linux/include/linux/huge_mm.h
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   1#ifndef _LINUX_HUGE_MM_H
   2#define _LINUX_HUGE_MM_H
   3
   4extern int do_huge_pmd_anonymous_page(struct mm_struct *mm,
   5                                      struct vm_area_struct *vma,
   6                                      unsigned long address, pmd_t *pmd,
   7                                      unsigned int flags);
   8extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
   9                         pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
  10                         struct vm_area_struct *vma);
  11extern int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
  12                               unsigned long address, pmd_t *pmd,
  13                               pmd_t orig_pmd);
  14extern pgtable_t get_pmd_huge_pte(struct mm_struct *mm);
  15extern struct page *follow_trans_huge_pmd(struct mm_struct *mm,
  16                                          unsigned long addr,
  17                                          pmd_t *pmd,
  18                                          unsigned int flags);
  19extern int zap_huge_pmd(struct mmu_gather *tlb,
  20                        struct vm_area_struct *vma,
  21                        pmd_t *pmd, unsigned long addr);
  22extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
  23                        unsigned long addr, unsigned long end,
  24                        unsigned char *vec);
  25extern int move_huge_pmd(struct vm_area_struct *vma,
  26                         struct vm_area_struct *new_vma,
  27                         unsigned long old_addr,
  28                         unsigned long new_addr, unsigned long old_end,
  29                         pmd_t *old_pmd, pmd_t *new_pmd);
  30extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
  31                        unsigned long addr, pgprot_t newprot);
  32
  33enum transparent_hugepage_flag {
  34        TRANSPARENT_HUGEPAGE_FLAG,
  35        TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
  36        TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
  37        TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
  38        TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
  39#ifdef CONFIG_DEBUG_VM
  40        TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
  41#endif
  42};
  43
  44enum page_check_address_pmd_flag {
  45        PAGE_CHECK_ADDRESS_PMD_FLAG,
  46        PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
  47        PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
  48};
  49extern pmd_t *page_check_address_pmd(struct page *page,
  50                                     struct mm_struct *mm,
  51                                     unsigned long address,
  52                                     enum page_check_address_pmd_flag flag);
  53
  54#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
  55#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
  56
  57#ifdef CONFIG_TRANSPARENT_HUGEPAGE
  58#define HPAGE_PMD_SHIFT HPAGE_SHIFT
  59#define HPAGE_PMD_MASK HPAGE_MASK
  60#define HPAGE_PMD_SIZE HPAGE_SIZE
  61
  62extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
  63
  64#define transparent_hugepage_enabled(__vma)                             \
  65        ((transparent_hugepage_flags &                                  \
  66          (1<<TRANSPARENT_HUGEPAGE_FLAG) ||                             \
  67          (transparent_hugepage_flags &                                 \
  68           (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) &&                   \
  69           ((__vma)->vm_flags & VM_HUGEPAGE))) &&                       \
  70         !((__vma)->vm_flags & VM_NOHUGEPAGE) &&                        \
  71         !is_vma_temporary_stack(__vma))
  72#define transparent_hugepage_defrag(__vma)                              \
  73        ((transparent_hugepage_flags &                                  \
  74          (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) ||                     \
  75         (transparent_hugepage_flags &                                  \
  76          (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) &&             \
  77          (__vma)->vm_flags & VM_HUGEPAGE))
  78#ifdef CONFIG_DEBUG_VM
  79#define transparent_hugepage_debug_cow()                                \
  80        (transparent_hugepage_flags &                                   \
  81         (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
  82#else /* CONFIG_DEBUG_VM */
  83#define transparent_hugepage_debug_cow() 0
  84#endif /* CONFIG_DEBUG_VM */
  85
  86extern unsigned long transparent_hugepage_flags;
  87extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
  88                          pmd_t *dst_pmd, pmd_t *src_pmd,
  89                          struct vm_area_struct *vma,
  90                          unsigned long addr, unsigned long end);
