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Date:	Mon,  7 Feb 2011 16:47:34 -0800
From:	Michel Lespinasse <>
To:, Lee Schermerhorn <>
Cc:	Andrew Morton <>,
	KAMEZAWA Hiroyuki <>,
	Hugh Dickins <>,
	Rik van Riel <>,
	Andrea Arcangeli <>,
Subject: [PATCH 0/2] page munlock issues when breaking up COW

It looks like there is a race in the do_wp_page() code that munlocks the
old page after breaking up COW. The pte still points to that old page,
so I don't see that we are protected against vmscan mlocking back the
page right away. This can be easily worked around by moving that code to
the end of do_wp_page(), after the pte has been pointed to the new page.

Also, the corresponding code in __do_fault() seems entirely unnecessary,
since there was never a pte pointing to the old page in our vma.

Michel Lespinasse (2):
  mlock: fix race when munlocking pages in do_wp_page()
  mlock: do not munlock pages in __do_fault()

 mm/memory.c |   32 ++++++++++++--------------------
 1 files changed, 12 insertions(+), 20 deletions(-)

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