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blk-cgroup: avoid to warn !rcu_read_lock_held() in blkg_lookup()
[ Upstream commit35a99d6557
] 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> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -249,8 +249,6 @@ static inline struct blkcg_gq *blkg_lookup(struct blkcg *blkcg,
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{
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struct blkcg_gq *blkg;
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WARN_ON_ONCE(!rcu_read_lock_held());
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if (blkcg == &blkcg_root)
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return q->root_blkg;
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