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mm/slub: mark racy access on slab->freelist

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In deactivate_slab(), slab->freelist can be changed concurrently. Mark
data race on slab->freelist as benign using READ_ONCE.

This patch is aimed at reducing the number of benign races reported by
KCSAN in order to focus future debugging effort on harmful races.

Signed-off-by: linke li <lilinke99@qq.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
linke li 2024-04-27 16:51:54 +08:00 committed by Vlastimil Babka
parent b3d8a8e870
commit 844776cb65
1 changed files with 1 additions and 1 deletions
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2
mm/slub.c
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@ -2806,7 +2806,7 @@ static void deactivate_slab(struct kmem_cache *s, struct slab *slab,
struct slab new;
struct slab old;
if (slab->freelist) {
if (READ_ONCE(slab->freelist)) {
stat(s, DEACTIVATE_REMOTE_FREES);
tail = DEACTIVATE_TO_TAIL;
}