[PATCH] block/bfq-cgroup: use data_race() for online test
From: Tao Cui <hidden>
Date: 2026-08-03 13:41:18
Also in:
cgroups, lkml
Subsystem:
bfq i/o scheduler, block layer, control group - block io controller (blkio), the rest · Maintainers:
Yu Kuai, Jens Axboe, Tejun Heo, Josef Bacik, Linus Torvalds
From: Tao Cui <redacted> 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 <redacted> --- block/bfq-cgroup.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
index e82ff03bda02..ef9d63e8542e 100644
--- a/block/bfq-cgroup.c
+++ b/block/bfq-cgroup.c@@ -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);
--
2.43.0