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

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Message-ID: <20070302072348.GC21694@verge.net.au>
Date:	Fri, 2 Mar 2007 16:23:48 +0900
From:	Horms <horms@...ge.net.au>
To:	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org, judith@...ux-foundation.org,
	fastboot@...ts.osdl.org, ebiederm@...ssion.com, ak@...e.de
Subject: Re: [Fastboot] [PATCH RFC 0/5] hard_smp_processor_id overhaul

On Thu, Mar 01, 2007 at 04:16:13PM +0900, Fernando Luis Vázquez Cao wrote:
> With the advent of kdump, the assumption that the boot CPU when running
> an UP kernel is always the CPU with a hardware ID of 0 (usually referred
> to as BSP on some architectures) does not hold true anymore. The reason
> being that the dump capture kernel boots on the crashed CPU (the CPU
> that invoked crash_kexec).
> 
> 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.
> 
> 2- Ask the hardware when possible to obtain the hardware processor id on
> i386, x86_64, and ia64, independently of whether CONFIG_SMP is set or
> not.
> 
> 3- Move definition of hard_smp_processor_id for the UP case to asm/smp.h
> on alpha, m32r, powerpc, s390, sparc, sparc64, and um architectures. I
> guess that hardware features could be used to implement
> hard_smp_processor_id even in the UP case, but since I am not an expert
> in this architectures I just move the definition.
> 
> The patches have been tested on i386, x86_64, and ia64.

Hi Fernando,

These patches seem find to me. Tested on ia64 (Tiger2)

Acked: Simon Horman <horms@...ge.net.au>
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