On Thu, May 24, 2012 at 07:50:24PM +0000, Pantelis Antoniou wrote:
> omap2plus_defconfig builds with SMP & SMP_ON_UP set.
> On beagle (which is UP) is_smp() returns false and we don't call
> smp_init_cpus which in turn does not initialize smp_cross_call which
> remains NULL.
>
> When issuing a reboot we OOPS with a NULL dereference on stop smp_call.
I've been wondering whether we should make smp_cross_call() a no-op instead
by default, rather than a NULL pointer.
Alternatively, if may be well worth changing this to do:
if (!cpumask_empty(&mask))
smp_cross_call(&mask, IPI_CPU_STOP);
instead, so we avoid calling smp_cross_call() when we're on a SMP system
with only one CPU online. I like this approach better because it removes
a potential call into platform code which is inappropriate.
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