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Date: Wed, 1 May 2024 10:58:12 -0700
From: Charlie Jenkins <charlie@rivosinc.com>
To: Conor Dooley <conor@kernel.org>
Cc: Evan Green <evan@rivosinc.com>, Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>, Guo Ren <guoren@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
	Jernej Skrabec <jernej.skrabec@gmail.com>,
	Samuel Holland <samuel@sholland.org>,
	Conor Dooley <conor.dooley@microchip.com>,
	=?iso-8859-1?Q?Cl=E9ment_L=E9ger?= <cleger@rivosinc.com>,
	Jonathan Corbet <corbet@lwn.net>, Shuah Khan <shuah@kernel.org>,
	linux-riscv@lists.infradead.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, Palmer Dabbelt <palmer@rivosinc.com>,
	linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev,
	linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v4 05/16] riscv: Extend cpufeature.c to detect vendor
 extensions
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References: <20240426-dev-charlie-support_thead_vector_6_9-v4-0-b692f3c516ec@rivosinc.com>
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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@rivosinc.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