linux-kernel - Re: [PATCH] [media] media: Kconfig: add dependency of HAS

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Date:	Tue, 12 Jan 2016 16:10:43 +0200
From:	Sakari Ailus <sakari.ailus@....fi>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>, hverkuil@...all.nl,
	pawel@...iak.com, m.szyprowski@...sung.com,
	kyungmin.park@...sung.com
Subject: Re: [PATCH] [media] media: Kconfig: add dependency of HAS_DMA

On Mon, Jan 11, 2016 at 06:23:11PM +0530, Sudip Mukherjee wrote:
> On Wed, Dec 30, 2015 at 06:56:03PM +0530, Sudip Mukherjee wrote:
> > The build of m32r allmodconfig fails with the error:
> > drivers/media/v4l2-core/videobuf2-dma-contig.c:484:2:
> > 	error: implicit declaration of function 'dma_get_cache_alignment'
> > 
> > The build of videobuf2-dma-contig.c depends on HAS_DMA and it is
> > correctly mentioned in the Kconfig but the symbol VIDEO_STI_BDISP also
> > selects VIDEOBUF2_DMA_CONTIG, so it is trying to compile
> > videobuf2-dma-contig.c even though HAS_DMA is not defined.
> > 
> > Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
> > ---
> 
> A gentle ping. m32r allmodconfig still fails with next-20160111. Build
> log is at:
> https://travis-ci.org/sudipm-mukherjee/parport/jobs/101536379

Hi Sudip,

Even though the issue now manifests itself on m32r, the problem is wider
than that: dma_get_cache_alignment() is only defined if CONFIG_HAS_DMA is
set.

I wonder if using videobuf2-dma-contig makes any sense if HAS_DMA is
disabled, so perhaps it'd be possible to make it depend on HAS_DMA.

Cc others.

-- 
Kind regards,

Sakari Ailus
e-mail: sakari.ailus@....fi	XMPP: sailus@...iisi.org.uk