Commit 18d7e406 authored Jan 24, 2019 by Cyrill Gorcunov Committed by Paul E. McKenney Mar 26, 2019

rcu: rcu_qs -- Use raise_softirq_irqoff to not save irqs twice



The rcu_qs is disabling IRQs by self so no need to do the same in raise_softirq
but instead we can save some cycles using raise_softirq_irqoff directly.

CC: Paul E. McKenney <paulmck@linux.ibm.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>

parent 671a6351

kernel/rcu/tiny.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -52,7 +52,7 @@ void rcu_qs(void)
		local_irq_save(flags);
		if (rcu_ctrlblk.donetail != rcu_ctrlblk.curtail) {
		rcu_ctrlblk.donetail = rcu_ctrlblk.curtail;
		raise_softirq(RCU_SOFTIRQ);
		raise_softirq_irqoff(RCU_SOFTIRQ);
		}
		local_irq_restore(flags);
		}

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