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

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Date:	Tue, 4 Nov 2008 10:19:56 +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:

> 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.

	Ingo
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