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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@in.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@in.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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