From: Gautham R Shenoy <ego@in.ibm.com>
Date: Mon, 10 Mar 2008 12:14:03 +0000 (+0530)
Subject: x86: Don't send RESCHEDULE_VECTOR to offlined cpus
X-Git-Tag: v2.6.26-rc1~1154^2~419
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f694010185c429629ad5a65245da08103e611852;p=linux-2.6

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 88c1e518a2..16c52aaaca 100644
--- 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);
 }