[Qemu-ppc] pseries on qemu-system-ppc64le crashes in doorbell_core_ipi()

[Nicholas Piggin]

Frederic Weisbecker's on April 6, 2019 10:06 am:
> On Mon, Apr 01, 2019 at 10:38:27AM +0200, Peter Zijlstra wrote:
>> 
>> + fweisbec, who did the remote bits
>> 
>> On Sat, Mar 30, 2019 at 01:10:28PM +1000, Nicholas Piggin wrote:
>> > diff --git a/kernel/irq_work.c b/kernel/irq_work.c
>> > index 6b7cdf17ccf8..f0e539d0f879 100644
>> > --- a/kernel/irq_work.c
>> > +++ b/kernel/irq_work.c
>> > -/* Enqueue the irq work @work on the current CPU */
>> > -bool irq_work_queue(struct irq_work *work)
>> > +/*
>> > + * Enqueue the irq_work @work on @cpu unless it's already pending
>> > + * somewhere.
>> > + *
>> > + * Can be re-enqueued while the callback is still in progress.
>> > + */
>> > +bool irq_work_queue_on(struct irq_work *work, int cpu)
>> >  {
>> > +#ifndef CONFIG_SMP
>> > +	return irq_work_queue(work);
>> > +
> 
> I'd suggest to use "if (!IS_ENABLED(CONFIG_SMP))" here to avoid the large
> ifdeffery.

Sadly you can't do it because arch_send_call_function_single_ipi is
not defined for !SMP. I made your suggested name change though (with
the __ prefix because work needs to be claimed and preempt disabled).

Thanks,
Nick