linux-kernel - Re: [PATCH v2 06/17] riscv: Extend cpufeature.c to detect vendor extensions

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Date: Wed, 17 Apr 2024 14:42:41 +0100
From: Conor Dooley <conor@...nel.org>
To: Charlie Jenkins <charlie@...osinc.com>
Cc: 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>,
	Evan Green <evan@...osinc.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 v2 06/17] riscv: Extend cpufeature.c to detect vendor
 extensions

On Mon, Apr 15, 2024 at 09:12:03PM -0700, Charlie Jenkins wrote:

> @@ -351,6 +343,14 @@ static void __init riscv_parse_isa_string(unsigned long *this_hwcap, struct risc
>  		bool ext_long = false, ext_err = false;
>  
>  		switch (*ext) {
> +		case 'x':
> +		case 'X':
> +			pr_warn("Vendor extensions are ignored in riscv,isa. Use riscv,isa-extensions instead.");

Was looking for something and noticed this - pr_warn_once() I think.

> +			/*
> +			 * In canonical order, the remaining extensions in the
> +			 * isa string will be vendor extensions so exit.
> +			 */
> +			break;
>  		case 's':
>  			/*
>  			 * Workaround for invalid single-letter 's' & 'u' (QEMU).

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