Messages in this thread Patch in this message | | | Date | Fri, 26 Nov 2010 15:09:42 -0600 | From | Christoph Lameter <> | Subject | [thisops uV2 05/10] 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: 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.. */
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