diff options
Diffstat (limited to 'mm/internal.h')
| -rw-r--r-- | mm/internal.h | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/mm/internal.h b/mm/internal.h index 569facd1f6da..ed8b5ffcf9b1 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -13,6 +13,7 @@ #include <linux/fs.h> #include <linux/mm.h> +#include <linux/pagemap.h> /* * The set of flags that only affect watermark checking and reclaim @@ -265,10 +266,27 @@ static inline void mlock_migrate_page(struct page *newpage, struct page *page) extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma); -#ifdef CONFIG_TRANSPARENT_HUGEPAGE -extern unsigned long vma_address(struct page *page, - struct vm_area_struct *vma); -#endif +/* + * At what user virtual address is page expected in @vma? + */ +static inline unsigned long +__vma_address(struct page *page, struct vm_area_struct *vma) +{ + pgoff_t pgoff = page_to_pgoff(page); + return vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); +} + +static inline unsigned long +vma_address(struct page *page, struct vm_area_struct *vma) +{ + unsigned long address = __vma_address(page, vma); + + /* page should be within @vma mapping range */ + VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma); + + return address; +} + #else /* !CONFIG_MMU */ static inline void clear_page_mlock(struct page *page) { } static inline void mlock_vma_page(struct page *page) { } |