Check for current cpu's idleness is already done in implementation of sched_select_cpu() which is called by get_nohz_timer_target(). So, no need to call idle_cpu() twice, once from sched_select_cpu() and once from timer and hrtimer before calling get_nohz_timer_target().
This patch removes calls to idle_cpu() from timer and hrtimer.
Signed-off-by: Viresh Kumar viresh.kumar@linaro.org --- kernel/hrtimer.c | 2 +- kernel/timer.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c index cc47812..c56668d 100644 --- a/kernel/hrtimer.c +++ b/kernel/hrtimer.c @@ -161,7 +161,7 @@ struct hrtimer_clock_base *lock_hrtimer_base(const struct hrtimer *timer, static int hrtimer_get_target(int this_cpu, int pinned) { #ifdef CONFIG_NO_HZ - if (!pinned && get_sysctl_timer_migration() && idle_cpu(this_cpu)) + if (!pinned && get_sysctl_timer_migration()) return get_nohz_timer_target(); #endif return this_cpu; diff --git a/kernel/timer.c b/kernel/timer.c index dbf7a78..83a0d3c 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -739,7 +739,7 @@ __mod_timer(struct timer_list *timer, unsigned long expires, cpu = smp_processor_id();
#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) - if (!pinned && get_sysctl_timer_migration() && idle_cpu(cpu)) + if (!pinned && get_sysctl_timer_migration()) cpu = get_nohz_timer_target(); #endif new_base = per_cpu(tvec_bases, cpu);