diff options
Diffstat (limited to 'kernel/softirq.c')
| -rw-r--r-- | kernel/softirq.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/kernel/softirq.c b/kernel/softirq.c index be3d3514c325..d7d498d8cc4f 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) @@ -876,7 +885,6 @@ int __init __weak early_irq_init(void) return 0; } -#ifdef CONFIG_GENERIC_HARDIRQS int __init __weak arch_probe_nr_irqs(void) { return NR_IRQS_LEGACY; @@ -886,4 +894,3 @@ int __init __weak arch_early_irq_init(void) { return 0; } -#endif |