Hi Hans
On Thu, 10 Nov 2011, Hans Verkuil wrote:
> Hi Guennadi,
>
> The daily build gives these compiler warnings when compiling on a 64-bit
> platform:
>
> In file included from drivers/media/video/imx074.c:19:0:
> include/media/soc_camera.h: In function ‘soc_camera_i2c_to_vdev’:
> include/media/soc_camera.h:257:34: warning: cast to pointer from integer of
> different size [-Wint-to-pointer-cast]
> In file included from drivers/media/video/mt9m111.c:18:0:
> include/media/soc_camera.h: In function ‘soc_camera_i2c_to_vdev’:
> include/media/soc_camera.h:257:34: warning: cast to pointer from integer of
> different size [-Wint-to-pointer-cast]
Yes, this warnings have already been reported and yes, they should be
fixed.
> (and a whole bunch more of these warnings).
>
> The culprit is this inline function:
>
> static inline struct video_device *soc_camera_i2c_to_vdev(const struct
> i2c_client *client)
> {
> struct v4l2_subdev *sd = i2c_get_clientdata(client);
> struct soc_camera_device *icd = (struct soc_camera_device
> *)sd->grp_id;
> return icd ? icd->vdev : NULL;
> }
>
> sd->grp_id is a u32, so obviously this will fail on a 64-bit arch.
>
> Since ARM is moving to 64-bits as well we should fix this.
>
> Instead of abusing grp_id it is better to use the relatively new v4l2_subdev
> 'host_priv' field. This is a proper void pointer, and can be used by the host
> driver as it pleases.
I don't think this would work though. .grp_id is not only used to pass a
value between drivers, but also to filter, which subdevices will execute
this operation, as in v4l2_device_call_all(). I'll have to find time to
think of a solution.
> Can you make a patch for this? It would be nice to get rid of these warnings.
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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