| 720 | return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
|
|---|
| 721 | }
|
|---|
| 722 |
|
|---|
| 723 | #ifdef CONFIG_ZONE_DEVICE
|
|---|
| 724 | void get_zone_device_page(struct page *page);
|
|---|
| 725 | void put_zone_device_page(struct page *page);
|
|---|
| 726 | static inline bool is_zone_device_page(const struct page *page)
|
|---|
| 727 | {
|
|---|
| 728 | return page_zonenum(page) == ZONE_DEVICE;
|
|---|
| 729 | }
|
|---|
| 730 | #else
|
|---|
| 731 | static inline void get_zone_device_page(struct page *page)
|
|---|
| 732 | {
|
|---|
| 733 | }
|
|---|
| 734 | static inline void put_zone_device_page(struct page *page)
|
|---|
| 735 | {
|
|---|
| 736 | }
|
|---|
| 737 | static inline bool is_zone_device_page(const struct page *page)
|
|---|
| 738 | {
|
|---|
| 739 | return false;
|
|---|
| 740 | }
|
|---|
| 741 | #endif
|
|---|
| 742 |
|
|---|
| 743 | static inline void get_page(struct page *page)
|
|---|
| 744 | {
|
|---|
| 745 | if (unlikely(PageTail(page)))
|
|---|
| 746 | if (likely(__get_page_tail(page))) {
|
|---|
| 747 | if (unlikely(is_zone_device_page(page)))
|
|---|
| 748 | get_zone_device_page(page);
|
|---|
| 749 | return;
|
|---|
| 750 | }
|
|---|
| 751 | /*
|
|---|
| 752 | * Getting a normal page or the head of a compound page
|
|---|
| 753 | * requires to already have an elevated page->_count.
|
|---|
| 754 | */
|
|---|
| 755 | VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page);
|
|---|
| 756 | atomic_inc(&page->_count);
|
|---|
| 757 |
|
|---|
| 758 | if (unlikely(is_zone_device_page(page)))
|
|---|
| 759 | get_zone_device_page(page);
|
|---|
| 760 | }
|
|---|
| 761 |
|
|---|
| 762 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
|
|---|
| 763 | #define SECTION_IN_PAGE_FLAGS
|
|---|
| 764 | #endif
|
|---|
| 765 |
|
|---|
| 766 | /*
|
|---|
| 767 | * The identification function is mainly used by the buddy allocator for
|
|---|
| 768 | * determining if two pages could be buddies. We are not really identifying
|
|---|
| 769 | * the zone since we could be using the section number id if we do not have
|
|---|
| 770 | * node id available in page flags.
|
|---|
| 771 | * We only guarantee that it will return the same value for two combinable
|
|---|
| 772 | * pages in a zone.
|
|---|
| 773 | */
|
|---|
| 774 | static inline int page_zone_id(struct page *page)
|
|---|
| 775 | {
|
|---|
| 776 | return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
|
|---|
| 777 | }
|
|---|
| 778 |
|
|---|
| 779 | static inline int zone_to_nid(struct zone *zone)
|
|---|
| 780 | {
|
|---|
| 781 | #ifdef CONFIG_NUMA
|
|---|
| 782 | return zone->node;
|
|---|
| 783 | #else
|
|---|
| 784 | return 0;
|
|---|
| 785 | #endif
|
|---|
| 786 | }
|
|---|
| 787 |
|
|---|
| 788 | #ifdef NODE_NOT_IN_PAGE_FLAGS
|
|---|
| 789 | extern int page_to_nid(const struct page *page);
|
|---|
| 790 | #else
|
|---|
| 791 | static inline int page_to_nid(const struct page *page)
|
|---|
| 792 | {
|
|---|
| 793 | return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
|
|---|
| 794 | }
|
|---|
| 795 | #endif
|
|---|
| 796 |
|
|---|
| 797 | #ifdef CONFIG_NUMA_BALANCING
|
|---|
| 798 | static inline int cpu_pid_to_cpupid(int cpu, int pid)
|
|---|
| 799 | {
|
|---|
| 800 | return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK);
|
|---|
| 801 | }
|
|---|
| 802 |
|
|---|
| 803 | static inline int cpupid_to_pid(int cpupid)
|
|---|
| 804 | {
|
|---|
| 805 | return cpupid & LAST__PID_MASK;
|
|---|
| 806 | }
|
|---|
| 807 |
|
|---|
| 808 | static inline int cpupid_to_cpu(int cpupid)
|
|---|
| 809 | {
|
|---|
| 810 | return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK;
|
|---|
| 811 | }
|
|---|
| 812 |
|
|---|
| 813 | static inline int cpupid_to_nid(int cpupid)
|
|---|
| 814 | {
|
|---|
| 815 | return cpu_to_node(cpupid_to_cpu(cpupid));
|
|---|
| 816 | }
|
|---|
| 817 |
|
|---|
| 818 | static inline bool cpupid_pid_unset(int cpupid)
|
|---|
| 819 | {
|
|---|
| 820 | return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK);
|
|---|
| 821 | }
|
|---|
| 822 |
|
|---|
| 823 | static inline bool cpupid_cpu_unset(int cpupid)
|
|---|
| 824 | {
|
|---|
| 825 | return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK);
|
|---|
| 826 | }
|
|---|
| 827 |
|
|---|
| 828 | static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid)
|
|---|
| 829 | {
|
|---|
| 830 | return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid);
|
|---|
| 831 | }
|
|---|
| 832 |
|
|---|
| 833 | #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
|
|---|
| 834 | #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
|
|---|
| 835 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
|
|---|
| 836 | {
|
|---|
| 837 | return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK);
|
|---|
| 838 | }
|
|---|
| 839 |
|
|---|
| 840 | static inline int page_cpupid_last(struct page *page)
|
|---|
| 841 | {
|
|---|
| 842 | return page->_last_cpupid;
|
|---|
| 843 | }
|
|---|
| 844 | static inline void page_cpupid_reset_last(struct page *page)
|
|---|
| 845 | {
|
|---|
| 846 | page->_last_cpupid = -1 & LAST_CPUPID_MASK;
|
|---|
| 847 | }
|
|---|
| 848 | #else
|
|---|
| 849 | static inline int page_cpupid_last(struct page *page)
|
|---|
| 850 | {
|
|---|
| 851 | return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK;
|
|---|
| 852 | }
|
|---|
| 853 |
|
|---|
| 854 | extern int page_cpupid_xchg_last(struct page *page, int cpupid);
|
|---|
| 855 |
|
|---|
| 856 | static inline void page_cpupid_reset_last(struct page *page)
|
|---|
| 857 | {
|
|---|
| 858 | page->flags |= LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT;
|
|---|
| 859 | }
|
|---|
| 860 | #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
|
|---|
| 861 | #else /* !CONFIG_NUMA_BALANCING */
|
|---|
| 862 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
|
|---|
| 863 | {
|
|---|
| 864 | return page_to_nid(page); /* XXX */
|
|---|
| 865 | }
|
|---|
| 866 |
|
|---|
| 867 | static inline int page_cpupid_last(struct page *page)
|
|---|
| 868 | {
|
|---|
| 869 | return page_to_nid(page); /* XXX */
|
|---|
| 870 | }
|
|---|
| 871 |
|
|---|
| 872 | static inline int cpupid_to_nid(int cpupid)
|
|---|
| 873 | {
|
|---|
| 874 | return -1;
|
|---|
| 875 | }
|
|---|
| 876 |
|
|---|
| 877 | static inline int cpupid_to_pid(int cpupid)
|
|---|
| 878 | {
|
|---|
| 879 | return -1;
|
|---|
| 880 | }
|
|---|
| 881 |
|
|---|
| 882 | static inline int cpupid_to_cpu(int cpupid)
|
|---|
| 883 | {
|
|---|
| 884 | return -1;
|
|---|
| 885 | }
|
|---|
| 886 |
|
|---|
| 887 | static inline int cpu_pid_to_cpupid(int nid, int pid)
|
|---|
| 888 | {
|
|---|
| 889 | return -1;
|
|---|
| 890 | }
|
|---|
| 891 |
|
|---|
| 892 | static inline bool cpupid_pid_unset(int cpupid)
|
|---|
| 893 | {
|
|---|
| 894 | return 1;
|
|---|
| 895 | }
|
|---|
| 896 |
|
|---|
| 897 | static inline void page_cpupid_reset_last(struct page *page)
|
|---|
| 898 | {
|
|---|
| 899 | }
|
|---|
| 900 |
|
|---|
| 901 | static inline bool cpupid_match_pid(struct task_struct *task, int cpupid)
|
|---|
| 902 | {
|
|---|
| 903 | return false;
|
|---|
| 904 | }
|
|---|
| 905 | #endif /* CONFIG_NUMA_BALANCING */
|
|---|
| 906 |
|
|---|
| 907 | static inline struct zone *page_zone(const struct page *page)
|
|---|
| 908 | {
|
|---|
| 909 | return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
|
|---|
| 910 | }
|
|---|
| 911 |
|
|---|
| 912 | #ifdef SECTION_IN_PAGE_FLAGS
|
|---|
| 913 | static inline void set_page_section(struct page *page, unsigned long section)
|
|---|
| 914 | {
|
|---|
| 915 | page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
|
|---|
| 916 | page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
|
|---|
| 917 | }
|
|---|
| 918 |
|
|---|
| 919 | static inline unsigned long page_to_section(const struct page *page)
|
|---|
| 920 | {
|
|---|
| 921 | return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
|
|---|
| 922 | }
|
|---|
| 923 | #endif
|
|---|
| 924 |
|
|---|
| 925 | static inline void set_page_zone(struct page *page, enum zone_type zone)
|
|---|
| 926 | {
|
|---|
| 927 | page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
|
|---|
| 928 | page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
|
|---|
| 929 | }
|
|---|
| 930 |
|
|---|
| 931 | static inline void set_page_node(struct page *page, unsigned long node)
|
|---|
| 932 | {
|
|---|
| 933 | page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
|
|---|
| 934 | page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
|
|---|
| 935 | }
|
|---|
| 936 |
|
|---|
| 937 | static inline void set_page_links(struct page *page, enum zone_type zone,
|
|---|
| 938 | unsigned long node, unsigned long pfn)
|
|---|
| 939 | {
|
|---|
| 940 | set_page_zone(page, zone);
|
|---|
| 941 | set_page_node(page, node);
|
|---|
| 942 | #ifdef SECTION_IN_PAGE_FLAGS
|
|---|
| 943 | set_page_section(page, pfn_to_section_nr(pfn));
|
|---|
| 944 | #endif
|
|---|
| 945 | }
|
|---|
| 946 |
|
|---|
| 947 | #ifdef CONFIG_MEMCG
|
|---|
| 948 | static inline struct mem_cgroup *page_memcg(struct page *page)
|
|---|
| 949 | {
|
|---|
| 950 | return page->mem_cgroup;
|
|---|
| 951 | }
|
|---|
| 952 |
|
|---|
| 953 | static inline void set_page_memcg(struct page *page, struct mem_cgroup *memcg)
|
|---|
| 954 | {
|
|---|
| 955 | page->mem_cgroup = memcg;
|
|---|
| 956 | }
|
|---|
| 957 | #else
|
|---|
| 958 | static inline struct mem_cgroup *page_memcg(struct page *page)
|
|---|
| 959 | {
|
|---|
| 960 | return NULL;
|
|---|
| 961 | }
|
|---|
| 962 |
|
|---|
| 963 | static inline void set_page_memcg(struct page *page, struct mem_cgroup *memcg)
|
|---|
| 964 | {
|
|---|
| 965 | }
|
