linux-kernel - Re: [PATCH] x86: fix cpu-hotplug regression

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Message-Id: <200711070335.44416.ak@suse.de>
Date:	Wed, 7 Nov 2007 03:35:43 +0100
From:	Andi Kleen <ak@...e.de>
To:	"Andreas Herrmann" <andreas.herrmann3@....com>
Cc:	"Thomas Gleixner" <tglx@...utronix.de>,
	"Ingo Molnar" <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org,
	"Akinobu Mita" <akinobu.mita@...il.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: [PATCH] x86: fix cpu-hotplug regression

On Wednesday 07 November 2007 02:12, Andreas Herrmann wrote:

> In cases where not all CPUs are brought up during
> boot (e.g. using maxcpus and additional_cpus parameters)
> mce_cpu_callback now returns NOTFIY_BAD because
> for such CPUs cpu_data is not completely filled when
> the notifier is called. Thus mce_create_device fails right
> at its beginning:
>
>         if (!mce_available(&cpu_data[cpu]))
>                 return -EIO;
>
> As a quick fix I suggest to check boot_cpu_data for MCE.

I guess it would be better to just move the device creation
to after the CPU has booted. AKA call mce_create_dev() on CPU_ONLINE
instead.

-Andi
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