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Date: Fri, 31 Oct 2008 09:53:36 -0700 From: Suresh Siddha <suresh.b.siddha@...el.com> To: Jeremy Fitzhardinge <jeremy@...p.org> Cc: Ingo Molnar <mingo@...e.hu>, "Siddha, Suresh B" <suresh.b.siddha@...el.com>, "jens.axboe@...cle.com" <jens.axboe@...cle.com>, "paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>, "nickpiggin@...oo.com.au" <nickpiggin@...oo.com.au>, "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Mallick, Asit K" <asit.k.mallick@...el.com> Subject: Re: [patch] generic-ipi: fix the smp_mb() placement On Fri, Oct 31, 2008 at 04:12:32AM -0700, Jeremy Fitzhardinge wrote: > Ingo Molnar wrote: > > * Jeremy Fitzhardinge <jeremy@...p.org> 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. No. I am referring to Xen hypervisor code fix recently done by the Xen team in the Intel. http://xenbits.xensource.com/xen-unstable.hg?rev/50170dc8649c thanks, suresh -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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