|---|
| 966 | #endif
|
|---|
| 967 |
|
|---|
| 968 | /*
|
|---|
| 969 | * Some inline functions in vmstat.h depend on page_zone()
|
|---|
| 970 | */
|
|---|
| 971 | #include <linux/vmstat.h>
|
|---|
| 972 |
|
|---|
| 973 | static __always_inline void *lowmem_page_address(const struct page *page)
|
|---|
| 974 | {
|
|---|
| 975 | return __va(PFN_PHYS(page_to_pfn(page)));
|
|---|
| 976 | }
|
|---|
| 977 |
|
|---|
| 978 | #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
|
|---|
| 979 | #define HASHED_PAGE_VIRTUAL
|
|---|
| 980 | #endif
|
|---|
| 981 |
|
|---|
| 982 | #if defined(WANT_PAGE_VIRTUAL)
|
|---|
| 983 | static inline void *page_address(const struct page *page)
|
|---|
| 984 | {
|
|---|
| 985 | return page->virtual;
|
|---|
| 986 | }
|
|---|
| 987 | static inline void set_page_address(struct page *page, void *address)
|
|---|
| 988 | {
|
|---|
| 989 | page->virtual = address;
|
|---|
| 990 | }
|
|---|
| 991 | #define page_address_init() do { } while(0)
|
|---|
| 992 | #endif
|
|---|
| 993 |
|
|---|
| 994 | #if defined(HASHED_PAGE_VIRTUAL)
|
|---|
| 995 | void *page_address(const struct page *page);
|
|---|
| 996 | void set_page_address(struct page *page, void *virtual);
|
|---|
| 997 | void page_address_init(void);
|
|---|
| 998 | #endif
|
|---|
| 999 |
|
|---|
| 1000 | #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
|
|---|
| 1001 | #define page_address(page) lowmem_page_address(page)
|
|---|
| 1002 | #define set_page_address(page, address) do { } while(0)
|
|---|
| 1003 | #define page_address_init() do { } while(0)
|
|---|
| 1004 | #endif
|
|---|
| 1005 |
|
|---|
| 1006 | extern void *page_rmapping(struct page *page);
|
|---|
| 1007 | extern struct anon_vma *page_anon_vma(struct page *page);
|
|---|
| 1008 | extern struct address_space *page_mapping(struct page *page);
|
|---|
| 1009 |
|
|---|
| 1010 | extern struct address_space *__page_file_mapping(struct page *);
|
|---|
| 1011 |
|
|---|
| 1012 | static inline
|
|---|
| 1013 | struct address_space *page_file_mapping(struct page *page)
|
|---|
| 1014 | {
|
|---|
| 1015 | if (unlikely(PageSwapCache(page)))
|
|---|
| 1016 | return __page_file_mapping(page);
|
|---|
| 1017 |
|
|---|
| 1018 | return page->mapping;
|
|---|
| 1019 | }
|
|---|
| 1020 |
|
|---|
| 1021 | /*
|
|---|
| 1022 | * Return the pagecache index of the passed page. Regular pagecache pages
|
|---|
| 1023 | * use ->index whereas swapcache pages use ->private
|
|---|
| 1024 | */
|
|---|
| 1025 | static inline pgoff_t page_index(struct page *page)
|
|---|
| 1026 | {
|
|---|
| 1027 | if (unlikely(PageSwapCache(page)))
|
|---|
| 1028 | return page_private(page);
|
|---|
| 1029 | return page->index;
|
|---|
| 1030 | }
|
|---|
| 1031 |
|
|---|
| 1032 | extern pgoff_t __page_file_index(struct page *page);
|
|---|
| 1033 |
|
|---|
| 1034 | /*
|
|---|
| 1035 | * Return the file index of the page. Regular pagecache pages use ->index
|
|---|
| 1036 | * whereas swapcache pages use swp_offset(->private)
|
|---|
| 1037 | */
|
|---|
| 1038 | static inline pgoff_t page_file_index(struct page *page)
|
|---|
| 1039 | {
|
|---|
| 1040 | if (unlikely(PageSwapCache(page)))
|
|---|
| 1041 | return __page_file_index(page);
|
|---|
| 1042 |
|
|---|
| 1043 | return page->index;
|
|---|
| 1044 | }
|
|---|
| 1045 |
|
|---|
| 1046 | /*
|
|---|
| 1047 | * Return true if this page is mapped into pagetables.
|
|---|
| 1048 | */
|
|---|
| 1049 | static inline int page_mapped(struct page *page)
|
|---|
| 1050 | {
|
|---|
| 1051 | return atomic_read(&(page)->_mapcount) >= 0;
|
|---|
| 1052 | }
|
|---|
| 1053 |
|
|---|
| 1054 | /*
|
|---|
| 1055 | * Return true only if the page has been allocated with
|
|---|
| 1056 | * ALLOC_NO_WATERMARKS and the low watermark was not
|
|---|
| 1057 | * met implying that the system is under some pressure.
|
|---|
| 1058 | */
|
|---|
| 1059 | static inline bool page_is_pfmemalloc(struct page *page)
|
|---|
| 1060 | {
|
|---|
| 1061 | /*
|
|---|
| 1062 | * Page index cannot be this large so this must be
|
|---|
| 1063 | * a pfmemalloc page.
|
|---|
| 1064 | */
|
|---|
| 1065 | return page->index == -1UL;
|
|---|
| 1066 | }
|
|---|
| 1067 |
|
|---|
| 1068 | /*
|
|---|
| 1069 | * Only to be called by the page allocator on a freshly allocated
|
|---|
| 1070 | * page.
|
|---|
| 1071 | */
|
|---|
| 1072 | static inline void set_page_pfmemalloc(struct page *page)
|
|---|
| 1073 | {
|
|---|
| 1074 | page->index = -1UL;
|
|---|
| 1075 | }
|
|---|
| 1076 |
|
|---|
| 1077 | static inline void clear_page_pfmemalloc(struct page *page)
|
|---|
| 1078 | {
|
|---|
| 1079 | page->index = 0;
|
|---|
| 1080 | }
|
|---|
| 1081 |
|
|---|
| 1082 | /*
|
|---|
| 1083 | * Different kinds of faults, as returned by handle_mm_fault().
|
|---|
| 1084 | * Used to decide whether a process gets delivered SIGBUS or
|
|---|
| 1085 | * just gets major/minor fault counters bumped up.
|
|---|
| 1086 | */
|
|---|
| 1087 |
|
|---|
| 1088 | #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
|
|---|
| 1089 |
|
|---|
| 1090 | #define VM_FAULT_OOM 0x0001
|
|---|
| 1091 | #define VM_FAULT_SIGBUS 0x0002
|
|---|
| 1092 | #define VM_FAULT_MAJOR 0x0004
|
|---|
| 1093 | #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
|
|---|
| 1094 | #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
|
|---|
| 1095 | #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
|
|---|
| 1096 | #define VM_FAULT_SIGSEGV 0x0040
|
|---|
| 1097 |
|
|---|
| 1098 | #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
|
|---|
| 1099 | #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
|
|---|
| 1100 | #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
|
|---|
| 1101 | #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
|
|---|
| 1102 | #define VM_FAULT_DAX_LOCKED 0x1000 /* ->fault has locked DAX entry */
|
|---|
| 1103 |
|
|---|
| 1104 | #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
|
|---|
| 1105 |
|
|---|
| 1106 | #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
|
|---|
| 1107 | VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \
|
|---|
| 1108 | VM_FAULT_FALLBACK)
|
|---|
| 1109 |
|
|---|
| 1110 | /* Encode hstate index for a hwpoisoned large page */
|
|---|
| 1111 | #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
|
|---|
| 1112 | #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
|
|---|
| 1113 |
|
|---|
| 1114 | /*
|
|---|
| 1115 | * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
|
|---|
| 1116 | */
|
|---|
| 1117 | extern void pagefault_out_of_memory(void);
|
|---|
| 1118 |
|
|---|
| 1119 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
|
|---|
| 1120 |
|
|---|
| 1121 | /*
|
|---|
| 1122 | * Flags passed to show_mem() and show_free_areas() to suppress output in
|
|---|
| 1123 | * various contexts.
|
|---|
| 1124 | */
|
|---|
| 1125 | #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
|
|---|
| 1126 |
|
|---|
| 1127 | extern void show_free_areas(unsigned int flags);
|
|---|
| 1128 | extern bool skip_free_areas_node(unsigned int flags, int nid);
|
|---|
| 1129 |
|
|---|
| 1130 | int shmem_zero_setup(struct vm_area_struct *);
|
|---|
| 1131 | #ifdef CONFIG_SHMEM
|
|---|
| 1132 | bool shmem_mapping(struct address_space *mapping);
|
|---|
| 1133 | #else
|
|---|
| 1134 | static inline bool shmem_mapping(struct address_space *mapping)
|
|---|
| 1135 | {
|
|---|
| 1136 | return false;
|
|---|
| 1137 | }
|
|---|
| 1138 | #endif
|
|---|
| 1139 |
|
|---|
| 1140 | extern int can_do_mlock(void);
|
|---|
| 1141 | extern int user_shm_lock(size_t, struct user_struct *);
|
|---|
| 1142 | extern void user_shm_unlock(size_t, struct user_struct *);
|
|---|
| 1143 |
|
|---|
| 1144 | /*
|
|---|
| 1145 | * Parameter block passed down to zap_pte_range in exceptional cases.
|
|---|
| 1146 | */
|
|---|
| 1147 | struct zap_details {
|
|---|
| 1148 | struct address_space *check_mapping; /* Check page->mapping if set */
|
|---|
| 1149 | pgoff_t first_index; /* Lowest page->index to unmap */
|
|---|
| 1150 | pgoff_t last_index; /* Highest page->index to unmap */
|
|---|
| 1151 | };
|
|---|
| 1152 |
|
|---|
| 1153 | struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
|
|---|
| 1154 | pte_t pte);
|
|---|
| 1155 | struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
|
|---|
| 1156 | pmd_t pmd);
|
|---|
| 1157 |
|
|---|
| 1158 | int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
|
|---|
| 1159 | unsigned long size);
|
|---|
| 1160 | void zap_page_range(struct vm_area_struct *vma, unsigned long address,
|
|---|
| 1161 | unsigned long size, struct zap_details *);
|
|---|
| 1162 | void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
|
|---|
| 1163 | unsigned long start, unsigned long end);
|
|---|
| 1164 |
|
|---|
| 1165 | /**
|
|---|
| 1166 | * mm_walk - callbacks for walk_page_range
|
|---|
| 1167 | * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
|
|---|
| 1168 | * this handler is required to be able to handle
|
|---|
| 1169 | * pmd_trans_huge() pmds. They may simply choose to
|
|---|
| 1170 | * split_huge_page() instead of handling it explicitly.
|
|---|
| 1171 | * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
|
|---|
| 1172 | * @pte_hole: if set, called for each hole at all levels
|
|---|
| 1173 | * @hugetlb_entry: if set, called for each hugetlb entry
|
|---|
| 1174 | * @test_walk: caller specific callback function to determine whether
|
|---|
| 1175 | * we walk over the current vma or not. A positive returned
|
|---|
| 1176 | * value means "do page table walk over the current vma,"
|
|---|
| 1177 | * and a negative one means "abort current page table walk
|
|---|
| 1178 | * right now." 0 means "skip the current vma."
