x86: Don't send RESCHEDULE_VECTOR to offlined cpus

In the x86 native_smp_send_reschedule_function(), don't send the IPI if the
cpu has gone offline already. Warn nevertheless!!

Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c
index 88c1e518a203e236fe3d7ae08ffebdac05aa0ae1..16c52aaaca3517c37e1e99d25c38ab5ce7756b5e 100644 (file)
--- a/arch/x86/kernel/smp.c
+++ b/arch/x86/kernel/smp.c
@@ -118,7 +118,10 @@
  */
 static void native_smp_send_reschedule(int cpu)
 {
-       WARN_ON(cpu_is_offline(cpu));
+       if (unlikely(cpu_is_offline(cpu))) {
+               WARN_ON(1);
+               return;
+       }
        send_IPI_mask(cpumask_of_cpu(cpu), RESCHEDULE_VECTOR);
 }