linux-kernel - Re: Will smp alternative try to patch init text also?

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Message-ID: <20070214111209.GB3393@in.ibm.com>
Date:	Wed, 14 Feb 2007 16:42:09 +0530
From:	Vivek Goyal <vgoyal@...ibm.com>
To:	Gerd Hoffmann <kraxel@...e.de>
Cc:	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@....de>
Subject: Re: Will smp alternative try to patch init text also?

On Wed, Feb 14, 2007 at 11:51:31AM +0100, Gerd Hoffmann wrote:
> Vivek Goyal wrote:
> > So what happens if somebody builds a SMP kernel and runs on a UP machine.
> > Later it hotplus one CPU. Then kernel will switch to SMP mode. Looking
> > at the code it looks like it will also try to patch init text which is
> > no more there and will corrupt something else? 
> 
> There are range checks for both kernel (_text -> _etext) and modules
> (.text section).  Anything outside isn't patched.
> 

Oh... I missed that. Thanks.

Vivek
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