|
|---|
| 1179 | * @mm: mm_struct representing the target process of page table walk
|
|---|
| 1180 | * @vma: vma currently walked (NULL if walking outside vmas)
|
|---|
| 1181 | * @private: private data for callbacks' usage
|
|---|
| 1182 | *
|
|---|
| 1183 | * (see the comment on walk_page_range() for more details)
|
|---|
| 1184 | */
|
|---|
| 1185 | struct mm_walk {
|
|---|
| 1186 | int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
|
|---|
| 1187 | unsigned long next, struct mm_walk *walk);
|
|---|
| 1188 | int (*pte_entry)(pte_t *pte, unsigned long addr,
|
|---|
| 1189 | unsigned long next, struct mm_walk *walk);
|
|---|
| 1190 | int (*pte_hole)(unsigned long addr, unsigned long next,
|
|---|
| 1191 | struct mm_walk *walk);
|
|---|
| 1192 | int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
|
|---|
| 1193 | unsigned long addr, unsigned long next,
|
|---|
| 1194 | struct mm_walk *walk);
|
|---|
| 1195 | int (*test_walk)(unsigned long addr, unsigned long next,
|
|---|
| 1196 | struct mm_walk *walk);
|
|---|
| 1197 | struct mm_struct *mm;
|
|---|
| 1198 | struct vm_area_struct *vma;
|
|---|
| 1199 | void *private;
|
|---|
| 1200 | };
|
|---|
| 1201 |
|
|---|
| 1202 | int walk_page_range(unsigned long addr, unsigned long end,
|
|---|
| 1203 | struct mm_walk *walk);
|
|---|
| 1204 | int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk);
|
|---|
| 1205 | void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
|
|---|
| 1206 | unsigned long end, unsigned long floor, unsigned long ceiling);
|
|---|
| 1207 | int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
|
|---|
| 1208 | struct vm_area_struct *vma);
|
|---|
| 1209 | void unmap_mapping_range(struct address_space *mapping,
|
|---|
| 1210 | loff_t const holebegin, loff_t const holelen, int even_cows);
|
|---|
| 1211 | int follow_pfn(struct vm_area_struct *vma, unsigned long address,
|
|---|
| 1212 | unsigned long *pfn);
|
|---|
| 1213 | int follow_phys(struct vm_area_struct *vma, unsigned long address,
|
|---|
| 1214 | unsigned int flags, unsigned long *prot, resource_size_t *phys);
|
|---|
| 1215 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
|
|---|
| 1216 | void *buf, int len, int write);
|
|---|
| 1217 |
|
|---|
| 1218 | static inline void unmap_shared_mapping_range(struct address_space *mapping,
|
|---|
| 1219 | loff_t const holebegin, loff_t const holelen)
|
|---|
| 1220 | {
|
|---|
| 1221 | unmap_mapping_range(mapping, holebegin, holelen, 0);
|
|---|
| 1222 | }
|
|---|
| 1223 |
|
|---|
| 1224 | extern void truncate_pagecache(struct inode *inode, loff_t new);
|
|---|
| 1225 | extern void truncate_setsize(struct inode *inode, loff_t newsize);
|
|---|
| 1226 | void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to);
|
|---|
| 1227 | void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end);
|
|---|
| 1228 | int truncate_inode_page(struct address_space *mapping, struct page *page);
|
|---|
| 1229 | int generic_error_remove_page(struct address_space *mapping, struct page *page);
|
|---|
| 1230 | int invalidate_inode_page(struct page *page);
|
|---|
| 1231 |
|
|---|
| 1232 | #ifdef CONFIG_MMU
|
|---|
| 1233 | extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
|
|---|
| 1234 | unsigned long address, unsigned int flags);
|
|---|
| 1235 | extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
|
|---|
| 1236 | unsigned long address, unsigned int fault_flags);
|
|---|
| 1237 | #else
|
|---|
| 1238 | static inline int handle_mm_fault(struct mm_struct *mm,
|
|---|
| 1239 | struct vm_area_struct *vma, unsigned long address,
|
|---|
| 1240 | unsigned int flags)
|
|---|
| 1241 | {
|
|---|
| 1242 | /* should never happen if there's no MMU */
|
|---|
| 1243 | BUG();
|
|---|
| 1244 | return VM_FAULT_SIGBUS;
|
|---|
| 1245 | }
|
|---|
| 1246 | static inline int fixup_user_fault(struct task_struct *tsk,
|
|---|
| 1247 | struct mm_struct *mm, unsigned long address,
|
|---|
| 1248 | unsigned int fault_flags)
|
|---|
| 1249 | {
|
|---|
| 1250 | /* should never happen if there's no MMU */
|
|---|
| 1251 | BUG();
|
|---|
| 1252 | return -EFAULT;
|
|---|
| 1253 | }
|
|---|
| 1254 | #endif
|
|---|
| 1255 |
|
|---|
| 1256 | extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
|
|---|
| 1257 | extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
|
|---|
| 1258 | void *buf, int len, int write);
|
|---|
| 1259 |
|
|---|
| 1260 | long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
|
|---|
| 1261 | unsigned long start, unsigned long nr_pages,
|
|---|
| 1262 | unsigned int gup_flags, struct page **pages,
|
|---|
| 1263 | struct vm_area_struct **vmas, int *locked);
|
|---|
| 1264 | long get_user_pages(unsigned long start, unsigned long nr_pages,
|
|---|
| 1265 | unsigned int gup_flags, struct page **pages,
|
|---|
| 1266 | struct vm_area_struct **vmas);
|
|---|
| 1267 | long get_user_pages_locked(unsigned long start, unsigned long nr_pages,
|
|---|
| 1268 | unsigned int gup_flags, struct page **pages, int *locked);
|
|---|
| 1269 | long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages,
|
|---|
| 1270 | struct page **pages, unsigned int gup_flags);
|
|---|
| 1271 | int get_user_pages_fast(unsigned long start, int nr_pages, int write,
|
|---|
| 1272 | struct page **pages);
|
|---|
| 1273 |
|
|---|
| 1274 | /* Container for pinned pfns / pages */
|
|---|
| 1275 | struct frame_vector {
|
|---|
| 1276 | unsigned int nr_allocated; /* Number of frames we have space for */
|
|---|
| 1277 | unsigned int nr_frames; /* Number of frames stored in ptrs array */
|
|---|
| 1278 | bool got_ref; /* Did we pin pages by getting page ref? */
|
|---|
| 1279 | bool is_pfns; /* Does array contain pages or pfns? */
|
|---|
| 1280 | void *ptrs[0]; /* Array of pinned pfns / pages. Use
|
|---|
| 1281 | * pfns_vector_pages() or pfns_vector_pfns()
|
|---|
| 1282 | * for access */
|
|---|
| 1283 | };
|
|---|
| 1284 |
|
|---|
| 1285 | struct frame_vector *frame_vector_create(unsigned int nr_frames);
|
|---|
| 1286 | void frame_vector_destroy(struct frame_vector *vec);
|
|---|
| 1287 | int get_vaddr_frames(unsigned long start, unsigned int nr_pfns,
|
|---|
| 1288 | bool write, bool force, struct frame_vector *vec);
|
|---|
| 1289 | void put_vaddr_frames(struct frame_vector *vec);
|
|---|
| 1290 | int frame_vector_to_pages(struct frame_vector *vec);
|
|---|
| 1291 | void frame_vector_to_pfns(struct frame_vector *vec);
|
|---|
| 1292 |
|
|---|
| 1293 | static inline unsigned int frame_vector_count(struct frame_vector *vec)
|
|---|
| 1294 | {
|
|---|
| 1295 | return vec->nr_frames;
|
|---|
| 1296 | }
|
|---|
| 1297 |
|
|---|
| 1298 | static inline struct page **frame_vector_pages(struct frame_vector *vec)
|
|---|
| 1299 | {
|
|---|
| 1300 | if (vec->is_pfns) {
|
|---|
| 1301 | int err = frame_vector_to_pages(vec);
|
|---|
| 1302 |
|
|---|
| 1303 | if (err)
|
|---|
| 1304 | return ERR_PTR(err);
|
|---|
| 1305 | }
|
|---|
| 1306 | return (struct page **)(vec->ptrs);
|
|---|
| 1307 | }
|
|---|
| 1308 |
|
|---|
| 1309 | static inline unsigned long *frame_vector_pfns(struct frame_vector *vec)
|
|---|
| 1310 | {
|
|---|
| 1311 | if (!vec->is_pfns)
|
|---|
| 1312 | frame_vector_to_pfns(vec);
|
|---|
| 1313 | return (unsigned long *)(vec->ptrs);
|
|---|
| 1314 | }
|
|---|
| 1315 |
|
|---|
| 1316 | struct kvec;
|
|---|
| 1317 | int get_kernel_pages(const struct kvec *iov, int nr_pages, int write,
|
|---|
| 1318 | struct page **pages);
|
|---|
| 1319 | int get_kernel_page(unsigned long start, int write, struct page **pages);
|
|---|
| 1320 | struct page *get_dump_page(unsigned long addr);
|
|---|
| 1321 |
|
|---|
| 1322 | extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
|
|---|
| 1323 | extern void do_invalidatepage(struct page *page, unsigned int offset,
|
|---|
| 1324 | unsigned int length);
|
|---|
| 1325 |
|
|---|
| 1326 | int __set_page_dirty_nobuffers(struct page *page);
|
|---|
| 1327 | int __set_page_dirty_no_writeback(struct page *page);
|
|---|
| 1328 | int redirty_page_for_writepage(struct writeback_control *wbc,
|
|---|
| 1329 | struct page *page);
|
|---|
| 1330 | void account_page_dirtied(struct page *page, struct address_space *mapping,
|
|---|
| 1331 | struct mem_cgroup *memcg);
|
|---|
| 1332 | void account_page_cleaned(struct page *page, struct address_space *mapping,
|
|---|
| 1333 | struct mem_cgroup *memcg, struct bdi_writeback *wb);
|
|---|
| 1334 | int set_page_dirty(struct page *page);
|
|---|
| 1335 | int set_page_dirty_lock(struct page *page);
|
|---|
| 1336 | void cancel_dirty_page(struct page *page);
|
|---|
| 1337 | int clear_page_dirty_for_io(struct page *page);
|
|---|
| 1338 |
|
|---|
| 1339 | int get_cmdline(struct task_struct *task, char *buffer, int buflen);
|
|---|
| 1340 |
|
|---|
| 1341 | static inline bool vma_is_anonymous(struct vm_area_struct *vma)
|
|---|
| 1342 | {
|
|---|
| 1343 | return !vma->vm_ops;
|
|---|
| 1344 | }
|
|---|
| 1345 |
|
|---|
| 1346 | int vma_is_stack_for_task(struct vm_area_struct *vma, struct task_struct *t);
|
|---|
| 1347 |
|
|---|
| 1348 | extern unsigned long move_page_tables(struct vm_area_struct *vma,
|
|---|
| 1349 | unsigned long old_addr, struct vm_area_struct *new_vma,
|
|---|
| 1350 | unsigned long new_addr, unsigned long len,
|
|---|
| 1351 | bool need_rmap_locks);
|
|---|
| 1352 | extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start,
|
|---|
| 1353 | unsigned long end, pgprot_t newprot,
|
|---|
| 1354 | int dirty_accountable, int prot_numa);
|
|---|
| 1355 | extern int mprotect_fixup(struct vm_area_struct *vma,
|
|---|
| 1356 | struct vm_area_struct **pprev, unsigned long start,
|
|---|
| 1357 | unsigned long end, unsigned long newflags);
|
|---|
| 1358 |
|
|---|
| 1359 | /*
|
|---|
| 1360 | * doesn't attempt to fault and will return short.
|
|---|
| 1361 | */
|
|---|
| 1362 | int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
|
|---|
| 1363 | struct page **pages);
|
|---|
| 1364 | /*
|
|---|
| 1365 | * per-process(per-mm_struct) statistics.
|
|---|
| 1366 | */
|
|---|
| 1367 | static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
|
|---|
| 1368 | {
|
|---|
| 1369 | long val = atomic_long_read(&mm->rss_stat.count[member]);
|
|---|
| 1370 |
|
|---|
| 1371 | #ifdef SPLIT_RSS_COUNTING
|
|---|
| 1372 | /*
|
|---|
| 1373 | * counter is updated in asynchronous manner and may go to minus.
|
|---|
| 1374 | * But it's never be expected number for users.
