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Ming Lei authored
blkg_lookup() is called with either queue_lock or rcu read lock, so use rcu_dereference_check(lockdep_is_held(&q->queue_lock)) for retrieving 'blkg', which way models the check exactly for covering queue lock or rcu read lock. Fix lockdep warning of "block/blk-cgroup.h:254 suspicious rcu_dereference_check() usage!" from blkg_lookup(). Tested-by:
Changhui Zhong <czhong@redhat.com> Signed-off-by:
Ming Lei <ming.lei@redhat.com> Reviewed-by:
Yu Kuai <yukuai3@huawei.com> Fixes: 83462a6c ("blkcg: Drop unnecessary RCU read [un]locks from blkg_conf_prep/finish()") Acked-by:
Tejun Heo <tj@kernel.org> Link: https://lore.kernel.org/r/20231219012833.2129540-1-ming.lei@redhat.com Signed-off-by:
Jens Axboe <axboe@kernel.dk>
Ming Lei authoredblkg_lookup() is called with either queue_lock or rcu read lock, so use rcu_dereference_check(lockdep_is_held(&q->queue_lock)) for retrieving 'blkg', which way models the check exactly for covering queue lock or rcu read lock. Fix lockdep warning of "block/blk-cgroup.h:254 suspicious rcu_dereference_check() usage!" from blkg_lookup(). Tested-by:
