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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

kernel/softirq.c

+12 −3
Original line number Diff line number Diff line
@@ -328,11 +328,20 @@ 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)

{