i386: speedup touch_nmi_watchdog
Avoid dirtying remote cpu's memory if it already has the correct value. Cc: Andi Kleen <ak@suse.de> Cc: Konrad Rzeszutek <konrad@darnok.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -304,9 +304,11 @@ void touch_nmi_watchdog (void)
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* Just reset the alert counters, (other CPUs might be
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* spinning on locks we hold):
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*/
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for_each_present_cpu (cpu)
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for_each_present_cpu(cpu) {
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if (alert_counter[cpu])
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alert_counter[cpu] = 0;
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}
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}
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/*
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* Tickle the softlockup detector too:
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