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

[Suresh Siddha]

On Tue, Nov 04, 2008 at 02:19:56AM -0700, Ingo Molnar wrote:
> 
> * Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
> 
> > Ingo Molnar wrote:
> >> ok - so that makes it a v2.6.28 item i guess.
> >>   
> >
> > The case Suresh is talking about was a fix to Xen itself, rather 
> > than on the kernel side, so it doesn't need to be a .28 issue on 
> > Xen's account.
> 
> ok - but still the portion of the fix that strengthens barriers looks 
> obvious to have and there's little downside that i can see.
> 
> Suresh, you might want to split the patch(es) in two: get the barrier 
> strengthening changes into v2.6.28 (to fix the x2apic bug), while the 
> aspects that _weaken_ barriers can wait for v2.6.29.
> 
> With that it would be a 100% safe change for v2.6.28-rc4.

Ok. I just posted three patches (including the x86 specific change).

[patch 1/3] generic-ipi: add smp_mb() before sending the IPI
[patch 2/3] x86: Add smp_mb() before sending INVALIDATE_TLB_VECTOR
[patch 3/3] generic-ipi: fix the smp_mb() usage

First two patches are safe to go into v2.6.28. Third patch can wait for v2.6.29.

thanks,
suresh
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