linux-kernel - Re: [PATCH v4] xen: avoid crash in disable_hotplug

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Message-ID: <20180911095258.5ed9e9b7.olaf@aepfle.de>
Date:   Tue, 11 Sep 2018 09:52:58 +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 v4] xen: avoid crash in disable_hotplug_cpu

Am Fri, 7 Sep 2018 12:56:37 -0400
schrieb Boris Ostrovsky <boris.ostrovsky@...cle.com>:

> I was hoping you'd respond to my question about warning.

It looks like CONFIG_BOOTPARAM_HOTPLUG_CPU0=y is the reason for the warning.
As Jürgen suggested in another mail, Xen should probably disable hotplugging
for cpu#0 in the generic setup code. Then cpu_is_hotpluggable(cpu) would
do the right thing.

Do you want me to merge that extra change into this patch?

Olaf

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