Re: [PATCH] [media] media: Kconfig: add dependency of HAS_DMA

[Sudip Mukherjee]

Hi Mauro,
  
On Thu, Jan 14, 2016 at 10:46:59AM +0200, Sakari Ailus wrote:
> 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:
> > >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@xxxxxxxxxxxxxxx>
> > >>>---
> > >>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@xxxxxxxxxxxxxxx>

I got an update from patchwork that it has been accepted, but I still do
not see it in linux-next or in rc2. m32r allmodconfig build still fails.
build log of next-20160203 is at
https://travis-ci.org/sudipm-mukherjee/parport/jobs/106657434

regards
sudip