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SubjectRe: [thisops uV2 05/10] x86: Use this_cpu_inc_return for nmi counter
* Christoph Lameter (cl@linux.com) wrote:
> this_cpu_inc_return() saves us a memory access there.
>

Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

> Reviewed-by: Tejun Heo <tj@kernel.org>
> Signed-off-by: Christoph Lameter <cl@linux.com>
>
> ---
> arch/x86/kernel/apic/nmi.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> Index: linux-2.6/arch/x86/kernel/apic/nmi.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/apic/nmi.c 2010-11-23 16:35:19.000000000 -0600
> +++ linux-2.6/arch/x86/kernel/apic/nmi.c 2010-11-23 16:38:29.000000000 -0600
> @@ -432,8 +432,7 @@ nmi_watchdog_tick(struct pt_regs *regs,
> * 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..
> */
>

--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com


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