From: "Keshavamurthy, Anil S" <[email protected]>
Avoid checking for cpu gone in mm hot path when CONFIG_HOTPLUG_CPU is not
defined.
Signed-off-by: Anil S Keshavamurthy <[email protected]>
Signed-off-by: Andi Kleen <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Gautham R Shenoy <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
arch/i386/kernel/smp.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
Index: linux/arch/i386/kernel/smp.c
===================================================================
--- linux.orig/arch/i386/kernel/smp.c
+++ linux/arch/i386/kernel/smp.c
@@ -359,10 +359,12 @@ void native_flush_tlb_others(const cpuma
BUG_ON(cpu_isset(smp_processor_id(), cpumask));
BUG_ON(!mm);
+#ifdef CONFIG_HOTPLUG_CPU
/* If a CPU which we ran on has gone down, OK. */
cpus_and(cpumask, cpumask, cpu_online_map);
- if (cpus_empty(cpumask))
+ if (unlikely(cpus_empty(cpumask)))
return;
+#endif
/*
* i'm not happy about this global shared spinlock in the
-
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