linux-kernel - Re: [PATCH 2/2] riscv: cpufeature: Fix extension subset checking

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Date: Fri, 26 Apr 2024 11:04:25 +0200
From: Andrew Jones <ajones@...tanamicro.com>
To: Charlie Jenkins <charlie@...osinc.com>
Cc: 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@...nel.org>, Conor Dooley <conor.dooley@...rochip.com>, 
	Clément Léger <cleger@...osinc.com>, Evan Green <evan@...osinc.com>, 
	Palmer Dabbelt <palmer@...osinc.com>, linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	Alexandre Ghiti <alexghiti@...osinc.com>
Subject: Re: [PATCH 2/2] riscv: cpufeature: Fix extension subset checking

On Wed, Apr 24, 2024 at 09:19:55AM GMT, Charlie Jenkins wrote:
> This loop is supposed to check if ext->subset_ext_ids[j] is valid, rather
> than if ext->subset_ext_ids[i] is valid, before setting the extension
> id ext->subset_ext_ids[j] in isainfo->isa.
> 
> Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>
> Fixes: 0d8295ed975b ("riscv: add ISA extension parsing for scalar crypto")
> ---
>  arch/riscv/kernel/cpufeature.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> index c6e27b45e192..6dff7bb1db3f 100644
> --- a/arch/riscv/kernel/cpufeature.c
> +++ b/arch/riscv/kernel/cpufeature.c
> @@ -607,7 +607,7 @@ static int __init riscv_fill_hwcap_from_ext_list(unsigned long *isa2hwcap)
>  
>  			if (ext->subset_ext_size) {
>  				for (int j = 0; j < ext->subset_ext_size; j++) {
> -					if (riscv_isa_extension_check(ext->subset_ext_ids[i]))
> +					if (riscv_isa_extension_check(ext->subset_ext_ids[j]))
>  						set_bit(ext->subset_ext_ids[j], isainfo->isa);
>  				}
>  			}
> 
> -- 
> 2.44.0
>

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>