Beginning with the commit in the subject, I get the following build error:

   CC [M]  drivers/media/v4l2-core/videobuf2-core.o
drivers/media/v4l2-core/videobuf2-core.c: In function ‘vb2_warn_zero_bytesused’:
drivers/media/v4l2-core/videobuf2-core.c:1253:2: error: implicit declaration of 
function ‘__WARN’ [-Werror=implicit-function-declaration]
   __WARN();
   ^
cc1: some warnings being treated as errors

My .config is attached.

This problem has been bisected to the following commit:

commit 77a3c6fd90c94f635edb00d4a65f485687538791
Author: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Date:   Fri Jun 19 08:50:07 2015 -0300

     [media] vb2: Don't WARN when v4l2_buffer.bytesused is 0 for multiplanar buffers

     Commit f61bf13b6a07 ("[media] vb2: add allow_zero_bytesused flag to the
     vb2_queue struct") added a WARN_ONCE to catch usage of a deprecated API
     using a zero value for v4l2_buffer.bytesused.

     However, the condition is checked incorrectly, as the v4L2_buffer
     bytesused field is supposed to be ignored for multiplanar buffers. This
     results in spurious warnings when using the multiplanar API.

     Fix it by checking v4l2_buffer.bytesused for uniplanar buffers and
     v4l2_plane.bytesused for multiplanar buffers.

     Fixes: f61bf13b6a07 ("[media] vb2: add allow_zero_bytesused flag to the 
vb2_queue struct")

     Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
     Cc: stable@vger.kernel.org # for v4.0
     Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

Thanks,

Larry