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block/bfq-cgroup: use data_race() for online test

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bfqg_prfill_stat_recursive() and bfq_bio_bfqg() read blkg->online
locklessly, same as blkg_rwstat_recursive_sum().  Annotate with
data_race() to silence KCSAN.

Signed-off-by: Tao Cui <cuitao@kylinos.cn>
Reviewed-by: Yu Kuai <yukuai@fygo.io>
Link: https://patch.msgid.link/20260803134104.138411-1-cui.tao@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tao Cui
2026-08-03 20:18:08 -06:00
committed by Jens Axboe
parent 19f6bbd753
commit cbe81d6120
1 changed files with 2 additions and 2 deletions
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block/bfq-cgroup.c
+2 -2
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@@ -610,7 +610,7 @@ struct bfq_group *bfq_bio_bfqg(struct bfq_data *bfqd, struct bio *bio)
struct bfq_group *bfqg;
while (blkg) {
if (!blkg->online) {
if (!data_race(blkg->online)) {
blkg = blkg->parent;
continue;
}
@@ -1168,7 +1168,7 @@ static u64 bfqg_prfill_stat_recursive(struct seq_file *sf,
struct blkg_policy_data *pd;
struct bfq_stat *stat;
if (!pos_blkg->online)
if (!data_race(pos_blkg->online))
continue;
pd = blkg_to_pd(pos_blkg, &blkcg_policy_bfq);