From e41b10b28a1818ea0d150982a5450dab64025374 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Tue, 4 Sep 2012 17:35:31 -0700 Subject: [PATCH] rcu: Apply micro-optimization and int/bool fixes to RCU's idle handling Checking "user" before "is_idle_task()" allows better optimizations in cases where inlining is possible. Also, "bool" should be passed "true" or "false" rather than "1" or "0". This commit therefore makes these changes, as noted in Josh's review. Reported-by: Josh Triplett Signed-off-by: Paul E. McKenney Signed-off-by: Paul E. McKenney Reviewed-by: Josh Triplett --- kernel/rcutree.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/kernel/rcutree.c b/kernel/rcutree.c index d34094ae176e..ce41aebd00d1 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -359,7 +359,7 @@ static void rcu_eqs_enter_common(struct rcu_dynticks *rdtp, long long oldval, bool user) { trace_rcu_dyntick("Start", oldval, 0); - if (!is_idle_task(current) && !user) { + if (!user && !is_idle_task(current)) { struct task_struct *idle = idle_task(smp_processor_id()); trace_rcu_dyntick("Error on entry: not idle task", oldval, 0); @@ -423,7 +423,7 @@ void rcu_idle_enter(void) unsigned long flags; local_irq_save(flags); - rcu_eqs_enter(0); + rcu_eqs_enter(false); local_irq_restore(flags); } EXPORT_SYMBOL_GPL(rcu_idle_enter); @@ -448,7 +448,7 @@ void rcu_user_enter(void) rdtp = &__get_cpu_var(rcu_dynticks); if (!rdtp->ignore_user_qs && !rdtp->in_user) { rdtp->in_user = true; - rcu_eqs_enter(1); + rcu_eqs_enter(true); } local_irq_restore(flags); } @@ -506,7 +506,7 @@ void rcu_irq_exit(void) if (rdtp->dynticks_nesting) trace_rcu_dyntick("--=", oldval, rdtp->dynticks_nesting); else - rcu_eqs_enter_common(rdtp, oldval, 1); + rcu_eqs_enter_common(rdtp, oldval, true); local_irq_restore(flags); } @@ -527,7 +527,7 @@ static void rcu_eqs_exit_common(struct rcu_dynticks *rdtp, long long oldval, WARN_ON_ONCE(!(atomic_read(&rdtp->dynticks) & 0x1)); rcu_cleanup_after_idle(smp_processor_id()); trace_rcu_dyntick("End", oldval, rdtp->dynticks_nesting); - if (!is_idle_task(current) && !user) { + if (!user && !is_idle_task(current)) { struct task_struct *idle = idle_task(smp_processor_id()); trace_rcu_dyntick("Error on exit: not idle task", @@ -574,7 +574,7 @@ void rcu_idle_exit(void) unsigned long flags; local_irq_save(flags); - rcu_eqs_exit(0); + rcu_eqs_exit(false); local_irq_restore(flags); } EXPORT_SYMBOL_GPL(rcu_idle_exit); @@ -595,7 +595,7 @@ void rcu_user_exit(void) rdtp = &__get_cpu_var(rcu_dynticks); if (rdtp->in_user) { rdtp->in_user = false; - rcu_eqs_exit(1); + rcu_eqs_exit(true); } local_irq_restore(flags); } @@ -657,7 +657,7 @@ void rcu_irq_enter(void) if (oldval) trace_rcu_dyntick("++=", oldval, rdtp->dynticks_nesting); else - rcu_eqs_exit_common(rdtp, oldval, 1); + rcu_eqs_exit_common(rdtp, oldval, true); local_irq_restore(flags); } -- 2.39.5