linux-kernel - Re: [PATCH] kernel: Use scnprintf() in show_smt

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Message-ID: <20200910111547.wkayyfmcf3crvcmh@e107158-lin.cambridge.arm.com>
Date:   Thu, 10 Sep 2020 12:15:49 +0100
From:   Qais Yousef <qais.yousef@....com>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     tglx@...utronix.de, peterz@...radead.org, cai@....pw,
        mingo@...nel.org, ethp@...com, tyhicks@...onical.com,
        arnd@...db.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kernel: Use scnprintf() in show_smt_*() instead of
 snprintf()

On 09/01/20 17:49, Shuah Khan wrote:
> Since snprintf() returns would-be-output size instead of the actual
> output size, replace it with scnprintf(), so the show_smt_control(),
> and show_smt_active() routines return the actual size.
> 
> Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>

Looks good to me.

Cheers

--
Qais Yousef

> ---
>  kernel/cpu.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/cpu.c b/kernel/cpu.c
> index 6ff2578ecf17..29a5ceb93cda 100644
> --- a/kernel/cpu.c
> +++ b/kernel/cpu.c
> @@ -2334,7 +2334,7 @@ show_smt_control(struct device *dev, struct device_attribute *attr, char *buf)
>  {
>  	const char *state = smt_states[cpu_smt_control];
>  
> -	return snprintf(buf, PAGE_SIZE - 2, "%s\n", state);
> +	return scnprintf(buf, PAGE_SIZE - 2, "%s\n", state);
>  }
>  
>  static ssize_t
> @@ -2348,7 +2348,7 @@ static DEVICE_ATTR(control, 0644, show_smt_control, store_smt_control);
>  static ssize_t
>  show_smt_active(struct device *dev, struct device_attribute *attr, char *buf)
>  {
> -	return snprintf(buf, PAGE_SIZE - 2, "%d\n", sched_smt_active());
> +	return scnprintf(buf, PAGE_SIZE - 2, "%d\n", sched_smt_active());
>  }
>  static DEVICE_ATTR(active, 0444, show_smt_active, NULL);
>  
> -- 
> 2.25.1
>