| From | "Kirill A. Shutemov" <> | Subject | [PATCHv4 02/24] mm: change PageAnon() and page_anon_vma() to work on tail pages | Date | Wed, 4 Mar 2015 18:32:50 +0200 |
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Currently PageAnon() and page_anon_vma() are always return false/NULL for tail. We need to look on head page for correct answer.
Let's change the function to give the correct result for tail page.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> --- include/linux/mm.h | 1 + include/linux/rmap.h | 1 + 2 files changed, 2 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h index 9c21b42d07bf..1aea94e837a0 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1047,6 +1047,7 @@ struct address_space *page_file_mapping(struct page *page) static inline int PageAnon(struct page *page) { + page = compound_head(page); return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0; } diff --git a/include/linux/rmap.h b/include/linux/rmap.h index 9c5ff69fa0cd..c4088feac1fc 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -108,6 +108,7 @@ static inline void put_anon_vma(struct anon_vma *anon_vma) static inline struct anon_vma *page_anon_vma(struct page *page) { + page = compound_head(page); if (((unsigned long)page->mapping & PAGE_MAPPING_FLAGS) != PAGE_MAPPING_ANON) return NULL; -- 2.1.4
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