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| author | Matthew Wilcox <willy@linux.intel.com> | 2015-09-08 14:58:51 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-08 15:35:28 -0700 |
| commit | fc43704437ebe40f642ac53f7ee73661fe74e6b8 (patch) | |
| tree | d45a977cf28e2c463b97e22a26996e55ff7d6404 /include/linux/huge_mm.h | |
| parent | b96375f74a6d4f39fc6cbdc0bce5175115c7f96f (diff) | |
| download | lwn-fc43704437ebe40f642ac53f7ee73661fe74e6b8.tar.gz lwn-fc43704437ebe40f642ac53f7ee73661fe74e6b8.zip | |
mm: export various functions for the benefit of DAX
To use the huge zero page in DAX, we need these functions exported.
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/huge_mm.h')
| -rw-r--r-- | include/linux/huge_mm.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 1c53c7d7ef7e..70587ea079c3 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -155,6 +155,16 @@ 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); +bool set_huge_zero_page(pgtable_t pgtable, struct mm_struct *mm, + struct vm_area_struct *vma, unsigned long haddr, + pmd_t *pmd, struct page *zero_page); + #else /* CONFIG_TRANSPARENT_HUGEPAGE */ #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; }) |