linux-kernel - Re: [PATCH v3 2/5] cpupower: Add is_valid

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Message-ID: <ZJGilObVcAMhPNF4@amd.com>
Date:   Tue, 20 Jun 2023 20:59:00 +0800
From:   Huang Rui <ray.huang@....com>
To:     "Karny, Wyes" <Wyes.Karny@....com>
Cc:     "trenn@...e.com" <trenn@...e.com>,
        "shuah@...nel.org" <shuah@...nel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "Shenoy, Gautham Ranjal" <gautham.shenoy@....com>,
        "Limonciello, Mario" <Mario.Limonciello@....com>,
        "Yuan, Perry" <Perry.Yuan@....com>
Subject: Re: [PATCH v3 2/5] cpupower: Add is_valid_path API

On Tue, Jun 20, 2023 at 03:05:00AM +0800, Karny, Wyes wrote:
> Add is_valid_path API to check whether the sysfs file is present or not.
> 
> Suggested-by: Gautham R. Shenoy <gautham.shenoy@....com>
> Reviewed-by: Mario Limonciello <mario.limonciello@....com>
> Signed-off-by: Wyes Karny <wyes.karny@....com>

Acked-by: Huang Rui <ray.huang@....com>

> ---
>  tools/power/cpupower/lib/cpupower.c        | 7 +++++++
>  tools/power/cpupower/lib/cpupower_intern.h | 1 +
>  2 files changed, 8 insertions(+)
> 
> diff --git a/tools/power/cpupower/lib/cpupower.c b/tools/power/cpupower/lib/cpupower.c
> index 3f7d0c0c5067..7a2ef691b20e 100644
> --- a/tools/power/cpupower/lib/cpupower.c
> +++ b/tools/power/cpupower/lib/cpupower.c
> @@ -14,6 +14,13 @@
>  #include "cpupower.h"
>  #include "cpupower_intern.h"
>  
> +int is_valid_path(const char *path)
> +{
> +	if (access(path, F_OK) == -1)
> +		return 0;
> +	return 1;
> +}
> +
>  unsigned int cpupower_read_sysfs(const char *path, char *buf, size_t buflen)
>  {
>  	ssize_t numread;
> diff --git a/tools/power/cpupower/lib/cpupower_intern.h b/tools/power/cpupower/lib/cpupower_intern.h
> index ac1112b956ec..5fdb8620d41b 100644
> --- a/tools/power/cpupower/lib/cpupower_intern.h
> +++ b/tools/power/cpupower/lib/cpupower_intern.h
> @@ -7,5 +7,6 @@
>  
>  #define SYSFS_PATH_MAX 255
>  
> +int is_valid_path(const char *path);
>  unsigned int cpupower_read_sysfs(const char *path, char *buf, size_t buflen);
>  unsigned int cpupower_write_sysfs(const char *path, char *buf, size_t buflen);
> -- 
> 2.34.1
>