linux-kernel - Re: [PATCH v4 02/11] riscv: add ISA extensions validation

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Date: Tue, 30 Apr 2024 13:12:32 +0100
From: Conor Dooley <conor.dooley@...rochip.com>
To: Clément Léger <cleger@...osinc.com>
CC: Conor Dooley <conor@...nel.org>, Jonathan Corbet <corbet@....net>, Paul
 Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Rob Herring <robh@...nel.org>, Krzysztof
 Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Anup Patel
	<anup@...infault.org>, Shuah Khan <shuah@...nel.org>, Atish Patra
	<atishp@...shpatra.org>, <linux-doc@...r.kernel.org>,
	<linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <kvm@...r.kernel.org>,
	<kvm-riscv@...ts.infradead.org>, <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH v4 02/11] riscv: add ISA extensions validation

On Tue, Apr 30, 2024 at 01:58:11PM +0200, Clément Léger wrote:
> Yeah, see what you mean. I think we also need to define if we want to
> expose all the ISA extensions in /proc/cpuinfo (ie no matter the config
> of the kernel) or not. If so, additional validate() callback would make
> sense. If we want to keep the full ISA string in /proc/info, then we
> will need another way of doing so.

If extensions aren't usable, they shouldn't be in /proc/cpuinfo either
as there's programs that parse that to figure out what they can use,
possibly even only checking a single cpu and using that as gospel.
That's why there's that per-hart-isa thing that was added by one of your
colleagues last year.

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