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Message-ID: <49818C7F.1030202@gmail.com>
Date: Thu, 29 Jan 2009 20:01:19 +0900
From: Tejun Heo <htejun@gmail.com>
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To: Jeremy Fitzhardinge <jeremy@goop.org>
CC: Brian Gerst <brgerst@gmail.com>, Ingo Molnar <mingo@elte.hu>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: unified percpu stuff
References: <497E5F76.10301@goop.org> <497E8AD4.7030702@gmail.com> <49818842.5020004@goop.org>
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Jeremy Fitzhardinge wrote:
> Tejun Heo wrote:
>> The current tj-percpu[1] contains Brian's commit which consolidates
>> load_gs_base() into switch_to_new_gdt(), 
> 
> There's a bit of a bootstrap problem using switch_to_new_gdt() on the
> boot CPU: it uses smp_processor_id, which ends up doing a
> percpu_read(cpu_number), which naturally crashes because %gs isn't set
> up yet.  Perhaps switch_to_new_gdt() should take the cpu number as a
> parameter (or at least a __switch_to_new_gdt variant which does).

Please feel free to submit a patch.  It being a pretty low level
function, I think it would be better to convert it to take cpu_number.

Thanks.

-- 
tejun
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