linux-kernel - Re: [PATCH] arm64: cpufeatures: Clean up temporary variable to simplify code

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Date: Thu, 29 Feb 2024 11:10:37 +0000
From: Mark Rutland <mark.rutland@....com>
To: Liao Chang <liaochang1@...wei.com>
Cc: catalin.marinas@....com, will@...nel.org, broonie@...nel.org,
	maz@...nel.org, joey.gouly@....com, kristina.martsenko@....com,
	ryan.roberts@....com, jeremy.linton@....com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: cpufeatures: Clean up temporary variable to
 simplify code

On Thu, Feb 29, 2024 at 10:52:08AM +0000, Liao Chang wrote:
> Clean up one temporary variable to simplifiy code in capability
> detection.
> 
> Signed-off-by: Liao Chang <liaochang1@...wei.com>

This looks line a nice cleanup, so:

Acked-by: Mark Rutland <mark.rutland@....com>

For context, we removed the last other user of 'num' in commit:

  21fb26bfb01ffe0d ("arm64: alternatives: add alternative_has_feature_*()")

Mark.

> ---
>  arch/arm64/kernel/cpufeature.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
> index 8d1a634a403e..0e900b23f7ab 100644
> --- a/arch/arm64/kernel/cpufeature.c
> +++ b/arch/arm64/kernel/cpufeature.c
> @@ -3052,13 +3052,9 @@ static void __init enable_cpu_capabilities(u16 scope_mask)
>  	boot_scope = !!(scope_mask & SCOPE_BOOT_CPU);
>  
>  	for (i = 0; i < ARM64_NCAPS; i++) {
> -		unsigned int num;
> -
>  		caps = cpucap_ptrs[i];
> -		if (!caps || !(caps->type & scope_mask))
> -			continue;
> -		num = caps->capability;
> -		if (!cpus_have_cap(num))
> +		if (!caps || !(caps->type & scope_mask) ||
> +		    !cpus_have_cap(caps->capability))
>  			continue;
>  
>  		if (boot_scope && caps->cpu_enable)
> -- 
> 2.34.1
>