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| author | Thomas Gleixner <tglx@linutronix.de> | 2011-02-02 17:10:48 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2011-02-08 19:37:12 +0100 |
| commit | c305d524e5dd3c3c7a6035083e30950bea1b52dc (patch) | |
| tree | 2929186dfc8b0f1094375873231809768d1ac385 /kernel/softirq.c | |
| parent | c9a443cdf7726ce8b78c3177c6ae601ce37292fc (diff) | |
| download | lwn-c305d524e5dd3c3c7a6035083e30950bea1b52dc.tar.gz lwn-c305d524e5dd3c3c7a6035083e30950bea1b52dc.zip | |
softirq: Avoid stack switch from ksoftirqd
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>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: David Miller <davem@davemloft.net>
Cc: Paul Mundt <lethal@linux-sh.org>
Reviewed-by: Frank Rowand <frank.rowand@am.sony.com>
LKML-Reference: <alpine.LFD.2.00.1102021704530.31804@localhost6.localdomain6>
Diffstat (limited to 'kernel/softirq.c')
| -rw-r--r-- | kernel/softirq.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/softirq.c b/kernel/softirq.c index 68eb5efec388..c0490464e92f 100644 --- a/kernel/softirq.c +++ b/kernel/softirq.c @@ -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(); |