Re: [PATCH] lglock: make lg_lock_global() actually lock globally

Peter Zijlstra
2010-08-26T11:49:33Z

On Thu, 2010-08-26 at 13:45 +0200, Peter Zijlstra wrote:
> On Thu, 2010-08-26 at 21:38 +1000, Nick Piggin wrote:
> > I think for CPU plug, stop_machine is reasonable (especially
> > considering it is required in unload, which means any frequent
> > amount of cpu plug activity already will require stop_machine to
> > run anyway).
>
> How is it required?
>
> Its currently implemented as such, and its sure a lot easier to do that
> way, but I could imagine that unplugging a CPU could be done without it.

Not that reworking unplug to not use stop_machine is anywhere near my
todo list, but it would be really nice to have ;-)