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

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Message-ID: <20180911124808.18dfe8bf.olaf@aepfle.de>
Date:   Tue, 11 Sep 2018 12:48:08 +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 Tue, 11 Sep 2018 09:52:58 +0200
schrieb Olaf Hering <olaf@...fle.de>:

> 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.

The relevant code is all private to arch/x86/kernel/topology.c.
There is no way to set .hotpluggable prior to register_cpu.
I guess you need to work that out with the x86 maintainers.

Olaf

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