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Re: [PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races [message #11287 is a reply to message #11286]

Fri, 16 March 2007 16:18

Ingo Molnar
Messages: 51
Registered: December 2005

Member

* Paulo Marques <pmarques@grupopie.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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[Message index]

		[PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races By: Alexey Dobriyan on Fri, 16 March 2007 11:39
		Re: [PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races By: Ingo Molnar on Fri, 16 March 2007 11:51
		Re: [PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races By: Paulo Marques on Fri, 16 March 2007 16:16
		Re: [PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races By: Ingo Molnar on Fri, 16 March 2007 16:18
		Re: [PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races By: Paulo Marques on Fri, 16 March 2007 17:16
		Re: [PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races By: Andrew Morton on Fri, 16 March 2007 18:15
		Re: [PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races By: Paulo Marques on Fri, 16 March 2007 20:27
		Re: [PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races By: Andrew Morton on Fri, 16 March 2007 20:49
		Re: [PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races By: Rusty Russell on Sat, 17 March 2007 10:36
		Re: [PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races By: Alexey Dobriyan on Mon, 19 March 2007 09:50
		Re: [PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races By: Rusty Russell on Sat, 17 March 2007 09:37
		Re: [PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races By: Alexey Dobriyan on Mon, 19 March 2007 10:14
		Re: [PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races By: Paulo Marques on Mon, 19 March 2007 15:17
		Re: [PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races By: Rusty Russell on Mon, 19 March 2007 23:23
		Re: [PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races By: Rusty Russell on Sat, 17 March 2007 09:32

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