linux-kernel - Re: [PATCH v2] xen: avoid crash in disable_hotplug

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Message-ID: <20180907074516.0b41c22c.olaf@aepfle.de>
Date:   Fri, 7 Sep 2018 07:45:16 +0200
From:   Olaf Hering <olaf@...fle.de>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     xen-devel@...ts.xenproject.org, Juergen Gross <jgross@...e.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] xen: avoid crash in disable_hotplug_cpu

Am Thu, 6 Sep 2018 22:31:45 +0200
schrieb Olaf Hering <olaf@...fle.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 anything.
Not sure if the compiler would fold the two checks into a single check.

Olaf

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