From: Andi Kleen <andi@firstfloor.org>
Date: Wed, 16 Dec 2009 11:20:00 +0000 (+0100)
Subject: HWPOISON: Use get_user_page_fast in hwpoison madvise
X-Git-Tag: v2.6.33-rc1~45^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d15f107d97bd74c74d8f5144843d372666ddbdac;p=pandora-kernel.git

HWPOISON: Use get_user_page_fast in hwpoison madvise

The previous version didn't take the mmap_sem before calling gup(),
which is racy.

Use get_user_pages_fast() instead which doesn't need any locks.
This is also faster of course, but then it doesn't really matter
because this is just a testing path.

Based on report from Nick Piggin.
Cc: npiggin@suse.de

Signed-off-by: Andi Kleen <ak@linux.intel.com>
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