Re: [PATCH V2] perf/x86: Consider pinned events for group validation

[Andi Kleen]

> +	/*
> +	 * 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.

-Andi