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

[Peter Zijlstra]

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 ;-)
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