linux-kernel - Re: [patch] generic-ipi: fix the smp

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Message-ID: <20081031093924.GG30317@elte.hu>
Date:	Fri, 31 Oct 2008 10:39:24 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Suresh Siddha <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


* 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.

	Ingo
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