linux-kernel - Re: [PATCH -next v2 3/3] cacheinfo: Remove unused check in init_cache

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Date:   Tue, 24 Jan 2023 17:01:04 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Pierre Gondois <pierre.gondois@....com>
Cc:     linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Dan Carpenter <error27@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Akihiko Odaki <akihiko.odaki@...nix.com>,
        Palmer Dabbelt <palmer@...osinc.com>,
        Gavin Shan <gshan@...hat.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH -next v2 3/3] cacheinfo: Remove unused check in
 init_cache_level()

On Tue, Jan 24, 2023 at 04:40:48PM +0100, Pierre Gondois wrote:
> commit e75d18cecbb3 ("arm64: cacheinfo: Fix incorrect assignment
> of signed error value to unsigned fw_level")
> checks the fw_level value in init_cache_level() in case the value is
> negative.
> Remove this check as the error code is not returned through
> fw_level anymore, and reset fw_level if acpi_get_cache_info()
> failed. This allows to try fetching the cache information from
> clidr_el1.

I dunno anything about clidr_el1, but the mechanics of the change seem
fair. There is a non-acpi path too, which shouldn't return negative
numbers either so LGTM.

> Signed-off-by: Pierre Gondois <pierre.gondois@....com>
> ---
>  arch/arm64/kernel/cacheinfo.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/arch/arm64/kernel/cacheinfo.c b/arch/arm64/kernel/cacheinfo.c
> index bf348b8d321f..c307f69e9b55 100644
> --- a/arch/arm64/kernel/cacheinfo.c
> +++ b/arch/arm64/kernel/cacheinfo.c
> @@ -62,9 +62,6 @@ int init_cache_level(unsigned int cpu)
>  			fw_level = 0;
>  	}
>  
> -	if (fw_level < 0)
> -		return fw_level;
> -
>  	if (level < fw_level) {
>  		/*
>  		 * some external caches not specified in CLIDR_EL1
> -- 
> 2.25.1
> 

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