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

[Ingo Molnar]

* 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.

	Ingo
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