From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH] perf/x86/intel: Avoid unnecessary reallocations of
 memory allocated in cpu hotplug prepare state
Date: Tue, 18 Dec 2018 12:02:09 +0100
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On Tue, Dec 18, 2018 at 06:30:33PM +0800, zhe.he@windriver.com 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.