linux-kernel - Re: [PATCH v4 05/16] riscv: Extend cpufeature.c to detect vendor extensions

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Message-ID: <ZjKCtJWqoiLM3xZv@ghost>
Date: Wed, 1 May 2024 10:58:12 -0700
From: Charlie Jenkins <charlie@...osinc.com>
To: Conor Dooley <conor@...nel.org>
Cc: Evan Green <evan@...osinc.com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Guo Ren <guoren@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Clément Léger <cleger@...osinc.com>,
	Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>,
	linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...osinc.com>,
	linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
	linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v4 05/16] riscv: Extend cpufeature.c to detect vendor
 extensions

On Wed, May 01, 2024 at 06:19:34PM +0100, Conor Dooley wrote:
> On Wed, May 01, 2024 at 09:44:15AM -0700, Evan Green wrote:
> > On Fri, Apr 26, 2024 at 2:29 PM Charlie Jenkins <charlie@...osinc.com> wrote:
> 
> > > +struct riscv_isa_vendor_ext_data_list {
> > > +       const struct riscv_isa_ext_data *ext_data;
> > > +       struct riscv_isainfo *per_hart_vendor_bitmap;
> > > +       unsigned long *vendor_bitmap;
> > 
> > It took a lot of digging for me to understand this was the set of
> > vendor extensions supported on all harts. Can we add that to the name,
> > maybe something like isa_bitmap_all_harts? (I wonder if we could drop
> > the vendor part of the name since we already know we're in a
> > vendor_ext_data_list structure).
> 
> Reading this made me wonder, why is the all-hart bitmap an unsigned long
> when the per hart one is a riscv_isainfo struct?

Hmm I don't think there is a good reason for that. I believe this can
become struct riscv_isainfo * with no issues.

- Charlie