linux-kernel - Re: [PATCH v12 05/11] edma: config: Enable config options for EDMA

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Date:	Fri, 21 Jun 2013 13:40:48 -0500
From:	Joel A Fernandes <agnel.joel@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Sekhar Nori <nsekhar@...com>, Joel A Fernandes <joelagnel@...com>,
	Tony Lindgren <tony@...mide.com>,
	Matt Porter <matt@...orter.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Benoit Cousson <b-cousson@...com>,
	Russell King <linux@....linux.org.uk>,
	Rob Landley <rob@...dley.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jason Kridner <jkridner@...gleboard.org>,
	Koen Kooi <koen@...gleboard.org>,
	Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Documentation List <linux-doc@...r.kernel.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Linux SPI Devel List 
	<spi-devel-general@...ts.sourceforge.net>
Subject: Re: [PATCH v12 05/11] edma: config: Enable config options for EDMA

On Fri, Jun 21, 2013 at 9:32 AM, Arnd Bergmann <arnd@...db.de> wrote:
> On Friday 21 June 2013, Joel A Fernandes wrote:
>> I haven't come across this problem but- are you saying there is a
>> shortcoming in Kbuild/Kconfig that selects an option even if its
>> dependency is not met?
>
> Well, the shortcoming is that it lets you specify impossible
> contraints. You get a warning from Kconfig when building
> such a configuration, but then it continues.
>
>> The problem with defconfig is also too many options I feel for a common case.
>> CONFIG_DMADEVICES=y
>> CONFIG_TI_EDMA=y
>>
>> Most if not all future OMAPs from will use EDMA. Why not we can be
>> explicit about it and just built it in anyway. If ARCH_OMAP and
>> DMADEVICES are selected, then we can just build EDMA in by default.
>
> It's just not how we do things. Kconfig is a mess because we are
> not consistent in the way this is done.
>
>> I agree maybe the option can be dropped from Davinci but I suggest
>> let's keep it for OMAP. Is that ok?
>
> No, I would still like you to not add it to either one. I'm spending
> a lot of my time tracking down incorrect 'select' statements and I'd
> rather spend it in a different way. I've had to a number of 'select'
> statements from OMAP in the past, please don't add any new ones
> unless there is a strict build dependency (which normally should not
> exist).

I think we are talking about different things, I agree the 'select
DMADEVICES' can be dropped but lets please keep the default y option
(not adding new select statements, just saying that if someone select
DMADEVICES in menuconfig and if they're ARCH_OMAP=1 , then default to
EDMA). This will simply allow people to have a default. Thanks.

Thanks
Joel
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