linux-kernel - Re: [PATCH] test_power: add missing newlines when printing parameters by sysfs

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Date:   Sat, 03 Oct 2020 14:43:09 -0700
From:   Joe Perches <joe@...ches.com>
To:     Sebastian Reichel <sre@...nel.org>,
        Xiongfeng Wang <wangxiongfeng2@...wei.com>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] test_power: add missing newlines when printing
 parameters by sysfs

On Sat, 2020-10-03 at 23:23 +0200, Sebastian Reichel wrote:
> Hi,
> 
> On Fri, Sep 04, 2020 at 02:09:58PM +0800, Xiongfeng Wang wrote:
> > When I cat some module parameters by sysfs, it displays as follows.
> > It's better to add a newline for easy reading.
[]
> > root@...kaller:~# cd /sys/module/test_power/parameters/
> > root@...kaller:/sys/module/test_power/parameters# cat ac_online
> > onroot@...kaller:/sys/module/test_power/parameters# cat battery_present
> > trueroot@...kaller:/sys/module/test_power/parameters# cat battery_health
> > goodroot@...kaller:/sys/module/test_power/parameters# cat battery_status
> > dischargingroot@...kaller:/sys/module/test_power/parameters# cat battery_technology
> > LIONroot@...kaller:/sys/module/test_power/parameters# cat usb_online
> > onroot@...kaller:/sys/module/test_power/parameters#
> > 
> > Signed-off-by: Xiongfeng Wang <wangxiongfeng2@...wei.com>
> > ---
> 
> Thanks, queued.
[]
> > diff --git a/drivers/power/supply/test_power.c b/drivers/power/supply/test_power.c
[]
> > @@ -353,6 +353,7 @@ static int param_set_ac_online(const char *key, const struct kernel_param *kp)
> >  static int param_get_ac_online(char *buffer, const struct kernel_param *kp)
> >  {
> >  	strcpy(buffer, map_get_key(map_ac_online, ac_online, "unknown"));
> > +	strcat(buffer, "\n");
> >  	return strlen(buffer);
> >  }

All of these would be better as sprintf(buffer, "%s\n", <whatever>)
so the output is scanned just once instead of scanned three times.