Re: [patch] generic-ipi: fix the smp_mb() placement

[Jeremy Fitzhardinge]

Ingo Molnar wrote:
> * Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
>
>   
> > Suresh Siddha wrote:
> >     
> > > We didn't see the lockup in our tests but Xen folks reported similar failures
> > > with their smp call function code.
> > >   
> > >       
> > ...really?  I don't remember anything like that, but perhaps I'm 
> > forgetting something.  In Xen the IPI is sent with a hypercall, 
> > which is definitely a solid enough barrier for these purposes.
> >     
>
> i think Suresh might be referring to some of the fragilities Xen had 
> with generic-ipi. But those AFAICT were due to the on-stack lifetime 
> bug that Nick fixed via the kmalloc? v2.6.26-ish issue.

Right, that's all I could think of.

   J
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