+ mm-fix-vmstat-after-removing-nr_bounce.patch added to mm-hotfixes-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm: fix vmstat after removing NR_BOUNCE
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     mm-fix-vmstat-after-removing-nr_bounce.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-fix-vmstat-after-removing-nr_bounce.patch

This patch will later appear in the mm-hotfixes-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: mm: fix vmstat after removing NR_BOUNCE
Date: Thu, 29 May 2025 13:38:32 +0300

Hongyu noticed that the nr_unaccepted counter kept growing even in the
absence of unaccepted memory on the machine.

This happens due to a commit that removed NR_BOUNCE: it removed the
counter from the enum zone_stat_item, but left it in the vmstat_text
array.

As a result, all counters below nr_bounce in /proc/vmstat are shifted by
one line, causing the numa_hit counter to be labeled as nr_unaccepted.

To fix this issue, remove nr_bounce from the vmstat_text array.

Link: https://lkml.kernel.org/r/20250529103832.2937460-1-kirill.shutemov@linux.intel.com
Fixes: 194df9f66db8 ("mm: remove NR_BOUNCE zone stat")
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reported-by: Hongyu Ning <hongyu.ning@linux.intel.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/vmstat.c |    1 -
 1 file changed, 1 deletion(-)

--- a/mm/vmstat.c~mm-fix-vmstat-after-removing-nr_bounce
+++ a/mm/vmstat.c
@@ -1201,7 +1201,6 @@ const char * const vmstat_text[] = {
 	"nr_zone_unevictable",
 	"nr_zone_write_pending",
 	"nr_mlock",
-	"nr_bounce",
 #if IS_ENABLED(CONFIG_ZSMALLOC)
 	"nr_zspages",
 #endif
_

Patches currently in -mm which might be from kirill.shutemov@linux.intel.com are

mm-fix-vmstat-after-removing-nr_bounce.patch
mm-strictly-check-vmstat_text-array-size.patch