linux-kernel - Re: [-mm patch] enforce noreplace-smp in alternative

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Date:	Thu, 23 Aug 2007 23:46:52 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Frederik Deweerdt <deweerdt@...e.fr>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...e.de>
Subject: Re: [-mm patch] enforce noreplace-smp in alternative_instructions()

Frederik Deweerdt wrote:
> That means that even when you specify noreplace_smp, some replacing
> takes place anyway. One of the consequences, besides noreplace_smp not
> working as expected, is that lguest crashes when you feed it an SMP kernel
> (I suspect that you can not replace alternatives for smp _and_ paravirt).
>   

No, that should be fine.  Why does lguest crash?

> I agree, but I don't think it is doable (alt_smp_once comes to mind). I'll
> double check however.

Hm.  Is alt_smp_once useful?

    J
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