linux-kernel - Re: [PATCH 2/2] time: remove the unnecessary CONFIG_GENERIC

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Message-ID: <20120106021248.GA2691@feng-i7>
Date:	Fri, 6 Jan 2012 10:12:48 +0800
From:	Feng Tang <feng.tang@...el.com>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <john.stultz@...aro.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] time: remove the unnecessary
 CONFIG_GENERIC_CLOCKEVENS check

Hi Paul, 

On Thu, Jan 05, 2012 at 12:17:46PM +0100, Paul Bolle wrote:
> On Thu, 2012-01-05 at 21:28 +0800, Feng Tang wrote:
> > In kernel/time/Kconfig:
> > config GENERIC_CLOCKEVENTS_BUILD
> > 	bool
> > 	default y
> > 	depends on GENERIC_CLOCKEVENTS
> > 
> > So there is no need to check CONFIG_GENERIC_CLOCKEVENTS if the
> > CONFIG_GENERIC_CLOCKEVENTS_BUILD is defined already.
> 
> This is only true because nothing selects GENERIC_CLOCKEVENTS_BUILD
> directly, isn't it?

Thanks for pointing this out, your concern is valid, even though there
will be a warning message about the dependency corruption if the
GENERIC_CLOCKEVENTS_BUILD is directly selected while the 
GENERIC_CLOCKEVENTS is N.

Thanks,
Feng

> So if we're being strict the patch explanation
> should mention that.
> 
> (Maybe it's even better to simply state
>     There is no need to check CONFIG_GENERIC_CLOCKEVENTS if
>     CONFIG_GENERIC_CLOCKEVENTS_BUILD is defined.
> 
>     This prepares [...]
> 
> as that would tell us just enough.)
> 
> > This prepares for the total removal of GENERIC_CLOCKEVENTS_BUILD.
> 
> 
> Paul Bolle
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