ACK/Cmnt: [SRU][X,B,D] backport DIMLIB (lib/dim/) to pre-5.2 kernels

[Andrea Righi]

On Fri, Nov 15, 2019 at 08:55:31AM -0800, Kamal Mostafa wrote:
> BugLink: https://bugs.launchpad.net/bugs/1852637
> 
> The mellanox and broadcom drivers contained a "dynamic interrupt
> moderation" feature (as early as v5.0) which was broken out into a
> common kernel library 'DIMLIB' in lib/dim/ circa mainline v5.2.
> 
> Backported drivers may now need DIMLIB to be available in pre-5.2
> kernels (specifically, the latest upstream version of
> net/ethernet/amazon/ena does).
> 
> Pull req's to follow ...
> 
> For Disco:
>     Apply all the mainline commits from v5.2 which extract DIMLIB from
>     mellanox/broadcom and wire those drivers to use DIMLIB (plus a few
>     later DIMLIB fixes). I.e. make Disco work the same as > 5.2 kernels;
>     no significant functional change to those drivers.
> 
> For Bionic and Xenial:
>     Import the lib/dim/ directory from mainline (plus a couple porting
>     prerequisites), but do *not* make mellanox/broadcom use it. I.e. no
>     functional change at all.
> 
>  -Kamal

Pretty big change, but it seems self-contained and regression potential
seems minimal, therefore:

Acked-by: Andrea Righi <andrea.righi at canonical.com>