tree 3a9dd7e524a784904c3e05cab0586bff349c45d6
parent 0c5f83c23ca703d32f930393825487257a5cde6d
author Mel Gorman <mgorman@suse.de> 1387415318 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1387422291 -0800

mm: numa: ensure anon_vma is locked to prevent parallel THP splits

The anon_vma lock prevents parallel THP splits and any associated
complexity that arises when handling splits during THP migration.  This
patch checks if the lock was successfully acquired and bails from THP
migration if it failed for any reason.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Alex Thorlton <athorlton@sgi.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>