perf,rcu: convert call_rcu(swevent_hlist_release_rcu) to kfree_rcu() (fa4bbc4c) · Commits · 戴 / test

The rcu callback swevent_hlist_release_rcu() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(swevent_hlist_release_rcu). Signed-off-by:

Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by:

Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by:

Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by:

Josh Triplett <josh@joshtriplett.org>

kernel/perf_event.c

+1 −9

Original line number	Diff line number	Diff line
		@@ -5323,14 +5323,6 @@ swevent_hlist_deref(struct swevent_htable *swhash)
		lockdep_is_held(&swhash->hlist_mutex));
		}

		static void swevent_hlist_release_rcu(struct rcu_head *rcu_head)
		{
		struct swevent_hlist *hlist;

		hlist = container_of(rcu_head, struct swevent_hlist, rcu_head);
		kfree(hlist);
		}

		static void swevent_hlist_release(struct swevent_htable *swhash)
		{
		struct swevent_hlist *hlist = swevent_hlist_deref(swhash);
		@@ -5339,7 +5331,7 @@ static void swevent_hlist_release(struct swevent_htable *swhash)
		return;

		rcu_assign_pointer(swhash->swevent_hlist, NULL);
		call_rcu(&hlist->rcu_head, swevent_hlist_release_rcu);
		kfree_rcu(hlist, rcu_head);
		}

		static void swevent_hlist_put_cpu(struct perf_event *event, int cpu)

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