thp: reintroduce split_huge_page()

[linux-2.6-block.git] / include / linux / huge_mm.h

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index ecb080d6ff42077513f03b95537dc108bded9e07..90e11e6a37ab42257af03d7c9780a8c22f809817 100644 (file)
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -25,7 +25,7 @@ extern int zap_huge_pmd(struct mmu_gather *tlb,
 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,
+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,
@@ -48,15 +48,9 @@ enum transparent_hugepage_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)
@@ -95,30 +89,23 @@ extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
 #endif /* CONFIG_DEBUG_VM */
 
 extern unsigned long transparent_hugepage_flags;
-extern int split_huge_page_to_list(struct page *page, struct list_head *list);
+
+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)                   \
+
+void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
+               unsigned long address);
+
+#define split_huge_pmd(__vma, __pmd, __address)                                \
        do {                                                            \
                pmd_t *____pmd = (__pmd);                               \
-               if (unlikely(pmd_trans_huge(*____pmd)))                 \
-                       __split_huge_page_pmd(__vma, __address,         \
-                                       ____pmd);                       \
+               if (pmd_trans_huge(*____pmd))                           \
+                       __split_huge_pmd(__vma, __pmd, __address);      \
        }  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
@@ -128,17 +115,17 @@ 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,
+extern bool __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,
+static inline bool 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;
+               return false;
 }
 static inline int hpage_nr_pages(struct page *page)
 {
@@ -183,11 +170,7 @@ 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) \
+#define split_huge_pmd(__vma, __pmd, __address)        \
        do { } while (0)
 static inline int hugepage_madvise(struct vm_area_struct *vma,
                                   unsigned long *vm_flags, int advice)
@@ -201,10 +184,10 @@ static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
                                         long adjust_next)
 {
 }
-static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
+static inline bool pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
                spinlock_t **ptl)
 {
-       return 0;
+       return false;
 }
 
 static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,