uml: drop target

[Paul Spooren]

On 10/8/21 5:54 AM, Sergey Ryazanov wrote:
> Hello Paul,
>
> thank you for posting this to ML.
>
> On Fri, Oct 8, 2021 at 12:05 PM Paul Spooren <mail at aparcar.org> wrote:
>> as previously posted on GitHub[1] I'd like to remove the UML target
>> since it seems broken, isn't offered by our buildbots and it's purpose
>> for testing can be replaced by using qemu.
>>
>> Is anyone here actively using UML and would like to keep it?
>>
>> [1]: https://github.com/openwrt/openwrt/pull/4643
> I personally do not use UML yet. I tested it a few months ago, It
> works smoothly and I find it a good lightweight solution for testing
> of massive installations like a routing protocol evaluation or a load
> testing, etc.
>
> What are the drawbacks of keeping UML?
>
I tried to compile it the other day and the Kernel wouldn't compile. 
Since we want Kernel 5.10 only for the next release UML needs a 
(working) bump to 5.10 or will be dropped.

Could you have a look at it?