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

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Message-ID: <7958aa50-8808-e909-753c-e232b3d1f84e@packi.ch>
Date:   Sat, 10 Nov 2018 09:35:15 +0100
From:   Patrick Staehlin <me@...ki.ch>
To:     David Abdurachmanov <david.abdurachmanov@...il.com>,
        palmer@...ive.com, aou@...s.berkeley.edu,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] riscv: add S and U modes to ISA string

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

Patrick