From mboxrd@z Thu Jan  1 00:00:00 1970
From: Olaf Hering <olaf@aepfle.de>
Subject: Re: [PATCH v2] xen: avoid crash in disable_hotplug_cpu
Date: Fri, 7 Sep 2018 07:45:16 +0200
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Am Thu, 6 Sep 2018 22:31:45 +0200
schrieb Olaf Hering <olaf@aepfle.de>:

> IF cpu0_hotpluggable is broken, then only "if (!cpu) return;" can help.

Another option is to do cpu_online() twice to check if device_offline did a=
nything.
Not sure if the compiler would fold the two checks into a single check.

Olaf

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