diff options
| author | Ming Lei <ming.lei@redhat.com> | 2023-11-17 05:35:23 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-12-03 09:33:02 +0300 |
| commit | 3902d1a1b6ddb1ba247b532ee7621d1cd8ac59c9 (patch) | |
| tree | b21b468bd9bdac552f765910b3a476b1738c0bfb /block | |
| parent | 18350d280999cbde37fcac4f55117fbb40972715 (diff) | |
| download | linux-3902d1a1b6ddb1ba247b532ee7621d1cd8ac59c9.tar.xz | |
blk-cgroup: avoid to warn !rcu_read_lock_held() in blkg_lookup()
[ Upstream commit 35a99d6557cacbc177314735342f77a2dda41872 ]
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: 83462a6c971c ("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>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-cgroup.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h index 624c03c8fe64..fd482439afbc 100644 --- a/block/blk-cgroup.h +++ b/block/blk-cgroup.h @@ -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; |