|
|---|
| 1375 | */
|
|---|
| 1376 | if (val < 0)
|
|---|
| 1377 | val = 0;
|
|---|
| 1378 | #endif
|
|---|
| 1379 | return (unsigned long)val;
|
|---|
| 1380 | }
|
|---|
| 1381 |
|
|---|
| 1382 | static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
|
|---|
| 1383 | {
|
|---|
| 1384 | atomic_long_add(value, &mm->rss_stat.count[member]);
|
|---|
| 1385 | }
|
|---|
| 1386 |
|
|---|
| 1387 | static inline void inc_mm_counter(struct mm_struct *mm, int member)
|
|---|
| 1388 | {
|
|---|
| 1389 | atomic_long_inc(&mm->rss_stat.count[member]);
|
|---|
| 1390 | }
|
|---|
| 1391 |
|
|---|
| 1392 | static inline void dec_mm_counter(struct mm_struct *mm, int member)
|
|---|
| 1393 | {
|
|---|
| 1394 | atomic_long_dec(&mm->rss_stat.count[member]);
|
|---|
| 1395 | }
|
|---|
| 1396 |
|
|---|
| 1397 | /* Optimized variant when page is already known not to be PageAnon */
|
|---|
| 1398 | static inline int mm_counter_file(struct page *page)
|
|---|
| 1399 | {
|
|---|
| 1400 | if (PageSwapBacked(page))
|
|---|
| 1401 | return MM_SHMEMPAGES;
|
|---|
| 1402 | return MM_FILEPAGES;
|
|---|
| 1403 | }
|
|---|
| 1404 |
|
|---|
| 1405 | static inline int mm_counter(struct page *page)
|
|---|
| 1406 | {
|
|---|
| 1407 | if (PageAnon(page))
|
|---|
| 1408 | return MM_ANONPAGES;
|
|---|
| 1409 | return mm_counter_file(page);
|
|---|
| 1410 | }
|
|---|
| 1411 |
|
|---|
| 1412 | static inline unsigned long get_mm_rss(struct mm_struct *mm)
|
|---|
| 1413 | {
|
|---|
| 1414 | return get_mm_counter(mm, MM_FILEPAGES) +
|
|---|
| 1415 | get_mm_counter(mm, MM_ANONPAGES) +
|
|---|
| 1416 | get_mm_counter(mm, MM_SHMEMPAGES);
|
|---|
| 1417 | }
|
|---|
| 1418 |
|
|---|
| 1419 | static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
|
|---|
| 1420 | {
|
|---|
| 1421 | return max(mm->hiwater_rss, get_mm_rss(mm));
|
|---|
| 1422 | }
|
|---|
| 1423 |
|
|---|
| 1424 | static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
|
|---|
| 1425 | {
|
|---|
| 1426 | return max(mm->hiwater_vm, mm->total_vm);
|
|---|
| 1427 | }
|
|---|
| 1428 |
|
|---|
| 1429 | static inline void update_hiwater_rss(struct mm_struct *mm)
|
|---|
| 1430 | {
|
|---|
| 1431 | unsigned long _rss = get_mm_rss(mm);
|
|---|
| 1432 |
|
|---|
| 1433 | if ((mm)->hiwater_rss < _rss)
|
|---|
| 1434 | (mm)->hiwater_rss = _rss;
|
|---|
| 1435 | }
|
|---|
| 1436 |
|
|---|
| 1437 | static inline void update_hiwater_vm(struct mm_struct *mm)
|
|---|
| 1438 | {
|
|---|
| 1439 | if (mm->hiwater_vm < mm->total_vm)
|
|---|
| 1440 | mm->hiwater_vm = mm->total_vm;
|
|---|
| 1441 | }
|
|---|
| 1442 |
|
|---|
| 1443 | static inline void reset_mm_hiwater_rss(struct mm_struct *mm)
|
|---|
| 1444 | {
|
|---|
| 1445 | mm->hiwater_rss = get_mm_rss(mm);
|
|---|
| 1446 | }
|
|---|
| 1447 |
|
|---|
| 1448 | static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
|
|---|
| 1449 | struct mm_struct *mm)
|
|---|
| 1450 | {
|
|---|
| 1451 | unsigned long hiwater_rss = get_mm_hiwater_rss(mm);
|
|---|
| 1452 |
|
|---|
| 1453 | if (*maxrss < hiwater_rss)
|
|---|
| 1454 | *maxrss = hiwater_rss;
|
|---|
| 1455 | }
|
|---|
| 1456 |
|
|---|
| 1457 | #if defined(SPLIT_RSS_COUNTING)
|
|---|
| 1458 | void sync_mm_rss(struct mm_struct *mm);
|
|---|
| 1459 | #else
|
|---|
| 1460 | static inline void sync_mm_rss(struct mm_struct *mm)
|
|---|
| 1461 | {
|
|---|
| 1462 | }
|
|---|
| 1463 | #endif
|
|---|
| 1464 |
|
|---|
| 1465 | #ifndef __HAVE_ARCH_PTE_DEVMAP
|
|---|
| 1466 | static inline int pte_devmap(pte_t pte)
|
|---|
| 1467 | {
|
|---|
| 1468 | return 0;
|
|---|
| 1469 | }
|
|---|
| 1470 | #endif
|
|---|
| 1471 |
|
|---|
| 1472 | int vma_wants_writenotify(struct vm_area_struct *vma);
|
|---|
| 1473 |
|
|---|
| 1474 | extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
|
|---|
| 1475 | spinlock_t **ptl);
|
|---|
| 1476 | static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
|
|---|
| 1477 | spinlock_t **ptl)
|
|---|
| 1478 | {
|
|---|
| 1479 | pte_t *ptep;
|
|---|
| 1480 | __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl));
|
|---|
| 1481 | return ptep;
|
|---|
| 1482 | }
|
|---|
| 1483 |
|
|---|
| 1484 | #ifdef __PAGETABLE_PUD_FOLDED
|
|---|
| 1485 | static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
|
|---|
| 1486 | unsigned long address)
|
|---|
| 1487 | {
|
|---|
| 1488 | return 0;
|
|---|
| 1489 | }
|
|---|
| 1490 | #else
|
|---|
| 1491 | int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
|
|---|
| 1492 | #endif
|
|---|
| 1493 |
|
|---|
| 1494 | #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU)
|
|---|
| 1495 | static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
|
|---|
| 1496 | unsigned long address)
|
|---|
| 1497 | {
|
|---|
| 1498 | return 0;
|
|---|
| 1499 | }
|
|---|
| 1500 |
|
|---|
| 1501 | static inline void mm_nr_pmds_init(struct mm_struct *mm) {}
|
|---|
| 1502 |
|
|---|
| 1503 | static inline unsigned long mm_nr_pmds(struct mm_struct *mm)
|
|---|
| 1504 | {
|
|---|
| 1505 | return 0;
|
|---|
| 1506 | }
|
|---|
| 1507 |
|
|---|
| 1508 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) {}
|
|---|
| 1509 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) {}
|
|---|
| 1510 |
|
|---|
| 1511 | #else
|
|---|
| 1512 | int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
|
|---|
| 1513 |
|
|---|
| 1514 | static inline void mm_nr_pmds_init(struct mm_struct *mm)
|
|---|
| 1515 | {
|
|---|
| 1516 | atomic_long_set(&mm->nr_pmds, 0);
|
|---|
| 1517 | }
|
|---|
| 1518 |
|
|---|
| 1519 | static inline unsigned long mm_nr_pmds(struct mm_struct *mm)
|
|---|
| 1520 | {
|
|---|
| 1521 | return atomic_long_read(&mm->nr_pmds);
|
|---|
| 1522 | }
|
|---|
| 1523 |
|
|---|
| 1524 | static inline void mm_inc_nr_pmds(struct mm_struct *mm)
|
|---|
| 1525 | {
|
|---|
| 1526 | atomic_long_inc(&mm->nr_pmds);
|
|---|
| 1527 | }
|
|---|
| 1528 |
|
|---|
| 1529 | static inline void mm_dec_nr_pmds(struct mm_struct *mm)
|
|---|
| 1530 | {
|
|---|
| 1531 | atomic_long_dec(&mm->nr_pmds);
|
|---|
| 1532 | }
|
|---|
| 1533 | #endif
|
|---|
| 1534 |
|
|---|
| 1535 | int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
|
|---|
| 1536 | pmd_t *pmd, unsigned long address);
|
|---|
| 1537 | int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
|
|---|
| 1538 |
|
|---|
| 1539 | /*
|
|---|
| 1540 | * The following ifdef needed to get the 4level-fixup.h header to work.
|
|---|
| 1541 | * Remove it when 4level-fixup.h has been removed.
|
|---|
| 1542 | */
|
|---|
| 1543 | #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
|
|---|
| 1544 | static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
|
|---|
| 1545 | {
|
|---|
| 1546 | return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
|
|---|
| 1547 | NULL: pud_offset(pgd, address);
|
|---|
| 1548 | }
|
|---|
| 1549 |
|
|---|
| 1550 | static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
|
|---|
| 1551 | {
|
|---|
| 1552 | return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
|
|---|
| 1553 | NULL: pmd_offset(pud, address);
|
|---|
| 1554 | }
|
|---|
| 1555 | #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
|
|---|
| 1556 |
|
|---|
| 1557 | #if USE_SPLIT_PTE_PTLOCKS
|
|---|
| 1558 | #if ALLOC_SPLIT_PTLOCKS
|
|---|
| 1559 | void __init ptlock_cache_init(void);
|
|---|
| 1560 | extern bool ptlock_alloc(struct page *page);
|
|---|
| 1561 | extern void ptlock_free(struct page *page);
|
|---|
| 1562 |
|
|---|
| 1563 | static inline spinlock_t *ptlock_ptr(struct page *page)
|
|---|
| 1564 | {
|
|---|
| 1565 | return page->ptl;
|
|---|
| 1566 | }
|
|---|
| 1567 | #else /* ALLOC_SPLIT_PTLOCKS */
|
|---|
| 1568 | static inline void ptlock_cache_init(void)
|
|---|
| 1569 | {
|
|---|
| 1570 | }
|
|---|
| 1571 |
|
|---|
| 1572 | static inline bool ptlock_alloc(struct page *page)
|
|---|
| 1573 | {
|
|---|
| 1574 | return true;
|
|---|
| 1575 | }
|
|---|
| 1576 |
|
|---|
| 1577 | static inline void ptlock_free(struct page *page)
|
|---|
| 1578 | {
|
|---|
| 1579 | }
|
|---|
| 1580 |
|
|---|
| 1581 | static inline spinlock_t *ptlock_ptr(struct page *page)
|
|---|
| 1582 | {
|
|---|
| 1583 | return &page->ptl;
|
|---|
| 1584 | }
|
|---|
| 1585 | #endif /* ALLOC_SPLIT_PTLOCKS */
|
|---|
| 1586 |
|
|---|
| 1587 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
|
|---|
| 1588 | {
|
|---|
| 1589 | return ptlock_ptr(pmd_page(*pmd));
|
|---|
| 1590 | }
|
|---|
| 1591 |
|
|---|
| 1592 | static inline bool ptlock_init(struct page *page)
|
|---|
| 1593 | {
|
|---|
| 1594 | /*
|
|---|
| 1595 | * prep_new_page() initialize page->private (and therefore page->ptl)
|
|---|
| 1596 | * with 0. Make sure nobody took it in use in between.
|
|---|
| 1597 | *
|
|---|
| 1598 | * It can happen if arch try to use slab for page table allocation:
|
|---|
| 1599 | * slab code uses page->slab_cache, which share storage with page->ptl.
