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blkcg: remove unused __blkg_release_rcu()

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An earlier commit 7fcf2b033b ("blkcg: change blkg reference counting
to use percpu_ref") moved around the release call from blkg_put() to be
a part of the percpu_ref cleanup. Remove the additional unused code
which should have been removed earlier.

Signed-off-by: Dennis Zhou <dennis@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Dennis Zhou 2018-12-19 16:43:53 -06:00 committed by Jens Axboe
parent 6ab2187992
commit 6b4505352e
1 changed files with 0 additions and 23 deletions
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23
block/blk-cgroup.c
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@ -438,29 +438,6 @@ static void blkg_destroy_all(struct request_queue *q)
spin_unlock_irq(&q->queue_lock); spin_unlock_irq(&q->queue_lock);
} }
/*
* A group is RCU protected, but having an rcu lock does not mean that one
* can access all the fields of blkg and assume these are valid. For
* example, don't try to follow throtl_data and request queue links.
*
* Having a reference to blkg under an rcu allows accesses to only values
* local to groups like group stats and group rate limits.
*/
void __blkg_release_rcu(struct rcu_head *rcu_head)
{
struct blkcg_gq *blkg = container_of(rcu_head, struct blkcg_gq, rcu_head);
/* release the blkcg and parent blkg refs this blkg has been holding */
css_put(&blkg->blkcg->css);
if (blkg->parent)
blkg_put(blkg->parent);
wb_congested_put(blkg->wb_congested);
blkg_free(blkg);
}
EXPORT_SYMBOL_GPL(__blkg_release_rcu);
static int blkcg_reset_stats(struct cgroup_subsys_state *css, static int blkcg_reset_stats(struct cgroup_subsys_state *css,
struct cftype *cftype, u64 val) struct cftype *cftype, u64 val)
{ {