linux-kernel - Re: [PATCH v5 2/5] powerpc/85xx: add HOTPLUG

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Date:	Tue, 5 Jun 2012 11:15:52 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Zhao Chenhui <chenhui.zhao@...escale.com>
CC:	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
	<galak@...nel.crashing.org>, <leoli@...escale.com>
Subject: Re: [PATCH v5 2/5] powerpc/85xx: add HOTPLUG_CPU support

On 06/05/2012 06:18 AM, Zhao Chenhui wrote:
> On Mon, Jun 04, 2012 at 11:32:47AM -0500, Scott Wood wrote:
>> On 06/04/2012 06:04 AM, Zhao Chenhui wrote:
>>> On Fri, Jun 01, 2012 at 04:27:27PM -0500, Scott Wood wrote:
>>>> On 05/11/2012 06:53 AM, Zhao Chenhui wrote:
>>>>> -#ifdef CONFIG_KEXEC
>>>>> +#if defined(CONFIG_KEXEC) || defined(CONFIG_HOTPLUG_CPU)
>>>>
>>>> Let's not grow lists like this.  Is there any harm in building it
>>>> unconditionally?
>>>>
>>>> -Scott
>>>
>>> We need this ifdef. We only set give_timebase/take_timebase
>>> when CONFIG_KEXEC or CONFIG_HOTPLUG_CPU is defined.
>>
>> If we really need this to be a compile-time decision, make a new symbol
>> for it, but I really think this should be decided at runtime.  Just
>> because we have kexec or hotplug support enabled doesn't mean that's
>> actually what we're doing at the moment.
>>
>> -Scott
> 
> If user does not enable kexec or hotplug, these codes are redundant.
> So use CONFIG_KEXEC and CONFIG_HOTPLUG_CPU to gard them.

My point is that these lists tend to grow and be a maintenance pain.
For small things it's often better to not worry about saving a few
bytes.  For larger things that need to be conditional, define a new
symbol rather than growing ORed lists like this.

-Scott

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