linux-kernel - Re: [PATCH RESEND 2/2] Fix some kallsyms

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Date:	Fri, 16 Mar 2007 17:18:53 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Paulo Marques <pmarques@...popie.com>
Cc:	Alexey Dobriyan <adobriyan@...ru>, akpm@...l.org,
	linux-kernel@...r.kernel.org, devel@...nvz.org, tglx@...utronix.de,
	viro@...iv.linux.org.uk, rusty@...tcorp.com.au
Subject: Re: [PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races


* Paulo Marques <pmarques@...popie.com> wrote:

> >looking at the problem from another angle: wouldnt this be something 
> >that would benefit from freeze_processes()/unfreeze_processes(), and 
> >hence no locking would be required?
> 
> I also considered this, but it seemed a little too "blunt" to stop 
> everything (including completely unrelated processes and kernel 
> threads) just to remove a module.

'just to remove a module' is very, very rare, on the timescale of most 
kernel ops. Almost no distro does it. Furthermore, because we want to do 
CPU-hotplug that way, we really want to make 
freeze_processes()/unfreeze_processes() 'instantaneous' to the human - 
and it is that already. (if it isnt in some case we can make it so)

	Ingo
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