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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 <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Heiko Carstens <[email protected]>
Acked-by: David Miller <[email protected]>
Cc: Paul Mundt <[email protected]>
Reviewed-by: Frank Rowand <[email protected]>
LKML-Reference: <[email protected]>
This commit is contained in:
Thomas Gleixner 2011-02-02 17:10:48 +01:00
commit c305d524e5
1 changed files with 4 additions and 1 deletions
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5
kernel/softirq.c
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@ -738,7 +738,10 @@ static int run_ksoftirqd(void * __bind_cpu)
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();