Re: [PATCH v2] core, x86: Add user return notifiers

[Avi Kivity]

On 09/22/2009 07:55 PM, Peter Zijlstra wrote:
> > If you're using lockdep, surely that's not your biggest worry?
> >      
> No, but that's all under #ifdef and fully disappears when not enabled.
> Generic return-tu-user notifiers don't sound like they will though.
>    

They will if not selected.  If selected and not armed, they will have 
zero runtime impact since they piggyback on existing branches 
(_TIF_DO_NOTIFY_MASK and near relatives).  If selected and armed they'll 
cause __switch_to_xtra() on every context switch and do_notity_resume() 
on syscall exit until disarmed, but then you've asked for it.

--
error compiling committee.c: too many arguments to function

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