linux-kernel - Re: [PATCH] build some drivers only when compile-testing

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Date:	Thu, 23 May 2013 10:46:57 +0300
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	Jiri Slaby <jslaby@...e.cz>
CC:	<jirislaby@...il.com>, <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jeff Mahoney <jeffm@...e.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>,
	Florian Tobias Schandinat <FlorianSchandinat@....de>,
	<linux-geode@...ts.infradead.org>, <linux-fbdev@...r.kernel.org>,
	Richard Cochran <richardcochran@...il.com>,
	<netdev@...r.kernel.org>, Ben Hutchings <ben@...adent.org.uk>,
	"Keller, Jacob E" <jacob.e.keller@...el.com>
Subject: Re: [PATCH] build some drivers only when compile-testing

Hi,

On 22/05/13 12:18, Jiri Slaby wrote:
> Some drivers can be built on more platforms than they run on. This
> causes users and distributors packaging burden when they have to
> manually deselect some drivers from their allmodconfigs. Or sometimes
> it is even impossible to disable the drivers without patching the
> kernel.
> 
> Introduce a new config option COMPILE_TEST and make all those drivers
> to depend on the platform they run on, or on the COMPILE_TEST option.
> Now, when users/distributors choose COMPILE_TEST=n they will not have
> the drivers in their allmodconfig setups, but developers still can
> compile-test them with COMPILE_TEST=y.
> 
> Now the drivers where we use this new option:
> * PTP_1588_CLOCK_PCH: The PCH EG20T is only compatible with Intel Atom
>   processors so it should depend on x86.
> * FB_GEODE: Geode is 32-bit only so only enable it for X86_32.
> * USB_CHIPIDEA_IMX: The OF_DEVICE dependency will be met on powerpc
>   systems -- which do not actually support the hardware via that
>   method.

I had this exact same idea some time ago. The mail below contains some
of my reasoning for this:

http://comments.gmane.org/gmane.linux.kbuild.devel/9829

I proposed a new Kconfig keyword, but Sam was quite against it as the
Kconfig language already does what is required.

 Tomi



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