linux-kernel - Re: [PATCH v2] ACPI: use sysfs_emit() to instead of scnprintf()

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Date:   Fri, 2 Dec 2022 20:26:06 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     ye.xingchen@....com.cn
Cc:     rafael@...nel.org, lenb@...nel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ACPI: use sysfs_emit() to instead of scnprintf()

On Wed, Nov 30, 2022 at 9:16 AM <ye.xingchen@....com.cn> wrote:
>
> From: ye xingchen <ye.xingchen@....com.cn>
>
> Replace the open-code with sysfs_emit() to simplify the code.
>
> Signed-off-by: ye xingchen <ye.xingchen@....com.cn>
> ---
> v1 -> v2
> combine patchs in drivers/acpi/.
>  drivers/acpi/acpi_pad.c  | 4 ++--
>  drivers/acpi/cppc_acpi.c | 4 ++--
>  2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
> index edbb28faee2a..02f1a1b1143c 100644
> --- a/drivers/acpi/acpi_pad.c
> +++ b/drivers/acpi/acpi_pad.c
> @@ -287,7 +287,7 @@ static ssize_t rrtime_store(struct device *dev,
>  static ssize_t rrtime_show(struct device *dev,
>         struct device_attribute *attr, char *buf)
>  {
> -       return scnprintf(buf, PAGE_SIZE, "%d\n", round_robin_time);
> +       return sysfs_emit(buf, "%d\n", round_robin_time);
>  }
>  static DEVICE_ATTR_RW(rrtime);
>
> @@ -309,7 +309,7 @@ static ssize_t idlepct_store(struct device *dev,
>  static ssize_t idlepct_show(struct device *dev,
>         struct device_attribute *attr, char *buf)
>  {
> -       return scnprintf(buf, PAGE_SIZE, "%d\n", idle_pct);
> +       return sysfs_emit(buf, "%d\n", idle_pct);
>  }
>  static DEVICE_ATTR_RW(idlepct);
>
> diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
> index 093675b1a1ff..0f17b1c32718 100644
> --- a/drivers/acpi/cppc_acpi.c
> +++ b/drivers/acpi/cppc_acpi.c
> @@ -148,7 +148,7 @@ __ATTR(_name, 0444, show_##_name, NULL)
>                 if (ret)                                                \
>                         return ret;                                     \
>                                                                         \
> -               return scnprintf(buf, PAGE_SIZE, "%llu\n",              \
> +               return sysfs_emit(buf, "%llu\n",                \
>                                 (u64)st_name.member_name);              \
>         }                                                               \
>         define_one_cppc_ro(member_name)
> @@ -174,7 +174,7 @@ static ssize_t show_feedback_ctrs(struct kobject *kobj,
>         if (ret)
>                 return ret;
>
> -       return scnprintf(buf, PAGE_SIZE, "ref:%llu del:%llu\n",
> +       return sysfs_emit(buf, "ref:%llu del:%llu\n",
>                         fb_ctrs.reference, fb_ctrs.delivered);
>  }
>  define_one_cppc_ro(feedback_ctrs);
> --

Applied as 6.2 material, thanks!