[4.2.y-ckt stable] Patch "mm: vmscan: reclaim highmem zone if buffer_heads is over limit" has been added to the 4.2.y-ckt tree

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    mm: vmscan: reclaim highmem zone if buffer_heads is over limit

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    https://git.launchpad.net/~canonical-kernel/linux/+git/linux-stable-ckt/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt10.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From daadbfa8b08c8f691859dc1097c8e66c8d8c63ae Mon Sep 17 00:00:00 2001
From: Minchan Kim <minchan at kernel.org>
Date: Thu, 28 Apr 2016 16:18:38 -0700
Subject: mm: vmscan: reclaim highmem zone if buffer_heads is over limit

commit 7bf52fb891b64b8d61caf0b82060adb9db761aec upstream.

We have been reclaimed highmem zone if buffer_heads is over limit but
commit 6b4f7799c6a5 ("mm: vmscan: invoke slab shrinkers from
shrink_zone()") changed the behavior so it doesn't reclaim highmem zone
although buffer_heads is over the limit.  This patch restores the logic.

Fixes: 6b4f7799c6a5 ("mm: vmscan: invoke slab shrinkers from shrink_zone()")
Signed-off-by: Minchan Kim <minchan at kernel.org>
Cc: Johannes Weiner <hannes at cmpxchg.org>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 mm/vmscan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 26c86e2..cce9a0d 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2507,7 +2507,7 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
 		sc->gfp_mask |= __GFP_HIGHMEM;

 	for_each_zone_zonelist_nodemask(zone, z, zonelist,
-					requested_highidx, sc->nodemask) {
+					gfp_zone(sc->gfp_mask), sc->nodemask) {
 		enum zone_type classzone_idx;

 		if (!populated_zone(zone))
--
2.7.4