Messages in this thread Patch in this message | | | Date | Wed, 2 Feb 2011 17:10:48 +0100 (CET) | From | Thomas Gleixner <> | Subject | [PATCH] softirq: Avoid stack switch from ksoftirqd |
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ksoftirqd() calls do_softirq() which switches stacks on several architectures. That makes no sense at all. ksoftirqd's stack is sufficient.
Call __do_softirq() directly.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- kernel/softirq.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
Index: linux-2.6-tip/kernel/softirq.c =================================================================== --- linux-2.6-tip.orig/kernel/softirq.c +++ linux-2.6-tip/kernel/softirq.c @@ -738,7 +738,10 @@ static int run_ksoftirqd(void * __bind_c don't process */ if (cpu_is_offline((long)__bind_cpu)) goto wait_to_die; - do_softirq(); + local_irq_disable(); + if (local_softirq_pending()) + __do_softirq(); + local_irq_enable(); preempt_enable_no_resched(); cond_resched(); preempt_disable();
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