tree 39e416568334e656764c3a5eab0b5939f6121779
parent e4b294c2d8f73af4cd41ff30638ad0e4769dc56a
author Wang, Yalin <Yalin.Wang@sonymobile.com> 1423697088 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1423703160 -0800

mm: add VM_BUG_ON_PAGE() to page_mapcount()

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>