linux-kernel - Re: [PATCH v2 23/26] selftests/resctrl: Add helper to convert L2/3 to integer

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Date:   Tue, 28 Nov 2023 14:22:11 -0800
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        <linux-kselftest@...r.kernel.org>, Shuah Khan <shuah@...nel.org>,
        "Shaopeng Tan" <tan.shaopeng@...fujitsu.com>,
        Maciej Wieczór-Retman 
        <maciej.wieczor-retman@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>
CC:     <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 23/26] selftests/resctrl: Add helper to convert L2/3 to
 integer

Hi Ilpo,

On 11/20/2023 3:13 AM, Ilpo Järvinen wrote:
> "L2"/"L3" conversion to integer is embedded into get_cache_size()
> which prevents reuse.
> 
> Create a helper for the cache string to integer conversion to make
> it reusable.
> 
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> ---
>  tools/testing/selftests/resctrl/resctrlfs.c | 28 +++++++++++++++------
>  1 file changed, 20 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
> index fda5ad812faa..38ca3ae562e9 100644
> --- a/tools/testing/selftests/resctrl/resctrlfs.c
> +++ b/tools/testing/selftests/resctrl/resctrlfs.c
> @@ -94,6 +94,23 @@ int umount_resctrlfs(void)
>  	return 0;
>  }
>  
> +/*
> + * get_cache_level - Convert cache level from string to integer
> + * @cache_type:		Cache level as string
> + *
> + * Return: cache level as integer or -1 if @cache_type is invalid.
> + */
> +static int get_cache_level(const char *cache_type)
> +{
> +	if (!strcmp(cache_type, "L3"))
> +		return 3;
> +	if (!strcmp(cache_type, "L2"))
> +		return 2;
> +
> +	perror("Invalid cache level");

I know that you are just copying code here but this usage of
perror() does not look right. strcmp() does not set errno, it
does not "fail".

Reinette