Re: [PATCH] perf/x86/intel: Avoid unnecessary reallocations of memory allocated in cpu hotplug prepare state

From: Peter Zijlstra
Date: Tue Dec 18 2018 - 06:02:25 EST

On Tue, Dec 18, 2018 at 06:30:33PM +0800, zhe.he@xxxxxxxxxxxxx wrote:
> Besides, in preempt-rt full mode, the freeing can happen in atomic context and
> thus cause the following BUG.

Hurm, I though we fixed all those long ago..

And no, the patch is horrible; that's what we have things like
x86_pmu::cpu_dead() for.