Patch "mm, vmstat: Remove spurious WARN() during zoneinfo print" has been added to the 4.9-stable tree

Patch "mm, vmstat: Remove spurious WARN() during zoneinfo print" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    mm, vmstat: Remove spurious WARN() during zoneinfo print

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mm-vmstat-remove-spurious-warn-during-zoneinfo-print.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Apr  9 17:09:24 CEST 2018
From: Reza Arbab <arbab@linux.vnet.ibm.com>
Date: Fri, 12 May 2017 15:46:32 -0700
Subject: mm, vmstat: Remove spurious WARN() during zoneinfo print

From: Reza Arbab <arbab@linux.vnet.ibm.com>


[ Upstream commit 8d35bb310698c69d73073b26fc581f2e3f7f621d ]

After commit e2ecc8a79ed4 ("mm, vmstat: print non-populated zones in
zoneinfo"), /proc/zoneinfo will show unpopulated zones.

A memoryless node, having no populated zones at all, was previously
ignored, but will now trigger the WARN() in is_zone_first_populated().

Remove this warning, as its only purpose was to warn of a situation that
has since been enabled.

Aside: The "per-node stats" are still printed under the first populated
zone, but that's not necessarily the first stanza any more.  I'm not
sure which criteria is more important with regard to not breaking
parsers, but it looks a little weird to the eye.

Fixes:  e2ecc8a79ed4 ("mm, vmstat: print node-based stats in zoneinfo file")
Link: http://lkml.kernel.org/r/1493854905-10918-1-git-send-email-arbab@linux.vnet.ibm.com
Signed-off-by: Reza Arbab <arbab@linux.vnet.ibm.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 mm/vmstat.c |    2 --
 1 file changed, 2 deletions(-)

--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1351,8 +1351,6 @@ static bool is_zone_first_populated(pg_d
 			return zone == compare;
 	}
 
-	/* The zone must be somewhere! */
-	WARN_ON_ONCE(1);
 	return false;
 }
 


Patches currently in stable-queue which might be from arbab@linux.vnet.ibm.com are

queue-4.9/mm-vmstat-remove-spurious-warn-during-zoneinfo-print.patch