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authorLinus Torvalds <torvalds@linux-foundation.org>2015-04-22 09:44:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-22 09:44:36 -0700
commitf3ca10dde49043fbbb055854278b26954b549b36 (patch)
tree1358fc0cb8167b6294ec8d3a37d3e349d512c843
parent5e6c94a999f67f120c6bbba71bbee840dfee6338 (diff)
downloadop-kernel-dev-f3ca10dde49043fbbb055854278b26954b549b36.zip
op-kernel-dev-f3ca10dde49043fbbb055854278b26954b549b36.tar.gz
Revert "mm: avoid tail page refcounting on non-THP compound pages"
This reverts commit 8d63d99a5dfbdb997d12dd3c07b2070ca723db3b. It causes in VM mapping refcount errors: page:ffffea0010a15040 count:0 mapcount:1 mapping: (null) index:0x0 flags: 0x8000000000008014(referenced|dirty|tail) page dumped because: VM_BUG_ON_PAGE(page_mapcount(page) != 0) ------------[ cut here ]------------ kernel BUG at mm/swap.c:134! as reported by Borislav Petkov Reported-and-tested-by: Borislav Petkov <bp@alien8.de> Cc: Kirill A. Shutemov <kirill@shutemov.name> Cc: Hugh Dickins <hughd@google.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: linux-mm@kvack.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/mm.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8b08607..0755b9f 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -499,7 +499,7 @@ static inline int page_count(struct page *page)
static inline bool __compound_tail_refcounted(struct page *page)
{
- return PageAnon(page) && !PageSlab(page) && !PageHeadHuge(page);
+ return !PageSlab(page) && !PageHeadHuge(page);
}
/*
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