linux-kernel - [PATCH] x86: Don't send RESCHEDULE

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Message-ID: <20080310121403.GD17646@in.ibm.com>
Date:	Mon, 10 Mar 2008 17:44:03 +0530
From:	Gautham R Shenoy <ego@...ibm.com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Subject: [PATCH] x86: Don't send RESCHEDULE_VECTOR to offlined cpus

x86: Don't send RESCHEDULE_VECTOR to offlined cpus.
From: Gautham R Shenoy <ego@...ibm.com>

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@...ibm.com>
---

 arch/x86/kernel/smp_32.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/smp_32.c b/arch/x86/kernel/smp_32.c
index dc0cde9..4df9042 100644
--- a/arch/x86/kernel/smp_32.c
+++ b/arch/x86/kernel/smp_32.c
@@ -472,7 +472,10 @@ void flush_tlb_all(void)
  */
 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);
 }
 
-- 
Thanks and Regards
gautham
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