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

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Message-ID: <a2795337bd86ff22ae9618d7ccae22e7482be332.camel@wdc.com>
Date:   Wed, 7 Aug 2019 17:31:51 +0000
From:   Atish Patra <Atish.Patra@....com>
To:     "paul.walmsley@...ive.com" <paul.walmsley@...ive.com>
CC:     "info@...ux.net" <info@...ux.net>,
        "allison@...utok.net" <allison@...utok.net>,
        "palmer@...ive.com" <palmer@...ive.com>,
        "aou@...s.berkeley.edu" <aou@...s.berkeley.edu>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
        Anup Patel <Anup.Patel@....com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "johan@...nel.org" <johan@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "tiny.windzz@...il.com" <tiny.windzz@...il.com>,
        "gary@...yguo.net" <gary@...yguo.net>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH v3 3/5] RISC-V: Fix unsupported isa string info.

On Tue, 2019-08-06 at 18:26 -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.
> 
> > > 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 am sending the patch right now. We can remove the 'S' mode check as
palmer have already sent the QEMU patch as well, .

Regards,
Atish
> I'll also send a patch to drop CONFIG_RISCV_ISA_C.
> 
> 
> - Paul