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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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