[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists