page_anon_vma() directly checks PAGE_MAPPING_ANON and PAGE_MAPPING_KSM
bits on page->mapping to find out if page->mapping is anon_vma;
Let's use PageAnon() and PageKsm() helpers instead. It helps readability
and makes page_anon_vma() work correctly on tail pages.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
include/linux/rmap.h | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 9c5ff69fa0cd..21f10e53bb9e 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -108,8 +108,7 @@ static inline void put_anon_vma(struct anon_vma *anon_vma)
static inline struct anon_vma *page_anon_vma(struct page *page)
{
- if (((unsigned long)page->mapping & PAGE_MAPPING_FLAGS) !=
- PAGE_MAPPING_ANON)
+ if (!PageAnon(page) || PageKsm(page))
return NULL;
return page_rmapping(page);
}
--
2.1.4
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>