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- #ifndef _LINUX_HUGE_MM_H
- #define _LINUX_HUGE_MM_H
- extern int do_huge_pmd_anonymous_page(struct mm_struct *mm,
- struct vm_area_struct *vma,
- unsigned long address, pmd_t *pmd,
- unsigned int flags);
- extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
- pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
- struct vm_area_struct *vma);
- extern int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, pmd_t *pmd,
- pmd_t orig_pmd);
- extern pgtable_t get_pmd_huge_pte(struct mm_struct *mm);
- extern struct page *follow_trans_huge_pmd(struct mm_struct *mm,
- unsigned long addr,
- pmd_t *pmd,
- unsigned int flags);
- extern int zap_huge_pmd(struct mmu_gather *tlb,
- struct vm_area_struct *vma,
- pmd_t *pmd);
- extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
- unsigned long addr, unsigned long end,
- unsigned char *vec);
- extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
- unsigned long addr, pgprot_t newprot);
- enum transparent_hugepage_flag {
- TRANSPARENT_HUGEPAGE_FLAG,
- TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
- TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
- TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
- TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
- #ifdef CONFIG_DEBUG_VM
- TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
- #endif
- };
- enum page_check_address_pmd_flag {
- PAGE_CHECK_ADDRESS_PMD_FLAG,
- PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
- PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
- };
- extern pmd_t *page_check_address_pmd(struct page *page,
- struct mm_struct *mm,
- unsigned long address,
- enum page_check_address_pmd_flag flag);
- #ifdef CONFIG_TRANSPARENT_HUGEPAGE
- #define HPAGE_PMD_SHIFT HPAGE_SHIFT
- #define HPAGE_PMD_MASK HPAGE_MASK
- #define HPAGE_PMD_SIZE HPAGE_SIZE
- #define transparent_hugepage_enabled(__vma) \
- (transparent_hugepage_flags & (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
- (transparent_hugepage_flags & \
- (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
- (__vma)->vm_flags & VM_HUGEPAGE))
- #define transparent_hugepage_defrag(__vma) \
- ((transparent_hugepage_flags & \
- (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
- (transparent_hugepage_flags & \
- (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
- (__vma)->vm_flags & VM_HUGEPAGE))
- #ifdef CONFIG_DEBUG_VM
- #define transparent_hugepage_debug_cow() \
- (transparent_hugepage_flags & \
- (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
- #else /* CONFIG_DEBUG_VM */
- #define transparent_hugepage_debug_cow() 0
- #endif /* CONFIG_DEBUG_VM */
- extern unsigned long transparent_hugepage_flags;
- extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
- pmd_t *dst_pmd, pmd_t *src_pmd,
- struct vm_area_struct *vma,
- unsigned long addr, unsigned long end);
- extern int handle_pte_fault(struct mm_struct *mm,
- struct vm_area_struct *vma, unsigned long address,
- pte_t *pte, pmd_t *pmd, unsigned int flags);
- extern int split_huge_page(struct page *page);
- extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
- #define split_huge_page_pmd(__mm, __pmd) \
- do { \
- pmd_t *____pmd = (__pmd); \
- if (unlikely(pmd_trans_huge(*____pmd))) \
- __split_huge_page_pmd(__mm, ____pmd); \
- } while (0)
- #define wait_split_huge_page(__anon_vma, __pmd) \
- do { \
- pmd_t *____pmd = (__pmd); \
- spin_unlock_wait(&(__anon_vma)->root->lock); \
- /* \
- * spin_unlock_wait() is just a loop in C and so the \
- * CPU can reorder anything around it. \
- */ \
- smp_mb(); \
- BUG_ON(pmd_trans_splitting(*____pmd) || \
- pmd_trans_huge(*____pmd)); \
- } while (0)
- #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
- #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
- #if HPAGE_PMD_ORDER > MAX_ORDER
- #error "hugepages can't be allocated by the buddy allocator"
- #endif
- extern int hugepage_madvise(unsigned long *vm_flags);
- extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
- unsigned long start,
- unsigned long end,
- long adjust_next);
- static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
- unsigned long start,
- unsigned long end,
- long adjust_next)
- {
- if (!vma->anon_vma || vma->vm_ops || vma->vm_file)
- return;
- __vma_adjust_trans_huge(vma, start, end, adjust_next);
- }
- static inline int hpage_nr_pages(struct page *page)
- {
- if (unlikely(PageTransHuge(page)))
- return HPAGE_PMD_NR;
- return 1;
- }
- #else /* CONFIG_TRANSPARENT_HUGEPAGE */
- #define HPAGE_PMD_SHIFT ({ BUG(); 0; })
- #define HPAGE_PMD_MASK ({ BUG(); 0; })
- #define HPAGE_PMD_SIZE ({ BUG(); 0; })
- #define hpage_nr_pages(x) 1
- #define transparent_hugepage_enabled(__vma) 0
- #define transparent_hugepage_flags 0UL
- static inline int split_huge_page(struct page *page)
- {
- return 0;
- }
- #define split_huge_page_pmd(__mm, __pmd) \
- do { } while (0)
- #define wait_split_huge_page(__anon_vma, __pmd) \
- do { } while (0)
- static inline int hugepage_madvise(unsigned long *vm_flags)
- {
- BUG();
- return 0;
- }
- static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
- unsigned long start,
- unsigned long end,
- long adjust_next)
- {
- }
- #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
- #endif /* _LINUX_HUGE_MM_H */
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