  91extern int handle_pte_fault(struct mm_struct *mm,
  92                            struct vm_area_struct *vma, unsigned long address,
  93                            pte_t *pte, pmd_t *pmd, unsigned int flags);
  94extern int split_huge_page(struct page *page);
  95extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
  96#define split_huge_page_pmd(__mm, __pmd)                                \
  97        do {                                                            \
  98                pmd_t *____pmd = (__pmd);                               \
  99                if (unlikely(pmd_trans_huge(*____pmd)))                 \
 100                        __split_huge_page_pmd(__mm, ____pmd);           \
 101        }  while (0)
 102#define wait_split_huge_page(__anon_vma, __pmd)                         \
 103        do {                                                            \
 104                pmd_t *____pmd = (__pmd);                               \
 105                anon_vma_lock(__anon_vma);                              \
 106                anon_vma_unlock(__anon_vma);                            \
 107                BUG_ON(pmd_trans_splitting(*____pmd) ||                 \
 108                       pmd_trans_huge(*____pmd));                       \
 109        } while (0)
 110#if HPAGE_PMD_ORDER > MAX_ORDER
 111#error "hugepages can't be allocated by the buddy allocator"
 112#endif
 113extern int hugepage_madvise(struct vm_area_struct *vma,
 114                            unsigned long *vm_flags, int advice);
 115extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
 116                                    unsigned long start,
 117                                    unsigned long end,
 118                                    long adjust_next);
 119extern int __pmd_trans_huge_lock(pmd_t *pmd,
 120                                 struct vm_area_struct *vma);
 121/* mmap_sem must be held on entry */
 122static inline int pmd_trans_huge_lock(pmd_t *pmd,
 123                                      struct vm_area_struct *vma)
 124{
 125        VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
 126        if (pmd_trans_huge(*pmd))
 127                return __pmd_trans_huge_lock(pmd, vma);
 128        else
 129                return 0;
 130}
 131static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
 132                                         unsigned long start,
 133                                         unsigned long end,
 134                                         long adjust_next)
 135{
 136        if (!vma->anon_vma || vma->vm_ops)
 137                return;
 138        __vma_adjust_trans_huge(vma, start, end, adjust_next);
 139}
 140static inline int hpage_nr_pages(struct page *page)
 141{
 142        if (unlikely(PageTransHuge(page)))
 143                return HPAGE_PMD_NR;
 144        return 1;
 145}
 146static inline struct page *compound_trans_head(struct page *page)
 147{
 148        if (PageTail(page)) {
 149                struct page *head;
 150                head = page->first_page;
 151                smp_rmb();
 152                /*
 153                 * head may be a dangling pointer.
 154                 * __split_huge_page_refcount clears PageTail before
 155                 * overwriting first_page, so if PageTail is still
 156                 * there it means the head pointer isn't dangling.
 157                 */
 158                if (PageTail(page))
 159                        return head;
 160        }
 161        return page;
 162}
 163#else /* CONFIG_TRANSPARENT_HUGEPAGE */
 164#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
 165#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
 166#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
 167
 168#define hpage_nr_pages(x) 1
 169
 170#define transparent_hugepage_enabled(__vma) 0
 171
 172#define transparent_hugepage_flags 0UL
 173static inline int split_huge_page(struct page *page)
 174{
 175        return 0;
 176}
 177#define split_huge_page_pmd(__mm, __pmd)        \
 178        do { } while (0)
 179#define wait_split_huge_page(__anon_vma, __pmd) \
 180        do { } while (0)
 181#define compound_trans_head(page) compound_head(page)
 182static inline int hugepage_madvise(struct vm_area_struct *vma,
 183                                   unsigned long *vm_flags, int advice)
 184{
 185        BUG();
 186        return 0;
 187}
 188static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
 189                                         unsigned long start,
 190                                         unsigned long end,
 191                                         long adjust_next)
 192{
 193}
 194static inline int pmd_trans_huge_lock(pmd_t *pmd,
 195                                      struct vm_area_struct *vma)
 196{
 197        return 0;
 198}
 199#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 200
 201#endif /* _LINUX_HUGE_MM_H */
 202
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