On Tue, May 08, 2018 at 10:18:24AM +0200, Hans Verkuil wrote: > Just call this v4l_stub_g_fbuf, conform the naming of the other functions. > > So just replace vidioc_ by v4l_stub_ in all these DEFINE_IOCTL_FNC macros. > > This way the function name in the big array matches the name in this macro, > and the 'stub' part indicates that it is just a stub function. vidioc_ is actually part of the function name in struct v4l2_ioctl_ops, which the stub needs to call. I can change the stub name to start with v4l_stub_, but if you prefer to drop vidioc_ entirely from the name, the macro still wouldn't end up matching the array. It would have to be something like this: #define DEFINE_IOCTL_FNC(_vidioc) \ static int v4l_stub_ ## _vidioc( \ ... return ops->vidioc_ ## _vidioc(file, fh, p); \ ... DEFINE_IOCTL_FNC(g_fbuf) ... static struct v4l2_ioctl_info v4l2_ioctls[] = { ... IOCTL_INFO(VIDIOC_G_FBUF, v4l_stub_g_fbuf, ...), Any thoughts? Sami