linux-kernel - Re: [Fastboot] [PATCH RFC 0/5] hard_smp_processor

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Message-Id: <1172822794.6025.11.camel@sebastian.intellilink.co.jp>
Date:	Fri, 02 Mar 2007 17:06:34 +0900
From:	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>
To:	vgoyal@...ibm.com
Cc:	Benjamin LaHaise <bcrl@...ck.org>, ebiederm@...ssion.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	fastboot@...ts.osdl.org, ak@...e.de, akpm@...ux-foundation.org,
	judith@...ux-foundation.org
Subject: Re: [Fastboot] [PATCH RFC 0/5] hard_smp_processor_id overhaul

On Fri, 2007-03-02 at 09:44 +0530, Vivek Goyal wrote:
> On Thu, Mar 01, 2007 at 09:06:48AM -0500, Benjamin LaHaise wrote:
> > On Thu, Mar 01, 2007 at 04:16:13PM +0900, Fernando Luis Vázquez Cao wrote:
> > > As a consequence, the hardcoding of hard_smp_processor_id() to 0 on UP
> > > systems (see "linux/smp.h") is not correct.
> > > 
> > > This patch-set does the following:
> > > 
> > > 1- Remove hardcoding of hard_smp_processor_id on UP systems.
> > 
> > NAK.  This has to be configurable, as many embedded systems don't even 
> > have APICs.  Please rework the patch set so that there is not any overhead 
> > for existing UP systems.
> 
> Fernando did the code audit and found no instance of hard_smp_processor_id
> being used for non APIC case. So are embedded systems you are referring,
> patching the kernel?
> 
> Anyway, I think providing hard_smp_processor_id() definition for UP systems
> without APIC does not harm.
Hi Vivek,

I am replying to this email with a patch that does exactly that.

Thanks,
Fernando

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