Commit ee5f80a9 authored Nov 07, 2008 by Thomas Gleixner Committed by Thomas Gleixner Nov 10, 2008

irq: call __irq_enter() before calling the tick_idle_check



Impact: avoid spurious ksoftirqd wakeups

The tick idle check which is called from irq_enter() was run before
the call to __irq_enter() which did not set the in_interrupt() bits in
preempt_count. That way the raise of a softirq woke up softirqd for
nothing as the softirq was handled on return from interrupt.

Call __irq_enter() before calling into the tick idle check code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 5ceb1a04

kernel/softirq.c

+4 −3

Original line number	Diff line number	Diff line
		@@ -269,9 +269,10 @@ void irq_enter(void)
		{
		int cpu = smp_processor_id();

		if (idle_cpu(cpu) && !in_interrupt())
		if (idle_cpu(cpu) && !in_interrupt()) {
		__irq_enter();
		tick_check_idle(cpu);

		} else
		__irq_enter();
		}

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