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Message-ID: <490A9337.6090504@goop.org> Date: Fri, 31 Oct 2008 16:10:15 +1100 From: Jeremy Fitzhardinge <jeremy@...p.org> To: Suresh Siddha <suresh.b.siddha@...el.com> CC: Ingo Molnar <mingo@...e.hu>, "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 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. J -- 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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