Re: [PATCH 1/4] blkcg: Drop unnecessary RCU read [un]locks from blkg_conf_prep/finish()

[Christoph Hellwig]

On Thu, Jan 05, 2023 at 11:24:29AM -1000, Tejun Heo wrote:
> Holding the queue lock now implies RCU read lock, so no need to use
> rcu_read_[un]lock() explicitly. This shouldn't cause any behavior changes.

How so?

> While at it, drop __acquires() annotation on the queue lock too. The
> __acquires() part was already out of sync and it doesn't catch anything that
> lockdep can't.

This makes sparse even more unhappy than it was before.  For now
please keep the annotation.