Re: [PATCH] riscv: add S and U modes to ISA string

[Palmer Dabbelt]

On Sat, 10 Nov 2018 00:35:15 PST (-0800), me@xxxxxxxx wrote:
> On 10.11.18 07:45, David Abdurachmanov wrote:
> > The patch adds the missing S and U modes.
>
> This is the same patch I submitted earlier (see v2 here [1], based on
> Palmer's feedback). Palmer stated that the "S" extension should not be
> exposed to usermode.
>
> Since two people arrived at the same solution, I wonder if the
> supervisor mode should really be hidden from userspace, as it's about
> the CPU information, not about the environment the calling code is
> running as.
>
> [1] https://lkml.org/lkml/2018/11/10/96

I still think S should be hidden from applications.  This patch was fairly 
mechanical, so it probably just wasn't though about twice -- that's the problem 
with user ABI stuff, lots of times the obvious answer isn't the correct one :).

I'll take your second patch, I just haven't gotten around to actually fully 
reviewing patches yet as I'm still in my email triage phase.

Thanks!