linux-kernel - Re: [PATCH v9 03/12] x86, topology: Don't offline CPU0 if any PIC irq can not be migrated out of it

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Message-ID: <20121016170310.GC12694@x1.osrc.amd.com>
Date:	Tue, 16 Oct 2012 19:03:11 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Fenghua Yu <fenghua.yu@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	H Peter Anvin <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Asit K Mallick <asit.k.mallick@...el.com>,
	Tony Luck <tony.luck@...el.com>,
	Arjan Dan De Ven <arjan@...ux.intel.com>,
	Suresh B Siddha <suresh.b.siddha@...el.com>,
	Len Brown <len.brown@...el.com>,
	"Srivatssa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Chen Gong <gong.chen@...ux.intel.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-pm <linux-pm@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [PATCH v9 03/12] x86, topology: Don't offline CPU0 if any PIC
 irq can not be migrated out of it

On Fri, Oct 12, 2012 at 09:09:40AM -0700, Fenghua Yu wrote:
> From: Fenghua Yu <fenghua.yu@...el.com>
> 
> If CONFIG_BOOTPARAM_HOTPLUG_CPU is turned on, CPU0 hotplug feature is enabled
> by default.
> 
> If CONFIG_BOOTPARAM_HOTPLUG_CPU is not turned on, CPU0 hotplug feature is not
> enabled by default. The kernel parameter cpu0_hotplug can enable CPU0 hotplug
> feature at boot.
> 
> Currently the feature is supported on Intel platforms only.
> 
> Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
> ---
>  arch/x86/kernel/topology.c |   50 +++++++++++++++++++++++++++++++++++++------

It is just me or is this whole change better suited for

arch/x86/kernel/cpu/topology.c

where cpu-specific stuff lives anyway?

Thanks.

-- 
Regards/Gruss,
Boris.
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