linux-kernel - change of behavior for madvise in 3.9-rc1

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Date:	Wed, 6 Mar 2013 23:05:04 -0500 (EST)
From:	CAI Qian <caiqian@...hat.com>
To:	Shaohua Li <shli@...nel.org>
Cc:	linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: change of behavior for madvise in 3.9-rc1

Bisecting indicated that this commit,
1998cc048901109a29924380b8e91bc049b32951
mm: make madvise(MADV_WILLNEED) support swap file prefetch

Caused an LTP test failure,
http://goo.gl/1FVPy

madvise02    1  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22): Invalid argument
madvise02    2  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22): Invalid argument
madvise02    3  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22): Invalid argument
madvise02    4  TPASS  :  failed as expected: TEST_ERRNO=ENOMEM(12): Cannot allocate memory
madvise02    5  TFAIL  :  madvise succeeded unexpectedly

While it passed without the above commit
madvise02    1  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22): Invalid argument
madvise02    2  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22): Invalid argument
madvise02    3  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22): Invalid argument
madvise02    4  TPASS  :  failed as expected: TEST_ERRNO=ENOMEM(12): Cannot allocate memory
madvise02    5  TPASS  :  failed as expected: TEST_ERRNO=EBADF(9): Bad file descriptor

CAI Qian
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