| #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 void huge_pmd_set_accessed(struct mm_struct *mm, |
| struct vm_area_struct *vma, |
| unsigned long address, pmd_t *pmd, |
| pmd_t orig_pmd, int dirty); |
| 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 struct page *follow_trans_huge_pmd(struct vm_area_struct *vma, |
| unsigned long addr, |
| pmd_t *pmd, |
| unsigned int flags); |
| extern int madvise_free_huge_pmd(struct mmu_gather *tlb, |
| struct vm_area_struct *vma, |
| pmd_t *pmd, unsigned long addr, unsigned long next); |
| extern int zap_huge_pmd(struct mmu_gather *tlb, |
| struct vm_area_struct *vma, |
| pmd_t *pmd, unsigned long addr); |
| extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, |
| unsigned long addr, unsigned long end, |
| unsigned char *vec); |
| extern bool move_huge_pmd(struct vm_area_struct *vma, |
| struct vm_area_struct *new_vma, |
| unsigned long old_addr, |
| unsigned long new_addr, unsigned long old_end, |
| pmd_t *old_pmd, pmd_t *new_pmd); |
| extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, |
| unsigned long addr, pgprot_t newprot, |
| int prot_numa); |
| int vmf_insert_pfn_pmd(struct vm_area_struct *, unsigned long addr, pmd_t *, |
| pfn_t pfn, bool write); |
| enum transparent_hugepage_flag { |
| TRANSPARENT_HUGEPAGE_FLAG, |
| TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG, |
| TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, |
| TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG, |
| TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, |
| TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG, |
| TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG, |
| #ifdef CONFIG_DEBUG_VM |
| TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG, |
| #endif |
| }; |
| |
| #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT) |
| #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER) |
| |
| #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr, |
| pmd_t *pmd, int flags); |
| |
| #define HPAGE_PMD_SHIFT PMD_SHIFT |
| #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT) |
| #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1)) |
| |
| extern bool is_vma_temporary_stack(struct vm_area_struct *vma); |
| |
| #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))) && \ |
| !((__vma)->vm_flags & VM_NOHUGEPAGE) && \ |
| !is_vma_temporary_stack(__vma)) |
| #define transparent_hugepage_use_zero_page() \ |
| (transparent_hugepage_flags & \ |
| (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG)) |
| #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 void prep_transhuge_page(struct page *page); |
| extern void free_transhuge_page(struct page *page); |
| |
| int split_huge_page_to_list(struct page *page, struct list_head *list); |
| static inline int split_huge_page(struct page *page) |
| { |
| return split_huge_page_to_list(page, NULL); |
| } |
| void deferred_split_huge_page(struct page *page); |
| |
| void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, |
| unsigned long address, bool freeze); |
| |
| #define split_huge_pmd(__vma, __pmd, __address) \ |
| do { \ |
| pmd_t *____pmd = (__pmd); \ |
| if (pmd_trans_huge(*____pmd) \ |
| || pmd_devmap(*____pmd)) \ |
| __split_huge_pmd(__vma, __pmd, __address, \ |
| false); \ |
| } while (0) |
| |
| |
| void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address, |
| bool freeze, struct page *page); |
| |
| #if HPAGE_PMD_ORDER >= MAX_ORDER |
| #error "hugepages can't be allocated by the buddy allocator" |
| #endif |
| extern int hugepage_madvise(struct vm_area_struct *vma, |
| unsigned long *vm_flags, int advice); |
| extern void vma_adjust_trans_huge(struct vm_area_struct *vma, |
| unsigned long start, |
| unsigned long end, |
| long adjust_next); |
| extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, |
| struct vm_area_struct *vma); |
| /* mmap_sem must be held on entry */ |
| static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, |
| struct vm_area_struct *vma) |
| { |
| VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma); |
| if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd)) |
| return __pmd_trans_huge_lock(pmd, vma); |
| else |
| return false; |
| } |
| static inline int hpage_nr_pages(struct page *page) |
| { |
| if (unlikely(PageTransHuge(page))) |
| return HPAGE_PMD_NR; |
| return 1; |
| } |
| |
| extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, |
| unsigned long addr, pmd_t pmd, pmd_t *pmdp); |
| |
| extern struct page *huge_zero_page; |
| |
| static inline bool is_huge_zero_page(struct page *page) |
| { |
| return ACCESS_ONCE(huge_zero_page) == page; |
| } |
| |
| static inline bool is_huge_zero_pmd(pmd_t pmd) |
| { |
| return is_huge_zero_page(pmd_page(pmd)); |
| } |
| |
| struct page *get_huge_zero_page(void); |
| |
| #else /* CONFIG_TRANSPARENT_HUGEPAGE */ |
| #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) |
| #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; }) |
| #define HPAGE_PMD_SIZE ({ BUILD_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_to_list(struct page *page, struct list_head *list) |
| { |
| return 0; |
| } |
| static inline int split_huge_page(struct page *page) |
| { |
| return 0; |
| } |
| static inline void deferred_split_huge_page(struct page *page) {} |
| #define split_huge_pmd(__vma, __pmd, __address) \ |
| do { } while (0) |
| |
| static inline void split_huge_pmd_address(struct vm_area_struct *vma, |
| unsigned long address, bool freeze, struct page *page) {} |
| |
| static inline int hugepage_madvise(struct vm_area_struct *vma, |
| unsigned long *vm_flags, int advice) |
| { |
| BUG(); |
| return 0; |
| } |
| static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, |
| unsigned long start, |
| unsigned long end, |
| long adjust_next) |
| { |
| } |
| static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, |
| struct vm_area_struct *vma) |
| { |
| return NULL; |
| } |
| |
| static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, |
| unsigned long addr, pmd_t pmd, pmd_t *pmdp) |
| { |
| return 0; |
| } |
| |
| static inline bool is_huge_zero_page(struct page *page) |
| { |
| return false; |
| } |
| |
| |
| static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma, |
| unsigned long addr, pmd_t *pmd, int flags) |
| { |
| return NULL; |
| } |
| #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
| |
| #endif /* _LINUX_HUGE_MM_H */ |