linux-kernel - Re: [PATCH] Remove CONFIG_PM altogether, enable power management all the time

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Message-ID: <4D52E441.2000805@am.sony.com>
Date:	Wed, 09 Feb 2011 11:00:17 -0800
From:	Frank Rowand <frank.rowand@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Len Brown <len.brown@...el.com>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-embedded@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] Remove CONFIG_PM altogether, enable power management
 all the time

On 02/09/11 10:40, Mark Brown wrote:
> On Wed, Feb 09, 2011 at 10:31:29AM -0800, Frank Rowand wrote:
> 
>> Raphael's patch will turn on CONFIG_PM in the correct circumstances, and
>> leave it off when not needed by other config options.  That means that
>> the size overhead will _not_ be an issue for me because CONFIG_PM
>> will not be enabled when not needed.
> 
> That's not the issue you seemed to be raising, though.  While PM is now
> turned on by PM_SLEEP that'll end up getting turned on by default due to
> the dependency on SUSPEND - you appeared to be raising the concern that
> this could happen and surprise users.

No, that is not my concern.  I was saying that Raphael's patches do
not trigger any concern from me.

My concern was that in your very first email that started this thread,
you wrote:

On 02/07/11 04:22, Mark Brown wrote:
> It is very rare to find a current system which is both sufficiently
> resource constrained to want to compile out power management support
> and sufficiently power insensitive to be able to tolerate doing so.
> Since having the configuration option requires non-zero effort to
> maintain, with ifdefery in most drivers, but it is used with vanishing
> rarity it is simpler to just remove the option.

and my understanding of this proposal was a goal to remove the ability
to have CONFIG_PM disabled, which results in increased memory usage
for some configurations.

-Frank
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