renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-11-20 08:38:24 +08:00
Code

irq: call __irq_enter() before calling the tick_idle_check

Browse Source 
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>
This commit is contained in:
Thomas Gleixner 2008-11-07 11:06:00 +01:00 committed by Thomas Gleixner
parent 5ceb1a0418
commit ee5f80a993
1 changed files with 4 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
kernel/softirq.c
View File

@ -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