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Commit 903b8a8d authored by Karsten Wiese's avatar Karsten Wiese Committed by Thomas Gleixner
Browse files

clockevents: optimise tick_nohz_stop_sched_tick() a bit 



Call
	ts = &per_cpu(tick_cpu_sched, cpu);
and
	cpu = smp_processor_id();
once instead of twice.

No functional change done, as changed code runs with local irq off.
Reduces source lines and text size (20bytes on x86_64).

[ akpm@linux-foundation.org: Build fix ]

Signed-off-by: default avatarKarsten Wiese <fzu@wemgehoertderstaat.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 3f3eafc9

kernel/time/tick-sched.c

+2 −4
Original line number Original line Diff line number Diff line
@@ -158,9 +158,8 @@ void tick_nohz_stop_idle(int cpu) 
	}

	}

}

}





static ktime_t tick_nohz_start_idle(int cpu)

static ktime_t tick_nohz_start_idle(struct tick_sched *ts)

{

{

	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);

	ktime_t now, delta;

	ktime_t now, delta;





	now = ktime_get();

	now = ktime_get();
@@ -201,8 +200,8 @@ void tick_nohz_stop_sched_tick(void) 
	local_irq_save(flags);

	local_irq_save(flags);





	cpu = smp_processor_id();

	cpu = smp_processor_id();

	now = tick_nohz_start_idle(cpu);

	ts = &per_cpu(tick_cpu_sched, cpu);

	ts = &per_cpu(tick_cpu_sched, cpu);

	now = tick_nohz_start_idle(ts);





	/*

	/*

	 * If this cpu is offline and it is the one which updates

	 * If this cpu is offline and it is the one which updates
@@ -222,7 +221,6 @@ void tick_nohz_stop_sched_tick(void) 
	if (need_resched())

	if (need_resched())

		goto end;

		goto end;





	cpu = smp_processor_id();

	if (unlikely(local_softirq_pending())) {

	if (unlikely(local_softirq_pending())) {

		static int ratelimit;

		static int ratelimit;