Hi Marek and Sudip,

On Wed, Jan 13, 2016 at 03:36:39PM +0100, Marek Szyprowski wrote:

Hello,

On 2016-01-12 15:10, Sakari Ailus wrote:

quoted

On Mon, Jan 11, 2016 at 06:23:11PM +0530, Sudip Mukherjee wrote:

quoted

On Wed, Dec 30, 2015 at 06:56:03PM +0530, Sudip Mukherjee wrote:

quoted

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 <redacted>
---

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.

VIDEOBUF2_DMA_CONTIG already depends on HAS_DMA, but when driver use select
directive for enabling support for VIDEOBUF2_DMA_CONTIG, the dependencies
are not checked further. This is known limitation/feature of kconfig system.

Thanks for the insight. Sounds like this is the right thing to do then.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>

-- 
Kind regards,

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