Re: [PATCH] Update sched_domains_numa_masks when new cpus are onlined.

On Mon, 2012-09-24 at 15:27 +0530, Srivatsa S. Bhat wrote:
> On 09/24/2012 03:08 PM, Peter Zijlstra wrote:  
> >> +       hotcpu_notifier(sched_domains_numa_masks_update, CPU_PRI_SCHED_ACTIVE);
> >>         hotcpu_notifier(cpuset_cpu_active, CPU_PRI_CPUSET_ACTIVE);
> >>         hotcpu_notifier(cpuset_cpu_inactive, CPU_PRI_CPUSET_INACTIVE);
> > 
> > OK, so you really want your notifier to run before cpuset_cpu_active
> > because otherwise you get that crash, yet you fail with the whole order
> > thing.. You should not _ever_ rely on registration order.
> > 
> 
> IMHO he isn't relying on registration order.. He uses the CPU_PRI_SCHED_ACTIVE
> priority to ensure that the ordering of callbacks is right, isn't it?

Oh argh indeed. I can't read :/