linux-kernel - Re: [PATCH 02/10] init: move setup of nr_cpu

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Date:	Wed, 26 Mar 2008 11:22:14 -0700
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Tony Luck <tony.luck@...el.com>,
	Paul Mackerras <paulus@...ba.org>,
	Anton Blanchard <anton@...ba.org>,
	"David S. Miller" <davem@...emloft.net>,
	"William L. Irwin" <wli@...omorphy.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 02/10] init: move setup of nr_cpu_ids to as early as	possible
 v2

Ingo Molnar wrote:
> * Mike Travis <travis@....com> wrote:
> 
>> Ingo Molnar wrote:
>>> * Mike Travis <travis@....com> wrote:
>>>
>>>> Move the setting of nr_cpu_ids from sched_init() to 
>>>> setup_per_cpu_areas(), so that it's available as early as possible.
>>> hm, why not a separate call before setup_per_cpu_areas(), so that we can 
>>> avoid spreading this from generic kernel into a bunch of architectures 
>>> that happen to have their own version of setup_per_cpu_areas():
>>>
>>>>  7 files changed, 43 insertions(+), 15 deletions(-)
>>> 	Ingo
>> I had this before but I then discovered that an arch would increase 
>> (and possible decrease) it's number of possible cpus in 
>> setup_per_cpu_areas(). So I figured that setting nr_cpu_ids (and the 
>> cpumask_of_cpu map) should be a side effect of setup_per_cpu_areas().
> 
> well, then why not do it shortly after setup_per_cpu_areas()? That still 
> moves it earlier than sched_init() but doesnt export all this code and 
> complexity toevery setup_per_cpu_areas() implementation. (which clearly 
> didnt need this complexity before)
> 
> 	Ingo


Ok, will do.

Thanks,
Mike
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