[Devel] Re: [PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races

[Ingo Molnar]

* Paulo Marques <pmarques at 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