The patch titled
Subject: mm: add VM_BUG_ON_PAGE() to page_mapcount()
has been added to the -mm tree. Its filename is
mm-add-vm_bug_on_page-for-page_mapcount.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-add-vm_bug_on_page-for-page_mapcount.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-add-vm_bug_on_page-for-page_mapcount.patch
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------------------------------------------------------
From: "Wang, Yalin" <Yalin.Wang@xxxxxxxxxxxxxx>
Subject: 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@xxxxxxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN include/linux/mm.h~mm-add-vm_bug_on_page-for-page_mapcount include/linux/mm.h
--- a/include/linux/mm.h~mm-add-vm_bug_on_page-for-page_mapcount
+++ a/include/linux/mm.h
@@ -467,7 +467,8 @@ static inline void page_mapcount_reset(s
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)
_
Patches currently in -mm which might be from Yalin.Wang@xxxxxxxxxxxxxx are
origin.patch
mm-add-vm_bug_on_page-for-page_mapcount.patch
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