linux-kernel - Re: [PATCH 0/2] Reintroduce picky __compound_tail

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Date:	Tue, 5 May 2015 10:29:52 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrea Arcangeli <aarcange@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Hugh Dickins <hughd@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 0/2] Reintroduce picky __compound_tail_refcounted()

On Tue, Apr 28, 2015 at 07:24:56PM +0300, Kirill A. Shutemov wrote:
> 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(-)

Ping?

-- 
 Kirill A. Shutemov
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