linux-kernel - Re: [PATCH] [2/11] x86: Fix alternatives and kprobes to remap write-protected kernel text

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Message-ID: <20070724152018.GA31729@Krystal>
Date:	Tue, 24 Jul 2007 11:20:18 -0400
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, Andi Kleen <ak@...e.de>,
	jbeulich@...ell.com, zach@...are.com, patches@...-64.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [2/11] x86: Fix alternatives and kprobes to remap write-protected kernel text

* Jeremy Fitzhardinge (jeremy@...p.org) wrote:
> Mathieu Desnoyers wrote:
> > Hi Rusty,
> >
> > Good catch. I also still wonder why alternative (except alternative smp,
> > which is ok) and paravirt patching functions are not marked __init. I really
> > hope they are never used when NMI, MCE are enabled or when threads may
> > have been preempted in the site being patched, or it could result in an
> > illegal instruction.
> >   
> 
> We need to patch modules at load time.  Presumably an NMI/MCE handler
> will not depend on code in a being-loaded module.
> 
>     J
> 

Oh yes, I see. That's ok since the code of a being-loaded module is not
executed yet.

Thanks,

Mathieu

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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