Re: [PATCH v4 1/9] riscv: vector: add a comment when calling riscv_setup_vsize()

[Conor Dooley]

On Fri, Apr 12, 2024 at 02:48:57PM +0800, Andy Chiu wrote:
> The function would fail when it detects the calling hart's vlen doesn't
> match the first one's. The boot hart is the first hart calling this
> function during riscv_fill_hwcap, so it is impossible to fail here. Add
> a comment about this behavior.
> 
> Signed-off-by: Andy Chiu <andy.chiu@xxxxxxxxxx>
> ---
> Changelog v2:
>  - update the comment (Conor)
> ---
>  arch/riscv/kernel/cpufeature.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> index 3ed2359eae35..d22b12072579 100644
> --- a/arch/riscv/kernel/cpufeature.c
> +++ b/arch/riscv/kernel/cpufeature.c
> @@ -683,6 +683,10 @@ void __init riscv_fill_hwcap(void)
>  	}
>  
>  	if (elf_hwcap & COMPAT_HWCAP_ISA_V) {
> +		/*
> +		 * This callsite can't fail here. It cannot fail when called on
> +		 * the boot hart.

I am loathe to comment on this again, so 
Reviewed-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
but you could just write this as "This cannot fail when called on the
boot hart."

Cheers,
Conor.

> +		 */
>  		riscv_v_setup_vsize();
>  		/*
>  		 * ISA string in device tree might have 'v' flag, but
> 
> -- 
> 2.44.0.rc2
>

Attachment: signature.asc
Description: PGP signature