Re: [PATCH 11/26] media: videobuf2-v4l2: Support vb2_queue embedded in a context

[kernel test robot <lkp@intel.com>]

Hi Jacopo,

kernel test robot noticed the following build errors:

[auto build test ERROR on d968e50b5c26642754492dea23cbd3592bde62d8]

url:    https://github.com/intel-lab-lkp/linux/commits/Jacopo-Mondi/media-mc-Add-per-file-handle-data-support/20250717-190546
base:   d968e50b5c26642754492dea23cbd3592bde62d8
patch link:    https://lore.kernel.org/r/20250717-multicontext-mainline-2025-v1-11-81ac18979c03%40ideasonboard.com
patch subject: [PATCH 11/26] media: videobuf2-v4l2: Support vb2_queue embedded in a context
config: x86_64-buildonly-randconfig-004-20250718 (https://download.01.org/0day-ci/archive/20250718/202507181803.MKWlcVqu-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250718/202507181803.MKWlcVqu-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202507181803.MKWlcVqu-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/media/common/videobuf2/videobuf2-v4l2.c:1012:5: error: call to undeclared function 'video_device_context_from_file'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1012 |                                 video_device_context_from_file(file, vdev);
         |                                 ^
>> drivers/media/common/videobuf2/videobuf2-v4l2.c:1011:31: error: incompatible integer to pointer conversion initializing 'struct video_device_context *' with an expression of type 'int' [-Wint-conversion]
    1011 |         struct video_device_context *ctx =
         |                                      ^
    1012 |                                 video_device_context_from_file(file, vdev);
         |                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/media/common/videobuf2/videobuf2-v4l2.c:1014:19: error: incomplete definition of type 'struct video_device_context'
    1014 |         return ctx ? &ctx->queue
         |                       ~~~^
   include/media/v4l2-dev.h:288:9: note: forward declaration of 'struct video_device_context'
     288 |         struct video_device_context *default_context;
         |                ^
   drivers/media/common/videobuf2/videobuf2-v4l2.c:1015:54: error: incomplete definition of type 'struct video_device_context'
    1015 |                    : vdev->default_context ? &vdev->default_context->queue
         |                                               ~~~~~~~~~~~~~~~~~~~~~^
   include/media/v4l2-dev.h:288:9: note: forward declaration of 'struct video_device_context'
     288 |         struct video_device_context *default_context;
         |                ^
   4 errors generated.


vim +/video_device_context_from_file +1012 drivers/media/common/videobuf2/videobuf2-v4l2.c

   992	
   993	/*
   994	 * The following functions are not part of the vb2 core API, but are helper
   995	 * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations
   996	 * and struct vb2_ops.
   997	 * They contain boilerplate code that most if not all drivers have to do
   998	 * and so they simplify the driver code.
   999	 */
  1000	
  1001	/*
  1002	 * Helper to get the vb2 queue either from:
  1003	 * 1) The video context bound to the open file handle
  1004	 * 2) The default context for context-aware drivers if userspace has not bound
  1005	 *    a context to the file handle
  1006	 * 3) From the video device for non-context aware drivers
  1007	 */
  1008	static struct vb2_queue *get_vb2_queue(struct file *file,
  1009					       struct video_device *vdev)
  1010	{
> 1011		struct video_device_context *ctx =
> 1012					video_device_context_from_file(file, vdev);
  1013	
> 1014		return ctx ? &ctx->queue
  1015			   : vdev->default_context ? &vdev->default_context->queue
  1016			   : vdev->queue;
  1017	}
  1018	

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