linux-kernel - Re: [PATCH v3 3/5] RISC-V: Fix unsupported isa string info.

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Date:   Wed, 07 Aug 2019 08:37:48 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...ive.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>
CC:     Atish Patra <Atish.Patra@....com>, info@...ux.net,
        allison@...utok.net, aou@...s.berkeley.edu,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        tglx@...utronix.de, daniel.lezcano@...aro.org,
        Anup Patel <Anup.Patel@....com>, mark.rutland@....com,
        robh+dt@...nel.org, johan@...nel.org, tiny.windzz@...il.com,
        Greg KH <gregkh@...uxfoundation.org>, gary@...yguo.net,
        linux-riscv@...ts.infradead.org
Subject:     Re: [PATCH v3 3/5] RISC-V: Fix unsupported isa string info.

On Tue, 06 Aug 2019 18:26:08 PDT (-0700), Paul Walmsley wrote:
> On Wed, 7 Aug 2019, Atish Patra wrote:
>
>> On Tue, 2019-08-06 at 16:27 -0700, Paul Walmsley wrote:
>>
>> > Seems like the "su" should be dropped from mandatory_ext.  What do you
>> > think?
>> >
>>
>> Yup. As DT binding only mention imafdc, mandatory extensions should
>> contain only that and just consider "su" extensions are considered as
>> implicit as we are running Linux.
>
> Discussing this with Andrew and Palmer, it looks like "su" is currently
> non-compliant.  Section 22.6 of the user-level specification states that
> the "s" character indicates that a longer standard supervisor extension
> name will follow.  So far I don't think any of these have been defined.
>
>> Do you think QEMU DT should be updated to reflect that ?
>
> Yes.

https://lists.nongnu.org/archive/html/qemu-riscv/2019-08/msg00141.html

>
>> > There's no Kconfig option by this name, and we're requiring
>> > compressed
>>
>> Sorry. This was a typo. It should have been CONFIG_RISCV_ISA_C.
>>
>> > instruction support as part of the RISC-V Linux baseline.  Could you
>> > share the rationale behind this?
>>
>> I think I added this check at the config file. Looking at the Kconfig,
>> RISCV_ISA_C is always enabled. So we can drop this.
>
> OK great.  Do you want to resend an updated patch, or would you like me to
> fix it up here?
>
> I'll also send a patch to drop CONFIG_RISCV_ISA_C.
>
>
> - Paul