Re: [RFC PATCH v2 00/13] nommu UML

[Lorenzo Stoakes <lorenzo.stoakes@oracle.com>]

On Fri, Nov 22, 2024 at 12:49:45PM +0000, Damien Le Moal wrote:
> On 11/22/24 21:38, Christoph Hellwig wrote:
> > On Fri, Nov 22, 2024 at 12:25:19PM +0000, Lorenzo Stoakes wrote:
> >> It's an ongoing maintenance burden, discussions about seeing whether it's
> >> feasible to remove it have been had in multiple places.
> >>
> >> I have personally run into issues having to accommodate it on numerous
> >> occasions, as have many others.
> >>
> >> I'd be interested to know which products specifically ship this and also
> >> require tip kernel, perhaps this is just a case of my not being aware of
> >> certain architectures?
> >
> > I can't tell you the products I know on commercial basis.  Most of them
> > are arm based, but I also know about at least one RISC-V one.    They
> > all used the latest long term stable at the time of release and tend
> > to stay on that.  And the involved vendors keep spinning out new versions
> > of these every few years.
>
> To add to this, we had a discussion at the RISC-V MC at plumbers last year (I
> think it was) about removing the K210 RISC-V SoC and associated RISC-V NOMMU
> support. But several people complained about that because several FPGAs
> implementing RISC-V cores are NOMMU (for obvious reasons for the FPGA case). So
> NOMMU is being used out there.

Thanks guys, appreciate the input, and this has made me aware of things I
simply was not before.

In that case, I am actually rather in favour of this series to make it
easier to test nommu things :)

>
> --
> Damien Le Moal
> Western Digital Research