[PATCH 3/6] dma-buf: Add ioctls to allow userspace to flush

[Tiago Vignatti]

On 08/27/2015 09:06 AM, Hwang, Dongseong wrote:
> On Thu, Aug 27, 2015 at 2:29 AM, Tiago Vignatti
>> +#define DMA_BUF_BASE           'b'
>
> 'b' is occupied by vme and qat driver;
> https://github.com/torvalds/linux/blob/master/Documentation/ioctl/ioctl-number.txt#L201

I believe this is alright, as noted in that txt file: "Because of the 
large number of drivers, many drivers share a partial letter with other 
drivers".

> is it bad idea for drm.h to include these definition?
> http://lxr.free-electrons.com/source/include/uapi/drm/drm.h#L684

this is not a drm code and other type of device drivers might want to 
use it as well.

Tiago