--- /dev/null
+#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 */
Code Review / kvmfornfv.git / blobdiff