[PATCH] drm/drm_vblank.c: avoid unsigned int to signed int cast

[David Laight]

From: 15330273260 at 189.cn <15330273260 at 189.cn>
> Sent: 23 May 2023 05:27
> 
> On 2023/5/22 19:29, Jani Nikula wrote:
> > In general, do not use unsigned types in arithmethic to avoid negative
> > values, because most people will be tripped over by integer promotion
> > rules, and you'll get negative values anyway.
> 
> 
> Here I'm sure about this,
> 
> but there are plenty unsigned types arithmetic in the kernel.

The real problem is (attempted) arithmetic on types smaller than int.
Regardless of whether they are signed or unsigned.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)