From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomi Valkeinen Subject: Re: [PATCH 2/2] video: omap2: Compile omap2 support only when needed Date: Tue, 21 Jun 2011 08:24:53 +0300 Message-ID: <1308633893.1850.11.camel@deskari> References: <1308566761-2850-1-git-send-email-tushar.behera@linaro.org> <1308566761-2850-3-git-send-email-tushar.behera@linaro.org> <1308575201.2076.57.camel@deskari> <4E0022B5.9000500@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4E0022B5.9000500-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linaro-dev-bounces-cunTk1MwBs8s++Sfvej+rw@public.gmane.org Errors-To: linaro-dev-bounces-cunTk1MwBs8s++Sfvej+rw@public.gmane.org To: Tushar Behera Cc: linux-fbdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org, patches-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, lethal-M7jkjyW5wf5g9hUCZPvPmw@public.gmane.org, Tomi Valkeinen , linaro-dev-cunTk1MwBs8s++Sfvej+rw@public.gmane.org, linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: linux-omap@vger.kernel.org On Tue, 2011-06-21 at 10:18 +0530, Tushar Behera wrote: > Hi, > > On Monday 20 June 2011 06:36 PM, Tomi Valkeinen wrote: > > On Mon, 2011-06-20 at 16:16 +0530, Tushar Behera wrote: > >> Currently display support for omap2 is selected by default and > >> it gets built for all the configurations. > >> > >> Instead of it being a built-in feature, it's compilation should > >> depend on the config option CONFIG_FB_OMAP2. > > > > No, I don't think so. omap2 directory contains vram, vrfb and omapdss, > > all of which can be used without omapfb driver. vram and vrfb can be > > even used without omapdss driver. > Even if I build the kernel with i386_defconfig, I get some compiled > files within drivers/video/omap2. > > $ make ARCH=x86 i386_defconfig O=out_dir > $ make ARCH=x86 O=out_dir > > $ ls out_dir/drivers/video/omap2 > built-in.o displays modules.builtin modules.order > > IMHO, drivers/video/omap2/ should not be compiled if the kernel is not > built for omap2. Ok. Yes, that's a known "problem". We could have a OMAPx check there, but then again, the driver is a driver for the DSS HW, which could, at least in theory, used in other SoCs. I don't think any driver should normally depend on ARCH_something or MACH_something. I think this is more of a "problem" with the build system. The same thing can be seen with, for example, drivers/video/backlight/ and drivers/video/display/ directories. In practice the created files do not affect the kernel in any way, as far as I see. Tomi