linux-kernel - Re: [patch 3/5] [PATCH 3/5] x86: Run Intel ucode-updates via workqueue.

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Date:	Wed, 6 Aug 2008 13:45:22 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Max Krasnyansky <maxk@...lcomm.com>
Cc:	Peter Oruba <peter.oruba@....com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Tigran Aivazian <tigran@...azian.fsnet.co.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch 3/5] [PATCH 3/5] x86: Run Intel ucode-updates via
 workqueue.

On Wed, 06 Aug 2008 13:31:18 -0700
Max Krasnyansky <maxk@...lcomm.com> wrote:

> Arjan van de Ven wrote:
> > On Wed, 6 Aug 2008 17:21:20 +0200
> > Peter Oruba <peter.oruba@....com> wrote:
> > 
> > [ no description or reason ]
> > 
> > Why is this?
> > 
> > I'm not very happy about this.. it means practically that this stuff
> > *has* to run late. Probably later than we want to.
> > (Like.. we may want to redo the microcode during resume.. which is
> > not a schedulable context)
> 
> Dmitry and I tried to figure out how soon does it need to run.

you're not going to like the answer, but it's "as soon as possible".
Unlike normal boot, hotplug is a case where the bios hasn't been able
to put a normal microcode in. 

> Nobody had a strong argument why it must run synchronously in the 
> hotplug path.

Ok we as Intel really want it as early as possible.

> Sure we want it as soon as possible and I'd say
> workqueue is soon enough.
> Existing hotplug path does not guaranty any ordering and original 
> microcode interface was driven from user-space. So clearly it was not 
> considered very critical.

well that's why it changed to no longer use the userspace driven thing..


> 
> Max


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