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Commit 9910affa authored by Yao Dongdong's avatar Yao Dongdong Committed by Paul E. McKenney
Browse files

rcu: Remove redundant check of cpu_online() 



Because invoke_cpu_core() checks whether the current CPU is online,
there is no need for __call_rcu_core() to redundantly check it.
There should not be any performance degradation because the called
function is visible to the compiler.  This commit therefore removes
the redundant check.

Signed-off-by: default avatarYao Dongdong <yaodongdong@huawei.com>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent e7580f33

kernel/rcu/tree.c

+1 −1
Original line number Diff line number Diff line
@@ -2741,7 +2741,7 @@ static void __call_rcu_core(struct rcu_state *rsp, struct rcu_data *rdp, 
	 * If called from an extended quiescent state, invoke the RCU

	 * core in order to force a re-evaluation of RCU's idleness.

	 */

	if (!rcu_is_watching() && cpu_online(smp_processor_id()))

	if (!rcu_is_watching())

		invoke_rcu_core();



	/* If interrupts were disabled or CPU offline, don't invoke RCU core. */