Re: sched domains bringup race?

[Nick Piggin]

Dave Hansen wrote:
> I keep getting oopses for the non-boot CPU in find_busiest_group(). 
> This occurs the first time that the CPU goes idle.  Those groups are set
> up in sched_init_smp(), which is called after smp_init():
>
> static int init(void * unused)
> {
> 	...
>         fixup_cpu_present_map();
>         smp_init();
>         sched_init_smp();
>
> But, the idle threads for the secondary CPUs are initialized in
> smp_init().  So, what happens when a CPU tries to schedule (using sched
> domains) before sched_init_smp() completes?  I think it goes boom! :)

It shouldn't because sched_init sets up dummy domains for
all runqueues.

Obviously something is going wrong somewhere though.
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