|
|---|
| 1600 | */
|
|---|
| 1601 | VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page);
|
|---|
| 1602 | if (!ptlock_alloc(page))
|
|---|
| 1603 | return false;
|
|---|
| 1604 | spin_lock_init(ptlock_ptr(page));
|
|---|
| 1605 | return true;
|
|---|
| 1606 | }
|
|---|
| 1607 |
|
|---|
| 1608 | /* Reset page->mapping so free_pages_check won't complain. */
|
|---|
| 1609 | static inline void pte_lock_deinit(struct page *page)
|
|---|
| 1610 | {
|
|---|
| 1611 | page->mapping = NULL;
|
|---|
| 1612 | ptlock_free(page);
|
|---|
| 1613 | }
|
|---|
| 1614 |
|
|---|
| 1615 | #else /* !USE_SPLIT_PTE_PTLOCKS */
|
|---|
| 1616 | /*
|
|---|
| 1617 | * We use mm->page_table_lock to guard all pagetable pages of the mm.
|
|---|
| 1618 | */
|
|---|
| 1619 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
|
|---|
| 1620 | {
|
|---|
| 1621 | return &mm->page_table_lock;
|
|---|
| 1622 | }
|
|---|
| 1623 | static inline void ptlock_cache_init(void) {}
|
|---|
| 1624 | static inline bool ptlock_init(struct page *page) { return true; }
|
|---|
| 1625 | static inline void pte_lock_deinit(struct page *page) {}
|
|---|
| 1626 | #endif /* USE_SPLIT_PTE_PTLOCKS */
|
|---|
| 1627 |
|
|---|
| 1628 | static inline void pgtable_init(void)
|
|---|
| 1629 | {
|
|---|
| 1630 | ptlock_cache_init();
|
|---|
| 1631 | pgtable_cache_init();
|
|---|
| 1632 | }
|
|---|
| 1633 |
|
|---|
| 1634 | static inline bool pgtable_page_ctor(struct page *page)
|
|---|
| 1635 | {
|
|---|
| 1636 | if (!ptlock_init(page))
|
|---|
| 1637 | return false;
|
|---|
| 1638 | inc_zone_page_state(page, NR_PAGETABLE);
|
|---|
| 1639 | return true;
|
|---|
| 1640 | }
|
|---|
| 1641 |
|
|---|
| 1642 | static inline void pgtable_page_dtor(struct page *page)
|
|---|
| 1643 | {
|
|---|
| 1644 | pte_lock_deinit(page);
|
|---|
| 1645 | dec_zone_page_state(page, NR_PAGETABLE);
|
|---|
| 1646 | }
|
|---|
| 1647 |
|
|---|
| 1648 | #define pte_offset_map_lock(mm, pmd, address, ptlp) \
|
|---|
| 1649 | ({ \
|
|---|
| 1650 | spinlock_t *__ptl = pte_lockptr(mm, pmd); \
|
|---|
| 1651 | pte_t *__pte = pte_offset_map(pmd, address); \
|
|---|
| 1652 | *(ptlp) = __ptl; \
|
|---|
| 1653 | spin_lock(__ptl); \
|
|---|
| 1654 | __pte; \
|
|---|
| 1655 | })
|
|---|
| 1656 |
|
|---|
| 1657 | #define pte_unmap_unlock(pte, ptl) do { \
|
|---|
| 1658 | spin_unlock(ptl); \
|
|---|
| 1659 | pte_unmap(pte); \
|
|---|
| 1660 | } while (0)
|
|---|
| 1661 |
|
|---|
| 1662 | #define pte_alloc_map(mm, vma, pmd, address) \
|
|---|
| 1663 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
|
|---|
| 1664 | pmd, address))? \
|
|---|
| 1665 | NULL: pte_offset_map(pmd, address))
|
|---|
| 1666 |
|
|---|
| 1667 | #define pte_alloc_map_lock(mm, pmd, address, ptlp) \
|
|---|
| 1668 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
|
|---|
| 1669 | pmd, address))? \
|
|---|
| 1670 | NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
|
|---|
| 1671 |
|
|---|
| 1672 | #define pte_alloc_kernel(pmd, address) \
|
|---|
| 1673 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
|
|---|
| 1674 | NULL: pte_offset_kernel(pmd, address))
|
|---|
| 1675 |
|
|---|
| 1676 | #if USE_SPLIT_PMD_PTLOCKS
|
|---|
| 1677 |
|
|---|
| 1678 | static struct page *pmd_to_page(pmd_t *pmd)
|
|---|
| 1679 | {
|
|---|
| 1680 | unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
|
|---|
| 1681 | return virt_to_page((void *)((unsigned long) pmd & mask));
|
|---|
| 1682 | }
|
|---|
| 1683 |
|
|---|
| 1684 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
|
|---|
| 1685 | {
|
|---|
| 1686 | return ptlock_ptr(pmd_to_page(pmd));
|
|---|
| 1687 | }
|
|---|
| 1688 |
|
|---|
| 1689 | static inline bool pgtable_pmd_page_ctor(struct page *page)
|
|---|
| 1690 | {
|
|---|
| 1691 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|---|
| 1692 | page->pmd_huge_pte = NULL;
|
|---|
| 1693 | #endif
|
|---|
| 1694 | return ptlock_init(page);
|
|---|
| 1695 | }
|
|---|
| 1696 |
|
|---|
| 1697 | static inline void pgtable_pmd_page_dtor(struct page *page)
|
|---|
| 1698 | {
|
|---|
| 1699 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|---|
| 1700 | VM_BUG_ON_PAGE(page->pmd_huge_pte, page);
|
|---|
| 1701 | #endif
|
|---|
| 1702 | ptlock_free(page);
|
|---|
| 1703 | }
|
|---|
| 1704 |
|
|---|
| 1705 | #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
|
|---|
| 1706 |
|
|---|
| 1707 | #else
|
|---|
| 1708 |
|
|---|
| 1709 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
|
|---|
| 1710 | {
|
|---|
| 1711 | return &mm->page_table_lock;
|
|---|
| 1712 | }
|
|---|
| 1713 |
|
|---|
| 1714 | static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; }
|
|---|
| 1715 | static inline void pgtable_pmd_page_dtor(struct page *page) {}
|
|---|
| 1716 |
|
|---|
| 1717 | #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
|
|---|
| 1718 |
|
|---|
| 1719 | #endif
|
|---|
| 1720 |
|
|---|
| 1721 | static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd)
|
|---|
| 1722 | {
|
|---|
| 1723 | spinlock_t *ptl = pmd_lockptr(mm, pmd);
|
|---|
| 1724 | spin_lock(ptl);
|
|---|
| 1725 | return ptl;
|
|---|
| 1726 | }
|
|---|
| 1727 |
|
|---|
| 1728 | extern void free_area_init(unsigned long * zones_size);
|
|---|
| 1729 | extern void free_area_init_node(int nid, unsigned long * zones_size,
|
|---|
| 1730 | unsigned long zone_start_pfn, unsigned long *zholes_size);
|
|---|
| 1731 | extern void free_initmem(void);
|
|---|
| 1732 |
|
|---|
| 1733 | /*
|
|---|
| 1734 | * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
|
|---|
| 1735 | * into the buddy system. The freed pages will be poisoned with pattern
|
|---|
| 1736 | * "poison" if it's within range [0, UCHAR_MAX].
|
|---|
| 1737 | * Return pages freed into the buddy system.
|
|---|
| 1738 | */
|
|---|
| 1739 | extern unsigned long free_reserved_area(void *start, void *end,
|
|---|
| 1740 | int poison, char *s);
|
|---|
| 1741 |
|
|---|
| 1742 | #ifdef CONFIG_HIGHMEM
|
|---|
| 1743 | /*
|
|---|
| 1744 | * Free a highmem page into the buddy system, adjusting totalhigh_pages
|
|---|
| 1745 | * and totalram_pages.
|
|---|
| 1746 | */
|
|---|
| 1747 | extern void free_highmem_page(struct page *page);
|
|---|
| 1748 | #endif
|
|---|
| 1749 |
|
|---|
| 1750 | extern void adjust_managed_page_count(struct page *page, long count);
|
|---|
| 1751 | extern void mem_init_print_info(const char *str);
|
|---|
| 1752 |
|
|---|
| 1753 | extern void reserve_bootmem_region(phys_addr_t start, phys_addr_t end);
|
|---|
| 1754 |
|
|---|
| 1755 | /* Free the reserved page into the buddy system, so it gets managed. */
|
|---|
| 1756 | static inline void __free_reserved_page(struct page *page)
|
|---|
| 1757 | {
|
|---|
| 1758 | ClearPageReserved(page);
|
|---|
| 1759 | init_page_count(page);
|
|---|
| 1760 | __free_page(page);
|
|---|
| 1761 | }
|
|---|
| 1762 |
|
|---|
| 1763 | static inline void free_reserved_page(struct page *page)
|
|---|
| 1764 | {
|
|---|
| 1765 | __free_reserved_page(page);
|
|---|
| 1766 | adjust_managed_page_count(page, 1);
|
|---|
| 1767 | }
|
|---|
| 1768 |
|
|---|
| 1769 | static inline void mark_page_reserved(struct page *page)
|
|---|
| 1770 | {
|
|---|
| 1771 | SetPageReserved(page);
|
|---|
| 1772 | adjust_managed_page_count(page, -1);
|
|---|
| 1773 | }
|
|---|
| 1774 |
|
|---|
| 1775 | /*
|
|---|
| 1776 | * Default method to free all the __init memory into the buddy system.
|
|---|
| 1777 | * The freed pages will be poisoned with pattern "poison" if it's within
|
|---|
| 1778 | * range [0, UCHAR_MAX].
|
|---|
| 1779 | * Return pages freed into the buddy system.
|
|---|
| 1780 | */
|
|---|
| 1781 | static inline unsigned long free_initmem_default(int poison)
|
|---|
| 1782 | {
|
|---|
| 1783 | extern char __init_begin[], __init_end[];
|
|---|
| 1784 |
|
|---|
| 1785 | return free_reserved_area(&__init_begin, &__init_end,
|
|---|
| 1786 | poison, "unused kernel");
|
|---|
| 1787 | }
|
|---|
| 1788 |
|
|---|
| 1789 | static inline unsigned long get_num_physpages(void)
|
|---|
| 1790 | {
|
|---|
| 1791 | int nid;
|
|---|
| 1792 | unsigned long phys_pages = 0;
|
|---|
| 1793 |
|
|---|
| 1794 | for_each_online_node(nid)
|
|---|
| 1795 | phys_pages += node_present_pages(nid);
|
|---|
| 1796 |
|
|---|
| 1797 | return phys_pages;
|
|---|
| 1798 | }
|
|---|
| 1799 |
|
|---|
| 1800 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
|
|---|
| 1801 | /*
|
|---|
| 1802 | * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
|
|---|
| 1803 | * zones, allocate the backing mem_map and account for memory holes in a more
|
|---|
| 1804 | * architecture independent manner. This is a substitute for creating the
|
|---|
| 1805 | * zone_sizes[] and zholes_size[] arrays and passing them to
|
|---|
| 1806 | * free_area_init_node()
|
|---|
| 1807 | *
|
|---|
| 1808 | * An architecture is expected to register range of page frames backed by
|
|---|
| 1809 | * physical memory with memblock_add[_node]() before calling
|
|---|
| 1810 | * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
|
|---|
| 1811 | * usage, an architecture is expected to do something like
|
|---|
| 1812 | *
|
|---|
| 1813 | * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
|
|---|
| 1814 | * max_highmem_pfn};
|
|---|
| 1815 | * for_each_valid_physical_page_range()
|
|---|
| 1816 | * memblock_add_node(base, size, nid)
|
|---|
| 1817 | * free_area_init_nodes(max_zone_pfns);
|
|---|
| 1818 | *
|
|---|
| 1819 | * free_bootmem_with_active_regions() calls free_bootmem_node() for each
|
|---|
| 1820 | * registered physical page range. Similarly
|
|---|
| 1821 | * sparse_memory_present_with_active_regions() calls memory_present() for
|
|---|
| 1822 | * each range when SPARSEMEM is enabled.
