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blk-cgroup: avoid to warn !rcu_read_lock_held() in blkg_lookup() 

So far, all callers either holds spin lock or rcu read explicitly, and
most of the caller has added WARN_ON_ONCE(!rcu_read_lock_held()) or
lockdep_assert_held(&disk->queue->queue_lock).

Remove WARN_ON_ONCE(!rcu_read_lock_held()) from blkg_lookup() for
killing the false positive warning from blkg_conf_prep().

Reported-by: Changhui Zhong <czhong@redhat.com>
Fixes: 83462a6c97 ("blkcg: Drop unnecessary RCU read [un]locks from blkg_conf_prep/finish()")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20231117023527.3188627-3-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2023-11-17 10:35:23 +08:00 committed by Jens Axboe
parent 27b13e209d
commit 35a99d6557
1 changed files with 0 additions and 2 deletions
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2
block/blk-cgroup.h
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@ -249,8 +249,6 @@ static inline struct blkcg_gq *blkg_lookup(struct blkcg *blkcg,
{
struct blkcg_gq *blkg;
WARN_ON_ONCE(!rcu_read_lock_held());
if (blkcg == &blkcg_root)
return q->root_blkg;