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

[Conor Dooley]

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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