[PATCH 9/9] kernel/x86: remove DRM support

[Thibaut]

> Le 27 avr. 2023 à 02:11, Elliott Mitchell <ehem+openwrt at m5p.com> a écrit :
> 
> On Thu, Apr 27, 2023 at 12:50:52AM +0200, Stefan Lippers-Hollmann wrote:
>> On 2023-04-19, Elliott Mitchell wrote:
>>> Direct Rendering Manager is mainly for running X (possibly Wayland
>>> too).  As OpenWRT is meant for networking devices, there is no need
>>> for the support to be present.
>> 
>> That is only partially true, the Linux kernel is making a strong push
>> away from deprecated (FB_*) graphics drivers to DRM based ones, with 
>> kernel based mode setting this is getting more (any) attention for 
>> console support as well. Even without getting anywhere near X/ Wayland,
>> there is more than just a 80x25 tty on real hardware (and even VMs).
> 
> Real x86 hardware often has the capability to use a serial port as
> console.  The conventional UEFI implementation fully supports this use
> case.  I can well believe a number of manufacturers disabling the
> functionality though.
> 
> VMs *can* have more than a 80x25 tty.  By the time you're getting to 4
> or more VMs you should be thinking about disabling the functionality due
> to the heavy overhead (unless the OS in the VM doesn't support serial
> consoles).

You seem to assume that x86 is only/mainly run on VMs.
That is not necessarily the case, and I see no reason to degrade device support that way.

Would you mind documenting the measurable gains from your changes, so we have some metric to assess their relevance?

Cheers,
T