Linus,
Please pull the latest irq-urgent-for-linus git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
irq-urgent-for-linus
HEAD: 0d119fb57614fe947aa9048f61d680bbede64170 Merge branch 'irq/urgent-v2'
of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks into
irq/urgent
Frederic's minimal fix for hardirq/softirq nesting crashes.
Thanks,
Ingo
------------------>
Frederic Weisbecker (1):
irq: Force hardirq exit's softirq processing on its own stack
kernel/softirq.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 53cc09c..d7d498d 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -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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