Messages in this thread Patch in this message | | | From | "Paul E. McKenney" <> | Subject | [PATCH tip/core/rcu 03/18] rcu: rcu_qs -- Use raise_softirq_irqoff to not save irqs twice | Date | Tue, 26 Mar 2019 16:12:59 -0700 |
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From: Cyrill Gorcunov <gorcunov@gmail.com>
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> --- kernel/rcu/tiny.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c index 911bd9076d43..477b4eb44af5 100644 --- a/kernel/rcu/tiny.c +++ b/kernel/rcu/tiny.c @@ -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); } -- 2.17.1
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