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%3Ba=su...
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.... 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