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

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Message-ID: <45D2E9B3.8080008@suse.de>
Date:	Wed, 14 Feb 2007 11:51:31 +0100
From:	Gerd Hoffmann <kraxel@...e.de>
To:	vgoyal@...ibm.com
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?

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.

cheers,
  Gerd

-- 
Gerd Hoffmann <kraxel@...e.de>
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