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SubjectRe: [PATCH V2] perf/x86: Consider pinned events for group validation
On Thu, 22 Aug 2019, Andi Kleen wrote:

> > + /*
> > + * Disable interrupts to prevent the events in this CPU's cpuc
> > + * going away and getting freed.
> > + */
> > + local_irq_save(flags);
>
> I believe it's also needed to disable preemption. Probably should
> add a comment, or better an explicit preempt_disable() too.

Preemption is implicit disabled by disabling interrupts.

Thanks,

tglx

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