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x86: Use this_cpu_inc_return for nmi counter

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this_cpu_inc_return() saves us a memory access there.

Reviewed-by: Pekka Enberg <penberg@kernel.org>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2010-12-18 16:30:48 +01:00
parent 7b543a5334
commit c1955b5f3a
1 changed files with 1 additions and 2 deletions
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3
arch/x86/kernel/apic/nmi.c
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@ -432,8 +432,7 @@ nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
* Ayiee, looks like this CPU is stuck ...
* wait a few IRQs (5 seconds) before doing the oops ...
*/
__this_cpu_inc(alert_counter);
if (__this_cpu_read(alert_counter) == 5 * nmi_hz)
if (__this_cpu_inc_return(alert_counter) == 5 * nmi_hz)
/*
* die_nmi will return ONLY if NOTIFY_STOP happens..
*/