From: Mel Gorman <mgorman@suse.de>
Date: Thu, 19 Dec 2013 01:08:39 +0000 (-0800)
Subject: mm: numa: avoid unnecessary work on the failure path
X-Git-Tag: upstream/snapshot3+hdmi~3754^2~16
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=eb4489f69f224356193364dc2762aa009738ca7f;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

mm: numa: avoid unnecessary work on the failure path

If a PMD changes during a THP migration then migration aborts but the
failure path is doing more work than is necessary.

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>
---

diff --git a/mm/migrate.c b/mm/migrate.c
index be787d5..a987525 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1780,7 +1780,8 @@ fail_putback:
 		putback_lru_page(page);
 		mod_zone_page_state(page_zone(page),
 			 NR_ISOLATED_ANON + page_lru, -HPAGE_PMD_NR);
-		goto out_fail;
+
+		goto out_unlock;
 	}
 
 	/*
@@ -1854,6 +1855,7 @@ out_dropref:
 	}
 	spin_unlock(ptl);
 
+out_unlock:
 	unlock_page(page);
 	put_page(page);
 	return 0;