From: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Date: Thu, 29 May 2025 10:38:32 +0000 (+0300)
Subject: mm: fix vmstat after removing NR_BOUNCE
X-Git-Tag: v6.16-rc1~16^2~11
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=684088173b1852e5f5891a7b2a124b7974cb827d;p=linux-block.git

mm: fix vmstat after removing NR_BOUNCE

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>
---

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 6f740f070b3d..429ae5339bfe 100644
--- a/mm/vmstat.c
+++ b/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