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SubjectRe: [PATCH] hotplug: Optimize {get,put}_online_cpus()
On 10/01, Paul E. McKenney wrote:
>
> On Tue, Oct 01, 2013 at 08:07:50PM +0200, Oleg Nesterov wrote:
> > On 10/01, Peter Zijlstra wrote:
> > >
> > > On Tue, Oct 01, 2013 at 07:45:08PM +0200, Oleg Nesterov wrote:
> > > >
> > > > I tend to agree with Srivatsa... Without a strong reason it would be better
> > > > to preserve the current logic: "some time after" should not be after the
> > > > next CPU_DOWN/UP*. But I won't argue too much.
> > >
> > > Nah, I think breaking it is the right thing :-)
> >
> > I don't really agree but I won't argue ;)
>
> The authors of arch/x86/kernel/cpu/mcheck/mce.c would seem to be the
> guys who would need to complain, given that they seem to have the only
> use in 3.11.

mce_cpu_callback() is fine, it ignores POST_DEAD if CPU_TASKS_FROZEN.

Oleg.



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