From: Thomas Gleixner Date: Fri, 7 Nov 2008 10:06:00 +0000 (+0100) Subject: irq: call __irq_enter() before calling the tick_idle_check X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ee5f80a993539490a07477ff2526bf62c503fbb4;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git 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 Signed-off-by: Ingo Molnar --- diff --git a/kernel/softirq.c b/kernel/softirq.c index 7110daeb9a90..e7c69a720d69 100644 --- a/kernel/softirq.c +++ b/kernel/softirq.c @@ -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