seems to bad patch. you dereference pointer (1) before check to NULL(2).
> ---
>
> arch/i386/kernel/smp.c | 9 +++++++++
> 1 files changed, 9 insertions(+), 0 deletions(-)
>
> applies-to: e6a6c8ed12ba1ef7fa376fa3993e3c329e9f294a
> 195ab3620ba410697ad78957226c5493d55dd2ee
> diff --git a/arch/i386/kernel/smp.c b/arch/i386/kernel/smp.c
> index 218d725..3d33125 100644
> --- a/arch/i386/kernel/smp.c
> +++ b/arch/i386/kernel/smp.c
> @@ -560,6 +560,7 @@ int smp_call_function (void (*func) (voi
> if (wait)
> while (atomic_read(&data.finished) != cpus)
> cpu_relax();
> + call_data = NULL;
> spin_unlock(&call_lock);
>
> return 0;
> @@ -609,6 +610,14 @@ fastcall void smp_call_function_interrup
> int wait = call_data->wait;
(1) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> ack_APIC_irq();
> +
> + /* Ignore spurious IPIs */
> + if (!call_data)
> + return;
(2) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
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