|
|---|
| 1823 | *
|
|---|
| 1824 | * See mm/page_alloc.c for more information on each function exposed by
|
|---|
| 1825 | * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
|
|---|
| 1826 | */
|
|---|
| 1827 | extern void free_area_init_nodes(unsigned long *max_zone_pfn);
|
|---|
| 1828 | unsigned long node_map_pfn_alignment(void);
|
|---|
| 1829 | unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn,
|
|---|
| 1830 | unsigned long end_pfn);
|
|---|
| 1831 | extern unsigned long absent_pages_in_range(unsigned long start_pfn,
|
|---|
| 1832 | unsigned long end_pfn);
|
|---|
| 1833 | extern void get_pfn_range_for_nid(unsigned int nid,
|
|---|
| 1834 | unsigned long *start_pfn, unsigned long *end_pfn);
|
|---|
| 1835 | extern unsigned long find_min_pfn_with_active_regions(void);
|
|---|
| 1836 | extern void free_bootmem_with_active_regions(int nid,
|
|---|
| 1837 | unsigned long max_low_pfn);
|
|---|
| 1838 | extern void sparse_memory_present_with_active_regions(int nid);
|
|---|
| 1839 |
|
|---|
| 1840 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
|
|---|
| 1841 |
|
|---|
| 1842 | #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
|
|---|
| 1843 | !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
|
|---|
| 1844 | static inline int __early_pfn_to_nid(unsigned long pfn,
|
|---|
| 1845 | struct mminit_pfnnid_cache *state)
|
|---|
| 1846 | {
|
|---|
| 1847 | return 0;
|
|---|
| 1848 | }
|
|---|
| 1849 | #else
|
|---|
| 1850 | /* please see mm/page_alloc.c */
|
|---|
| 1851 | extern int __meminit early_pfn_to_nid(unsigned long pfn);
|
|---|
| 1852 | /* there is a per-arch backend function. */
|
|---|
| 1853 | extern int __meminit __early_pfn_to_nid(unsigned long pfn,
|
|---|
| 1854 | struct mminit_pfnnid_cache *state);
|
|---|
| 1855 | #endif
|
|---|
| 1856 |
|
|---|
| 1857 | extern void set_dma_reserve(unsigned long new_dma_reserve);
|
|---|
| 1858 | extern void memmap_init_zone(unsigned long, int, unsigned long,
|
|---|
| 1859 | unsigned long, enum memmap_context);
|
|---|
| 1860 | extern void setup_per_zone_wmarks(void);
|
|---|
| 1861 | extern int __meminit init_per_zone_wmark_min(void);
|
|---|
| 1862 | extern void mem_init(void);
|
|---|
| 1863 | extern void __init mmap_init(void);
|
|---|
| 1864 | extern void show_mem(unsigned int flags);
|
|---|
| 1865 | extern long si_mem_available(void);
|
|---|
| 1866 | extern void si_meminfo(struct sysinfo * val);
|
|---|
| 1867 | extern void si_meminfo_node(struct sysinfo *val, int nid);
|
|---|
| 1868 | #ifdef __HAVE_ARCH_RESERVED_KERNEL_PAGES
|
|---|
| 1869 | extern unsigned long arch_reserved_kernel_pages(void);
|
|---|
| 1870 | #endif
|
|---|
| 1871 |
|
|---|
| 1872 | extern __printf(3, 4)
|
|---|
| 1873 | void warn_alloc_failed(gfp_t gfp_mask, unsigned int order,
|
|---|
| 1874 | const char *fmt, ...);
|
|---|
| 1875 |
|
|---|
| 1876 | extern void setup_per_cpu_pageset(void);
|
|---|
| 1877 |
|
|---|
| 1878 | extern void zone_pcp_update(struct zone *zone);
|
|---|
| 1879 | extern void zone_pcp_reset(struct zone *zone);
|
|---|
| 1880 |
|
|---|
| 1881 | /* page_alloc.c */
|
|---|
| 1882 | extern int min_free_kbytes;
|
|---|
| 1883 | extern int watermark_scale_factor;
|
|---|
| 1884 |
|
|---|
| 1885 | /* nommu.c */
|
|---|
| 1886 | extern atomic_long_t mmap_pages_allocated;
|
|---|
| 1887 | extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t);
|
|---|
| 1888 |
|
|---|
| 1889 | /* interval_tree.c */
|
|---|
| 1890 | void vma_interval_tree_insert(struct vm_area_struct *node,
|
|---|
| 1891 | struct rb_root *root);
|
|---|
| 1892 | void vma_interval_tree_insert_after(struct vm_area_struct *node,
|
|---|
| 1893 | struct vm_area_struct *prev,
|
|---|
| 1894 | struct rb_root *root);
|
|---|
| 1895 | void vma_interval_tree_remove(struct vm_area_struct *node,
|
|---|
| 1896 | struct rb_root *root);
|
|---|
| 1897 | struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root,
|
|---|
| 1898 | unsigned long start, unsigned long last);
|
|---|
| 1899 | struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node,
|
|---|
| 1900 | unsigned long start, unsigned long last);
|
|---|
| 1901 |
|
|---|
| 1902 | #define vma_interval_tree_foreach(vma, root, start, last) \
|
|---|
| 1903 | for (vma = vma_interval_tree_iter_first(root, start, last); \
|
|---|
| 1904 | vma; vma = vma_interval_tree_iter_next(vma, start, last))
|
|---|
| 1905 |
|
|---|
| 1906 | void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
|
|---|
| 1907 | struct rb_root *root);
|
|---|
| 1908 | void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
|
|---|
| 1909 | struct rb_root *root);
|
|---|
| 1910 | struct anon_vma_chain *anon_vma_interval_tree_iter_first(
|
|---|
| 1911 | struct rb_root *root, unsigned long start, unsigned long last);
|
|---|
| 1912 | struct anon_vma_chain *anon_vma_interval_tree_iter_next(
|
|---|
| 1913 | struct anon_vma_chain *node, unsigned long start, unsigned long last);
|
|---|
| 1914 | #ifdef CONFIG_DEBUG_VM_RB
|
|---|
| 1915 | void anon_vma_interval_tree_verify(struct anon_vma_chain *node);
|
|---|
| 1916 | #endif
|
|---|
| 1917 |
|
|---|
| 1918 | #define anon_vma_interval_tree_foreach(avc, root, start, last) \
|
|---|
| 1919 | for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
|
|---|
| 1920 | avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
|
|---|
| 1921 |
|
|---|
| 1922 | /* mmap.c */
|
|---|
| 1923 | extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
|
|---|
| 1924 | extern int vma_adjust(struct vm_area_struct *vma, unsigned long start,
|
|---|
| 1925 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
|
|---|
| 1926 | extern struct vm_area_struct *vma_merge(struct mm_struct *,
|
|---|
| 1927 | struct vm_area_struct *prev, unsigned long addr, unsigned long end,
|
|---|
| 1928 | unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
|
|---|
| 1929 | struct mempolicy *, struct vm_userfaultfd_ctx);
|
|---|
| 1930 | extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
|
|---|
| 1931 | extern int split_vma(struct mm_struct *,
|
|---|
| 1932 | struct vm_area_struct *, unsigned long addr, int new_below);
|
|---|
| 1933 | extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
|
|---|
| 1934 | extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
|
|---|
| 1935 | struct rb_node **, struct rb_node *);
|
|---|
| 1936 | extern void unlink_file_vma(struct vm_area_struct *);
|
|---|
| 1937 | extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
|
|---|
| 1938 | unsigned long addr, unsigned long len, pgoff_t pgoff,
|
|---|
| 1939 | bool *need_rmap_locks);
|
|---|
| 1940 | extern void exit_mmap(struct mm_struct *);
|
|---|
| 1941 |
|
|---|
| 1942 | static inline int check_data_rlimit(unsigned long rlim,
|
|---|
| 1943 | unsigned long new,
|
|---|
| 1944 | unsigned long start,
|
|---|
| 1945 | unsigned long end_data,
|
|---|
| 1946 | unsigned long start_data)
|
|---|
| 1947 | {
|
|---|
| 1948 | if (rlim < RLIM_INFINITY) {
|
|---|
| 1949 | if (((new - start) + (end_data - start_data)) > rlim)
|
|---|
| 1950 | return -ENOSPC;
|
|---|
| 1951 | }
|
|---|
| 1952 |
|
|---|
| 1953 | return 0;
|
|---|
| 1954 | }
|
|---|
| 1955 |
|
|---|
| 1956 | extern int mm_take_all_locks(struct mm_struct *mm);
|
|---|
| 1957 | extern void mm_drop_all_locks(struct mm_struct *mm);
|
|---|
| 1958 |
|
|---|
| 1959 | extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
|
|---|
| 1960 | extern struct file *get_mm_exe_file(struct mm_struct *mm);
|
|---|
| 1961 | extern struct file *get_task_exe_file(struct task_struct *task);
|
|---|
| 1962 |
|
|---|
| 1963 | extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
|
|---|
| 1964 | extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
|
|---|
| 1965 | unsigned long addr, unsigned long len,
|
|---|
| 1966 | unsigned long flags,
|
|---|
| 1967 | const struct vm_special_mapping *spec);
|
|---|
| 1968 | /* This is an obsolete alternative to _install_special_mapping. */
|
|---|
| 1969 | extern int install_special_mapping(struct mm_struct *mm,
|
|---|
| 1970 | unsigned long addr, unsigned long len,
|
|---|
| 1971 | unsigned long flags, struct page **pages);
|
|---|
| 1972 |
|
|---|
| 1973 | extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
|
|---|
| 1974 |
|
|---|
| 1975 | extern unsigned long mmap_region(struct file *file, unsigned long addr,
|
|---|
| 1976 | unsigned long len, vm_flags_t vm_flags, unsigned long pgoff);
|
|---|
| 1977 | extern unsigned long do_mmap(struct file *file, unsigned long addr,
|
|---|
| 1978 | unsigned long len, unsigned long prot, unsigned long flags,
|
|---|
| 1979 | vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate);
|
|---|
| 1980 | extern int do_munmap(struct mm_struct *, unsigned long, size_t);
|
|---|
| 1981 |
|
|---|
| 1982 | static inline unsigned long
|
|---|
| 1983 | do_mmap_pgoff(struct file *file, unsigned long addr,
|
|---|
| 1984 | unsigned long len, unsigned long prot, unsigned long flags,
|
|---|
| 1985 | unsigned long pgoff, unsigned long *populate)
|
|---|
| 1986 | {
|
|---|
| 1987 | return do_mmap(file, addr, len, prot, flags, 0, pgoff, populate);
|
|---|
| 1988 | }
|
|---|
| 1989 |
|
|---|
| 1990 | #ifdef CONFIG_MMU
|
|---|
| 1991 | extern int __mm_populate(unsigned long addr, unsigned long len,
|
|---|
| 1992 | int ignore_errors);
|
|---|
| 1993 | static inline void mm_populate(unsigned long addr, unsigned long len)
|
|---|
| 1994 | {
|
|---|
| 1995 | /* Ignore errors */
|
|---|
| 1996 | (void) __mm_populate(addr, len, 1);
|
|---|
| 1997 | }
|
|---|
| 1998 | #else
|
|---|
| 1999 | static inline void mm_populate(unsigned long addr, unsigned long len) {}
|
|---|
| 2000 | #endif
|
|---|
| 2001 |
|
|---|
| 2002 | /* These take the mm semaphore themselves */
|
|---|
| 2003 | extern unsigned long vm_brk(unsigned long, unsigned long);
|
|---|
| 2004 | extern int vm_munmap(unsigned long, size_t);
|
|---|
| 2005 | extern unsigned long vm_mmap(struct file *, unsigned long,
|
|---|
| 2006 | unsigned long, unsigned long,
|
|---|
| 2007 | unsigned long, unsigned long);
|
|---|
| 2008 |
|
|---|
| 2009 | struct vm_unmapped_area_info {
|
|---|
| 2010 | #define VM_UNMAPPED_AREA_TOPDOWN 1
|
|---|
| 2011 | unsigned long flags;
|
|---|
| 2012 | unsigned long length;
|
|---|
| 2013 | unsigned long low_limit;
|
|---|
| 2014 | unsigned long high_limit;
|
|---|
| 2015 | unsigned long align_mask;
|
|---|
| 2016 | unsigned long align_offset;
|
|---|
| 2017 | };
|
|---|
| 2018 |
|
|---|
| 2019 | extern unsigned long unmapped_area(struct vm_unmapped_area_info *info);
|
|---|
| 2020 | extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info);
|
|---|
| 2021 |
|
|---|
| 2022 | /*
|
|---|
| 2023 | * Search for an unmapped address range.
