Messages in this thread | | | From | "Kirill A. Shutemov" <> | Subject | [PATCH 0/2] Reintroduce picky __compound_tail_refcounted() | Date | Tue, 28 Apr 2015 19:24:56 +0300 |
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Hi Andrew,
My patch 8d63d99a5dfb which was merged during 4.1 merge window caused regression:
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!
The patch was reverted by Linus.
This VM_BUG_ON_PAGE() is bogus. The first patch explains why the assert is wrong and removes it. The second re-introduces original patch.
Kirill A. Shutemov (2): mm: drop bogus VM_BUG_ON_PAGE assert in put_page() codepath mm: avoid tail page refcounting on non-THP compound pages
include/linux/mm.h | 2 +- mm/swap.c | 1 - 2 files changed, 1 insertion(+), 2 deletions(-)
-- 2.1.4
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