linux-kernel - Re: [PATCH 0/7] media: atomisp: Address several clang warnings

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Message-ID: <20200527192036.2575daf5@coco.lan>
Date:   Wed, 27 May 2020 19:20:36 +0200
From:   Mauro Carvalho Chehab <mchehab@...nel.org>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Sakari Ailus <sakari.ailus@...ux.intel.com>,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH 0/7] media: atomisp: Address several clang warnings

Em Wed, 27 May 2020 09:45:21 -0700
Nathan Chancellor <natechancellor@...il.com> escreveu:

> On Wed, May 27, 2020 at 10:45:25AM +0200, Mauro Carvalho Chehab wrote:
> > Em Wed, 27 May 2020 00:11:43 -0700
> > Nathan Chancellor <natechancellor@...il.com> escreveu:
> >   
> > > Hi all,
> > > 
> > > This series aims to clean up the code while addressing the majority of
> > > clang warnings in this driver, some found by the 0day bot and others
> > > found by me.
> > > 
> > > There are several enum conversion warnings that happen, which I do not
> > > really know how to solve without understanding how exactly this driver
> > > works. I would appreciate some guidance or a solution. Below are the
> > > warnings, sorry for not wrapping them but they would be hard to read
> > > otherwise.  
> > 
> > ...   
> > > ../drivers/staging/media/atomisp//pci/atomisp_compat_css20.h:117:22: note: expanded from macro 'CSS_ID'
> > > #define CSS_ID(val)     (IA_ ## val)  
> > ...
> > 
> > I actually wrote a patch getting rid of this ugly thing:
> > 
> > 	https://git.linuxtv.org/mchehab/experimental.git/commit/?h=atomisp_v3&id=cf6a15543ace1e99364911c0b7a2f6b8f2f43021
> > 
> > This one was already submitted upstream (not merged yet), but there
> > are also lots of other patches on my working tree.  
> 
> Ah excellent, that makes the warnings a lot more readable. I am still
> not sure how to reconcile the differences, it might be easier to just
> change the types in the struct to int.
> 
> ../drivers/staging/media/atomisp/pci/atomisp_subdev.c:49:68: warning: implicit conversion from enumeration type 'enum ia_css_frame_format' to different enumeration type 'enum atomisp_input_format' [-Wenum-conversion]
>         { V4L2_MBUS_FMT_CUSTOM_NV21, 12, 12, IA_CSS_FRAME_FORMAT_NV21, 0, IA_CSS_FRAME_FORMAT_NV21 },
>         ~                                                                 ^~~~~~~~~~~~~~~~~~~~~~~~
> ../drivers/staging/media/atomisp/pci/atomisp_subdev.c:49:39: warning: implicit conversion from enumeration type 'enum ia_css_frame_format' to different enumeration type 'enum atomisp_input_format' [-Wenum-conversion]
>         { V4L2_MBUS_FMT_CUSTOM_NV21, 12, 12, IA_CSS_FRAME_FORMAT_NV21, 0, IA_CSS_FRAME_FORMAT_NV21 },
>         ~                                    ^~~~~~~~~~~~~~~~~~~~~~~~
> ../drivers/staging/media/atomisp/pci/atomisp_subdev.c:48:68: warning: implicit conversion from enumeration type 'enum ia_css_frame_format' to different enumeration type 'enum atomisp_input_format' [-Wenum-conversion]
>         { V4L2_MBUS_FMT_CUSTOM_NV12, 12, 12, IA_CSS_FRAME_FORMAT_NV12, 0, IA_CSS_FRAME_FORMAT_NV12 },
>         ~                                                                 ^~~~~~~~~~~~~~~~~~~~~~~~
> ../drivers/staging/media/atomisp/pci/atomisp_subdev.c:48:39: warning: implicit conversion from enumeration type 'enum ia_css_frame_format' to different enumeration type 'enum atomisp_input_format' [-Wenum-conversion]
>         { V4L2_MBUS_FMT_CUSTOM_NV12, 12, 12, IA_CSS_FRAME_FORMAT_NV12, 0, IA_CSS_FRAME_FORMAT_NV12 },
>         ~                                    ^~~~~~~~~~~~~~~~~~~~~~~~
> ../drivers/staging/media/atomisp/pci/atomisp_subdev.c:47:34: warning: implicit conversion from enumeration type 'enum ia_css_frame_format' to different enumeration type 'enum atomisp_input_format' [-Wenum-conversion]
>         { MEDIA_BUS_FMT_JPEG_1X8, 8, 8, IA_CSS_FRAME_FORMAT_BINARY_8, 0, ATOMISP_INPUT_FORMAT_BINARY_8 },
>         ~                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 5 warnings generated.

Well, I guess we should just get rid of the duplication there,

> 
> > I'll try to apply your patch series on it, once I'll be able to
> > fix a bug with mmap support.  
> 
> It looks like all of them apply to your experimental branch aside from
> patch 3, which you handled in a different way.

Ok. I'll apply your patch series on my tree.

Thanks,
Mauro