Commit 7f467cbf authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull irq fix from Ingo Molnar:
 "Frederic's minimal fix for hardirq/softirq nesting crashes"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irq: Force hardirq exit's softirq processing on its own stack
parents 6d15ee49 0d119fb5
......@@ -328,10 +328,19 @@ void irq_enter(void)
static inline void invoke_softirq(void)
{
if (!force_irqthreads)
__do_softirq();
else
if (!force_irqthreads) {
/*
* We can safely execute softirq on the current stack if
* it is the irq stack, because it should be near empty
* at this stage. But we have no way to know if the arch
* calls irq_exit() on the irq stack. So call softirq
* in its own stack to prevent from any overrun on top
* of a potentially deep task stack.
*/
do_softirq();
} else {
wakeup_softirqd();
}
}
static inline void tick_irq_exit(void)
......
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