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mm: add VM_BUG_ON_PAGE() to page_mapcount()

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Add VM_BUG_ON_PAGE() for slab pages.  _mapcount is an union with slab
struct in struct page, so we must avoid accessing _mapcount if this page
is a slab page.  Also remove the unneeded bracket.

Signed-off-by: Yalin Wang <yalin.wang@sonymobile.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wang, Yalin 2015-02-11 15:24:48 -08:00 committed by Linus Torvalds
parent e4b294c2d8
commit 1d148e218a
1 changed files with 2 additions and 1 deletions
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include/linux/mm.h
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@ -484,7 +484,8 @@ static inline void page_mapcount_reset(struct page *page)
static inline int page_mapcount(struct page *page) static inline int page_mapcount(struct page *page)
{ {
return atomic_read(&(page)->_mapcount) + 1; VM_BUG_ON_PAGE(PageSlab(page), page);
return atomic_read(&page->_mapcount) + 1;
} }
static inline int page_count(struct page *page) static inline int page_count(struct page *page)