|
|---|
| 2024 | *
|
|---|
| 2025 | * We are looking for a range that:
|
|---|
| 2026 | * - does not intersect with any VMA;
|
|---|
| 2027 | * - is contained within the [low_limit, high_limit) interval;
|
|---|
| 2028 | * - is at least the desired size.
|
|---|
| 2029 | * - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
|
|---|
| 2030 | */
|
|---|
| 2031 | static inline unsigned long
|
|---|
| 2032 | vm_unmapped_area(struct vm_unmapped_area_info *info)
|
|---|
| 2033 | {
|
|---|
| 2034 | if (info->flags & VM_UNMAPPED_AREA_TOPDOWN)
|
|---|
| 2035 | return unmapped_area_topdown(info);
|
|---|
| 2036 | else
|
|---|
| 2037 | return unmapped_area(info);
|
|---|
| 2038 | }
|
|---|
| 2039 |
|
|---|
| 2040 | /* truncate.c */
|
|---|
| 2041 | extern void truncate_inode_pages(struct address_space *, loff_t);
|
|---|
| 2042 | extern void truncate_inode_pages_range(struct address_space *,
|
|---|
| 2043 | loff_t lstart, loff_t lend);
|
|---|
| 2044 | extern void truncate_inode_pages_final(struct address_space *);
|
|---|
| 2045 |
|
|---|
| 2046 | /* generic vm_area_ops exported for stackable file systems */
|
|---|
| 2047 | extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
|
|---|
| 2048 | extern void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf);
|
|---|
| 2049 | extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
|
|---|
| 2050 |
|
|---|
| 2051 | /* mm/page-writeback.c */
|
|---|
| 2052 | int write_one_page(struct page *page, int wait);
|
|---|
| 2053 | void task_dirty_inc(struct task_struct *tsk);
|
|---|
| 2054 |
|
|---|
| 2055 | /* readahead.c */
|
|---|
| 2056 | #define VM_MAX_READAHEAD 512 /* kbytes */
|
|---|
| 2057 | #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
|
|---|
| 2058 |
|
|---|
| 2059 | int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
|
|---|
| 2060 | pgoff_t offset, unsigned long nr_to_read);
|
|---|
| 2061 |
|
|---|
| 2062 | void page_cache_sync_readahead(struct address_space *mapping,
|
|---|
| 2063 | struct file_ra_state *ra,
|
|---|
| 2064 | struct file *filp,
|
|---|
| 2065 | pgoff_t offset,
|
|---|
| 2066 | unsigned long size);
|
|---|
| 2067 |
|
|---|
| 2068 | void page_cache_async_readahead(struct address_space *mapping,
|
|---|
| 2069 | struct file_ra_state *ra,
|
|---|
| 2070 | struct file *filp,
|
|---|
| 2071 | struct page *pg,
|
|---|
| 2072 | pgoff_t offset,
|
|---|
| 2073 | unsigned long size);
|
|---|
| 2074 |
|
|---|
| 2075 | extern unsigned long stack_guard_gap;
|
|---|
| 2076 | /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
|
|---|
| 2077 | extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
|
|---|
| 2078 |
|
|---|
| 2079 | /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
|
|---|
| 2080 | extern int expand_downwards(struct vm_area_struct *vma,
|
|---|
| 2081 | unsigned long address);
|
|---|
| 2082 | #if VM_GROWSUP
|
|---|
| 2083 | extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
|
|---|
| 2084 | #else
|
|---|
| 2085 | #define expand_upwards(vma, address) (0)
|
|---|
| 2086 | #endif
|
|---|
| 2087 |
|
|---|
| 2088 | /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
|
|---|
| 2089 | extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
|
|---|
| 2090 | extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
|
|---|
| 2091 | struct vm_area_struct **pprev);
|
|---|
| 2092 |
|
|---|
| 2093 | /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
|
|---|
| 2094 | NULL if none. Assume start_addr < end_addr. */
|
|---|
| 2095 | static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
|
|---|
| 2096 | {
|
|---|
| 2097 | struct vm_area_struct * vma = find_vma(mm,start_addr);
|
|---|
| 2098 |
|
|---|
| 2099 | if (vma && end_addr <= vma->vm_start)
|
|---|
| 2100 | vma = NULL;
|
|---|
| 2101 | return vma;
|
|---|
| 2102 | }
|
|---|
| 2103 |
|
|---|
| 2104 | static inline unsigned long vm_start_gap(struct vm_area_struct *vma)
|
|---|
| 2105 | {
|
|---|
| 2106 | unsigned long vm_start = vma->vm_start;
|
|---|
| 2107 |
|
|---|
| 2108 | if (vma->vm_flags & VM_GROWSDOWN) {
|
|---|
| 2109 | vm_start -= stack_guard_gap;
|
|---|
| 2110 | if (vm_start > vma->vm_start)
|
|---|
| 2111 | vm_start = 0;
|
|---|
| 2112 | }
|
|---|
| 2113 | return vm_start;
|
|---|
| 2114 | }
|
|---|
| 2115 |
|
|---|
| 2116 | static inline unsigned long vm_end_gap(struct vm_area_struct *vma)
|
|---|
| 2117 | {
|
|---|
| 2118 | unsigned long vm_end = vma->vm_end;
|
|---|
| 2119 |
|
|---|
| 2120 | if (vma->vm_flags & VM_GROWSUP) {
|
|---|
| 2121 | vm_end += stack_guard_gap;
|
|---|
| 2122 | if (vm_end < vma->vm_end)
|
|---|
| 2123 | vm_end = -PAGE_SIZE;
|
|---|
| 2124 | }
|
|---|
| 2125 | return vm_end;
|
|---|
| 2126 | }
|
|---|
| 2127 |
|
|---|
| 2128 | static inline unsigned long vma_pages(struct vm_area_struct *vma)
|
|---|
| 2129 | {
|
|---|
| 2130 | return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
|
|---|
| 2131 | }
|
|---|
| 2132 |
|
|---|
| 2133 | /* Look up the first VMA which exactly match the interval vm_start ... vm_end */
|
|---|
| 2134 | static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
|
|---|
| 2135 | unsigned long vm_start, unsigned long vm_end)
|
|---|
| 2136 | {
|
|---|
| 2137 | struct vm_area_struct *vma = find_vma(mm, vm_start);
|
|---|
| 2138 |
|
|---|
| 2139 | if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end))
|
|---|
| 2140 | vma = NULL;
|
|---|
| 2141 |
|
|---|
| 2142 | return vma;
|
|---|
| 2143 | }
|
|---|
| 2144 |
|
|---|
| 2145 | #ifdef CONFIG_MMU
|
|---|
| 2146 | pgprot_t vm_get_page_prot(unsigned long vm_flags);
|
|---|
| 2147 | void vma_set_page_prot(struct vm_area_struct *vma);
|
|---|
| 2148 | #else
|
|---|
| 2149 | static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
|
|---|
| 2150 | {
|
|---|
| 2151 | return __pgprot(0);
|
|---|
| 2152 | }
|
|---|
| 2153 | static inline void vma_set_page_prot(struct vm_area_struct *vma)
|
|---|
| 2154 | {
|
|---|
| 2155 | vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
|
|---|
| 2156 | }
|
|---|
| 2157 | #endif
|
|---|
| 2158 |
|
|---|
| 2159 | #ifdef CONFIG_NUMA_BALANCING
|
|---|
| 2160 | unsigned long change_prot_numa(struct vm_area_struct *vma,
|
|---|
| 2161 | unsigned long start, unsigned long end);
|
|---|
| 2162 | #endif
|
|---|
| 2163 |
|
|---|
| 2164 | struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
|
|---|
| 2165 | int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
|
|---|
| 2166 | unsigned long pfn, unsigned long size, pgprot_t);
|
|---|
| 2167 | int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
|
|---|
| 2168 | int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
|
|---|
| 2169 | unsigned long pfn);
|
|---|
| 2170 | int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
|
|---|
| 2171 | pfn_t pfn);
|
|---|
| 2172 | int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len);
|
|---|
| 2173 |
|
|---|
| 2174 |
|
|---|
| 2175 | struct page *follow_page_mask(struct vm_area_struct *vma,
|
|---|
| 2176 | unsigned long address, unsigned int foll_flags,
|
|---|
| 2177 | unsigned int *page_mask);
|
|---|
| 2178 |
|
|---|
| 2179 | static inline struct page *follow_page(struct vm_area_struct *vma,
|
|---|
| 2180 | unsigned long address, unsigned int foll_flags)
|
|---|
| 2181 | {
|
|---|
| 2182 | unsigned int unused_page_mask;
|
|---|
| 2183 | return follow_page_mask(vma, address, foll_flags, &unused_page_mask);
|
|---|
| 2184 | }
|
|---|
| 2185 |
|
|---|
| 2186 | #define FOLL_WRITE 0x01 /* check pte is writable */
|
|---|
| 2187 | #define FOLL_TOUCH 0x02 /* mark page accessed */
|
|---|
| 2188 | #define FOLL_GET 0x04 /* do get_page on page */
|
|---|
| 2189 | #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
|
|---|
| 2190 | #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
|
|---|
| 2191 | #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
|
|---|
| 2192 | * and return without waiting upon it */
|
|---|
| 2193 | #define FOLL_POPULATE 0x40 /* fault in page */
|
|---|
| 2194 | #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
|
|---|
| 2195 | #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
|
|---|
| 2196 | #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
|
|---|
| 2197 | #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
|
|---|
| 2198 | #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
|
|---|
| 2199 | #define FOLL_MLOCK 0x1000 /* lock present pages */
|
|---|
| 2200 | #define FOLL_REMOTE 0x2000 /* we are working on non-current tsk/mm */
|
|---|
| 2201 | #define FOLL_COW 0x4000 /* internal GUP flag */
|
|---|
| 2202 |
|
|---|
| 2203 | typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
|
|---|
| 2204 | void *data);
|
|---|
| 2205 | extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
|
|---|
| 2206 | unsigned long size, pte_fn_t fn, void *data);
|
|---|
| 2207 |
|
|---|
| 2208 | #ifdef CONFIG_PROC_FS
|
|---|
| 2209 | void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
|
|---|
| 2210 | #else
|
|---|
| 2211 | static inline void vm_stat_account(struct mm_struct *mm,
|
|---|
| 2212 | unsigned long flags, struct file *file, long pages)
|
|---|
| 2213 | {
|
|---|
| 2214 | mm->total_vm += pages;
