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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>
This commit is contained in:
Cyrill Gorcunov 2019-01-24 21:14:37 +03:00 committed by Paul E. McKenney
parent 671a63517c
commit 18d7e40679
1 changed files with 1 additions and 1 deletions
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2
kernel/rcu/tiny.c
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@ -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);
}