#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 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 int 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); 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, TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_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, spinlock_t **ptl); #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT) #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER) #ifdef CONFIG_TRANSPARENT_HUGEPAGE #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_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)) #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 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); } extern void __split_huge_page_pmd(struct vm_area_struct *vma, unsigned long address, pmd_t *pmd); #define split_huge_page_pmd(__vma, __address, __pmd) \ do { \ pmd_t *____pmd = (__pmd); \ if (unlikely(pmd_trans_huge(*____pmd))) \ __split_huge_page_pmd(__vma, __address, \ ____pmd); \ } while (0) #define wait_split_huge_page(__anon_vma, __pmd) \ do { \ pmd_t *____pmd = (__pmd); \ anon_vma_lock_write(__anon_vma); \ anon_vma_unlock_write(__anon_vma); \ BUG_ON(pmd_trans_splitting(*____pmd) || \ pmd_trans_huge(*____pmd)); \ } while (0) extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address, pmd_t *pmd); #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 int __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma, spinlock_t **ptl); /* mmap_sem must be held on entry */ static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma, spinlock_t **ptl) { VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma); if (pmd_trans_huge(*pmd)) return __pmd_trans_huge_lock(pmd, vma, ptl); else return 0; } 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) 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; } 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; } #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; } #define split_huge_page_pmd(__vma, __address, __pmd) \ do { } while (0) #define wait_split_huge_page(__anon_vma, __pmd) \ do { } while (0) #define split_huge_page_pmd_mm(__mm, __address, __pmd) \ do { } while (0) 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 int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma, spinlock_t **ptl) { return 0; } 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; } #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ #endif /* _LINUX_HUGE_MM_H */