|
|---|
| 2215 | }
|
|---|
| 2216 | #endif /* CONFIG_PROC_FS */
|
|---|
| 2217 |
|
|---|
| 2218 | #ifdef CONFIG_DEBUG_PAGEALLOC
|
|---|
| 2219 | extern bool _debug_pagealloc_enabled;
|
|---|
| 2220 | extern void __kernel_map_pages(struct page *page, int numpages, int enable);
|
|---|
| 2221 |
|
|---|
| 2222 | static inline bool debug_pagealloc_enabled(void)
|
|---|
| 2223 | {
|
|---|
| 2224 | return _debug_pagealloc_enabled;
|
|---|
| 2225 | }
|
|---|
| 2226 |
|
|---|
| 2227 | static inline void
|
|---|
| 2228 | kernel_map_pages(struct page *page, int numpages, int enable)
|
|---|
| 2229 | {
|
|---|
| 2230 | if (!debug_pagealloc_enabled())
|
|---|
| 2231 | return;
|
|---|
| 2232 |
|
|---|
| 2233 | __kernel_map_pages(page, numpages, enable);
|
|---|
| 2234 | }
|
|---|
| 2235 | #ifdef CONFIG_HIBERNATION
|
|---|
| 2236 | extern bool kernel_page_present(struct page *page);
|
|---|
| 2237 | #endif /* CONFIG_HIBERNATION */
|
|---|
| 2238 | #else /* CONFIG_DEBUG_PAGEALLOC */
|
|---|
| 2239 | static inline void
|
|---|
| 2240 | kernel_map_pages(struct page *page, int numpages, int enable) {}
|
|---|
| 2241 | #ifdef CONFIG_HIBERNATION
|
|---|
| 2242 | static inline bool kernel_page_present(struct page *page) { return true; }
|
|---|
| 2243 | #endif /* CONFIG_HIBERNATION */
|
|---|
| 2244 | static inline bool debug_pagealloc_enabled(void)
|
|---|
| 2245 | {
|
|---|
| 2246 | return false;
|
|---|
| 2247 | }
|
|---|
| 2248 | #endif /* CONFIG_DEBUG_PAGEALLOC */
|
|---|
| 2249 |
|
|---|
| 2250 | #ifdef __HAVE_ARCH_GATE_AREA
|
|---|
| 2251 | extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
|
|---|
| 2252 | extern int in_gate_area_no_mm(unsigned long addr);
|
|---|
| 2253 | extern int in_gate_area(struct mm_struct *mm, unsigned long addr);
|
|---|
| 2254 | #else
|
|---|
| 2255 | static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
|
|---|
| 2256 | {
|
|---|
| 2257 | return NULL;
|
|---|
| 2258 | }
|
|---|
| 2259 | static inline int in_gate_area_no_mm(unsigned long addr) { return 0; }
|
|---|
| 2260 | static inline int in_gate_area(struct mm_struct *mm, unsigned long addr)
|
|---|
| 2261 | {
|
|---|
| 2262 | return 0;
|
|---|
| 2263 | }
|
|---|
| 2264 | #endif /* __HAVE_ARCH_GATE_AREA */
|
|---|
| 2265 |
|
|---|
| 2266 | #ifdef CONFIG_SYSCTL
|
|---|
| 2267 | extern int sysctl_drop_caches;
|
|---|
| 2268 | int drop_caches_sysctl_handler(struct ctl_table *, int,
|
|---|
| 2269 | void __user *, size_t *, loff_t *);
|
|---|
| 2270 | #endif
|
|---|
| 2271 |
|
|---|
| 2272 | void drop_slab(void);
|
|---|
| 2273 | void drop_slab_node(int nid);
|
|---|
| 2274 |
|
|---|
| 2275 | #ifndef CONFIG_MMU
|
|---|
| 2276 | #define randomize_va_space 0
|
|---|
| 2277 | #else
|
|---|
| 2278 | extern int randomize_va_space;
|
|---|
| 2279 | #endif
|
|---|
| 2280 |
|
|---|
| 2281 | const char * arch_vma_name(struct vm_area_struct *vma);
|
|---|
| 2282 | void print_vma_addr(char *prefix, unsigned long rip);
|
|---|
| 2283 |
|
|---|
| 2284 | void sparse_mem_maps_populate_node(struct page **map_map,
|
|---|
| 2285 | unsigned long pnum_begin,
|
|---|
| 2286 | unsigned long pnum_end,
|
|---|
| 2287 | unsigned long map_count,
|
|---|
| 2288 | int nodeid);
|
|---|
| 2289 |
|
|---|
| 2290 | struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
|
|---|
| 2291 | pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
|
|---|
| 2292 | pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
|
|---|
| 2293 | pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
|
|---|
| 2294 | pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
|
|---|
| 2295 | void *vmemmap_alloc_block(unsigned long size, int node);
|
|---|
| 2296 | struct vmem_altmap;
|
|---|
| 2297 | void *__vmemmap_alloc_block_buf(unsigned long size, int node,
|
|---|
| 2298 | struct vmem_altmap *altmap);
|
|---|
| 2299 | static inline void *vmemmap_alloc_block_buf(unsigned long size, int node)
|
|---|
| 2300 | {
|
|---|
| 2301 | return __vmemmap_alloc_block_buf(size, node, NULL);
|
|---|
| 2302 | }
|
|---|
| 2303 |
|
|---|
| 2304 | void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
|
|---|
| 2305 | int vmemmap_populate_basepages(unsigned long start, unsigned long end,
|
|---|
| 2306 | int node);
|
|---|
| 2307 | int vmemmap_populate(unsigned long start, unsigned long end, int node);
|
|---|
| 2308 | void vmemmap_populate_print_last(void);
|
|---|
| 2309 | #ifdef CONFIG_MEMORY_HOTPLUG
|
|---|
| 2310 | void vmemmap_free(unsigned long start, unsigned long end);
|
|---|
| 2311 | #endif
|
|---|
| 2312 | void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
|
|---|
| 2313 | unsigned long size);
|
|---|
| 2314 |
|
|---|
| 2315 | enum mf_flags {
|
|---|
| 2316 | MF_COUNT_INCREASED = 1 << 0,
|
|---|
| 2317 | MF_ACTION_REQUIRED = 1 << 1,
|
|---|
| 2318 | MF_MUST_KILL = 1 << 2,
|
|---|
| 2319 | MF_SOFT_OFFLINE = 1 << 3,
|
|---|
| 2320 | };
|
|---|
| 2321 | extern int memory_failure(unsigned long pfn, int trapno, int flags);
|
|---|
| 2322 | extern void memory_failure_queue(unsigned long pfn, int trapno, int flags);
|
|---|
| 2323 | extern int unpoison_memory(unsigned long pfn);
|
|---|
| 2324 | extern int get_hwpoison_page(struct page *page);
|
|---|
| 2325 | extern void put_hwpoison_page(struct page *page);
|
|---|
| 2326 | extern int sysctl_memory_failure_early_kill;
|
|---|
| 2327 | extern int sysctl_memory_failure_recovery;
|
|---|
| 2328 | extern void shake_page(struct page *p, int access);
|
|---|
| 2329 | extern atomic_long_t num_poisoned_pages;
|
|---|
| 2330 | extern int soft_offline_page(struct page *page, int flags);
|
|---|
| 2331 |
|
|---|
| 2332 |
|
|---|
| 2333 | /*
|
|---|
| 2334 | * Error handlers for various types of pages.
|
|---|
| 2335 | */
|
|---|
| 2336 | enum mf_result {
|
|---|
| 2337 | MF_IGNORED, /* Error: cannot be handled */
|
|---|
| 2338 | MF_FAILED, /* Error: handling failed */
|
|---|
| 2339 | MF_DELAYED, /* Will be handled later */
|
|---|
| 2340 | MF_RECOVERED, /* Successfully recovered */
|
|---|
| 2341 | };
|
|---|
| 2342 |
|
|---|
| 2343 | enum mf_action_page_type {
|
|---|
| 2344 | MF_MSG_KERNEL,
|
|---|
| 2345 | MF_MSG_KERNEL_HIGH_ORDER,
|
|---|
| 2346 | MF_MSG_SLAB,
|
|---|
| 2347 | MF_MSG_DIFFERENT_COMPOUND,
|
|---|
| 2348 | MF_MSG_POISONED_HUGE,
|
|---|
| 2349 | MF_MSG_HUGE,
|
|---|
| 2350 | MF_MSG_FREE_HUGE,
|
|---|
| 2351 | MF_MSG_UNMAP_FAILED,
|
|---|
| 2352 | MF_MSG_DIRTY_SWAPCACHE,
|
|---|
| 2353 | MF_MSG_CLEAN_SWAPCACHE,
|
|---|
| 2354 | MF_MSG_DIRTY_MLOCKED_LRU,
|
|---|
| 2355 | MF_MSG_CLEAN_MLOCKED_LRU,
|
|---|
| 2356 | MF_MSG_DIRTY_UNEVICTABLE_LRU,
|
|---|
| 2357 | MF_MSG_CLEAN_UNEVICTABLE_LRU,
|
|---|
| 2358 | MF_MSG_DIRTY_LRU,
|
|---|
| 2359 | MF_MSG_CLEAN_LRU,
|
|---|
| 2360 | MF_MSG_TRUNCATED_LRU,
|
|---|
| 2361 | MF_MSG_BUDDY,
|
|---|
| 2362 | MF_MSG_BUDDY_2ND,
|
|---|
| 2363 | MF_MSG_UNKNOWN,
|
|---|
| 2364 | };
|
|---|
| 2365 |
|
|---|
| 2366 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
|
|---|
| 2367 | extern void clear_huge_page(struct page *page,
|
|---|
| 2368 | unsigned long addr,
|
|---|
| 2369 | unsigned int pages_per_huge_page);
|
|---|
| 2370 | extern void copy_user_huge_page(struct page *dst, struct page *src,
|
|---|
| 2371 | unsigned long addr, struct vm_area_struct *vma,
|
|---|
| 2372 | unsigned int pages_per_huge_page);
|
|---|
| 2373 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
|
|---|
| 2374 |
|
|---|
| 2375 | extern struct page_ext_operations debug_guardpage_ops;
|
|---|
| 2376 | extern struct page_ext_operations page_poisoning_ops;
|
|---|
| 2377 |
|
|---|
| 2378 | #ifdef CONFIG_DEBUG_PAGEALLOC
|
|---|
| 2379 | extern unsigned int _debug_guardpage_minorder;
|
|---|
| 2380 | extern bool _debug_guardpage_enabled;
|
|---|
| 2381 |
|
|---|
| 2382 | static inline unsigned int debug_guardpage_minorder(void)
|
|---|
| 2383 | {
|
|---|
| 2384 | return _debug_guardpage_minorder;
|
|---|
| 2385 | }
|
|---|
| 2386 |
|
|---|
| 2387 | static inline bool debug_guardpage_enabled(void)
|
|---|
| 2388 | {
|
|---|
| 2389 | return _debug_guardpage_enabled;
|
|---|
| 2390 | }
|
|---|
| 2391 |
|
|---|
| 2392 | static inline bool page_is_guard(struct page *page)
|
|---|
| 2393 | {
|
|---|
| 2394 | struct page_ext *page_ext;
|
|---|
| 2395 |
|
|---|
| 2396 | if (!debug_guardpage_enabled())
|
|---|
| 2397 | return false;
|
|---|
| 2398 |
|
|---|
| 2399 | page_ext = lookup_page_ext(page);
|
|---|
| 2400 | return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags);
|
|---|
| 2401 | }
|
|---|
| 2402 | #else
|
|---|
| 2403 | static inline unsigned int debug_guardpage_minorder(void) { return 0; }
|
|---|
| 2404 | static inline bool debug_guardpage_enabled(void) { return false; }
|
|---|
| 2405 | static inline bool page_is_guard(struct page *page) { return false; }
|
|---|
| 2406 | #endif /* CONFIG_DEBUG_PAGEALLOC */
|
|---|
| 2407 |
|
|---|
| 2408 | #if MAX_NUMNODES > 1
|
|---|
| 2409 | void __init setup_nr_node_ids(void);
|
|---|
| 2410 | #else
|
|---|
| 2411 | static inline void setup_nr_node_ids(void) {}
|
|---|
| 2412 | #endif
|
|---|
| 2413 |
|
|---|
| 2414 | #endif /* __KERNEL__ */
|
|---|
| 2415 | #endif /* _LINUX_MM_H */
|
|---|