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irq: call __irq_enter() before calling the tick_idle_check

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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 <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Thomas Gleixner authored and Thomas Gleixner committed 2008-11-10 22:36:39 +01:00
1 parent 5ceb1a0418
commit ee5f80a993
1 file changed
+4 -3
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kernel/softirq.c
+4 -3
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@@ -269,10 +269,11 @@ 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);
__irq_enter();
} else
__irq_enter();
}
#ifdef __ARCH_IRQ_EXIT_IRQS_DISABLED