linux-kernel - Re: [repost PATCH] Fix SMP alternatives : use mutex instead of spinlock, text

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Message-ID: <20080422202256.GA19639@Krystal>
Date:	Tue, 22 Apr 2008 16:22:57 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Pekka Paalanen <pq@....fi>, linux-kernel@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [repost PATCH] Fix SMP alternatives : use mutex instead of
	spinlock, text_poke is sleepable

* Ingo Molnar (mingo@...e.hu) wrote:
> 
> * Pekka Paalanen <pq@....fi> wrote:
> 
> > Ingo,
> > 
> > I see you applied the NX fix. This patch is the other one needed to 
> > make CPU hotplug working. Could you apply this, unless Mathieu has 
> > something against it?
> 
> sure, patch looks sane - applied it and pushed it out. Thanks,
> 
> 	Ingo

Ingo,

The patch found there should also be pulled (at least the
is_vmalloc_addr -> !core_kernel_text bit) :

http://lkml.org/lkml/2008/4/20/192

On x86_64, module code is not in is_vmalloc_addr range, so we can end up
using virt_to_page on module text addresses.

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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