Re: [Xen-devel] [PATCH v2] xen: avoid crash in disable_hotplug_cpu

[Olaf Hering <olaf@xxxxxxxxx>]

Am Thu, 6 Sep 2018 22:31:45 +0200
schrieb Olaf Hering <olaf@xxxxxxxxx>:

> 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 
anything.
Not sure if the compiler would fold the two checks into a single check.

Olaf

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