Avoid checking for cpu gone when CONFIG_HOTPLUG_CPU not defined

["Keshavamurthy, Anil S" <anil.s.keshavamurthy@intel.com>]

Subject: Avoid checking for cpu gone when CONFIG_HOTPLUG_CPU not defined

Avoid checking for cpu gone in mm hot path when
CONFIG_HOTPLUG_CPU is not defined.

Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>

---
 arch/i386/kernel/smp.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: work/arch/i386/kernel/smp.c
===================================================================
--- work.orig/arch/i386/kernel/smp.c
+++ work/arch/i386/kernel/smp.c
@@ -365,10 +365,12 @@ static void flush_tlb_others(cpumask_t c
 	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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