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

[H. Peter Anvin]

Ingo Molnar wrote:
> * Avi Kivity <avi@xxxxxxxxxx> wrote:
>
> > On 09/19/2009 09:40 AM, Avi Kivity wrote:
> > > Add a general per-cpu notifier that is called whenever the kernel is
> > > about to return to userspace.  The notifier uses a thread_info flag
> > > and existing checks, so there is no impact on user return or context
> > > switch fast paths.
> > >    
> > Ingo/Peter?
>
> Would be nice to convert some existing open-coded return-to-user-space 
> logic to this facility. One such candidate would be lockdep_sys_exit?
>
> 	Ingo

Sorry, limited bandwidth due to LinuxCon, but I like the concept, and 
the previous (partial) patch was really clean.  I agree with Ingo that 
arch support so we can use this as a general facility would be nice, but 
I don't consider that as a prerequisite for merging.

	-hpa

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