linux-kernel - Re: [for-next PATCH] PM / devfreq: Add sysfs node to expose available frequencies

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Message-ID: <1775844.L5g0QF5oVv@vostro.rjw.lan>
Date:	Fri, 26 Oct 2012 02:22:51 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Nishanth Menon <nm@...com>
Cc:	linux-pm <linux-pm@...r.kernel.org>,
	Rajagopal Venkat <rajagopal.venkat@...aro.org>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Kevin Hilman <khilman@...com>, linux-kernel@...r.kernel.org
Subject: Re: [for-next PATCH] PM / devfreq: Add sysfs node to expose available frequencies

On Thursday, October 25, 2012 07:03:21 PM Nishanth Menon wrote:
> On 01:56-20121026, Rafael J. Wysocki wrote:
> > On Thursday, October 25, 2012 06:32:43 PM Nishanth Menon wrote:
> [..]
> > > +static ssize_t show_available_freqs(struct device *d,
> > > +				    struct device_attribute *attr,
> > > +				    char *buf)
> > > +{
> > > +	struct devfreq *df = to_devfreq(d);
> > > +	struct device *dev = df->dev.parent;
> > > +	struct opp *opp;
> > > +	ssize_t count = 0;
> > > +	unsigned long freq = 0;
> > > +
> > > +	rcu_read_lock();
> > > +	do {
> > > +		opp = opp_find_freq_ceil(dev, &freq);
> > > +		if (IS_ERR(opp))
> > > +			break;
> > > +
> > > +		count += sprintf(&buf[count], "%lu ", freq);
> > > +		freq++;
> > > +	} while (1);
> > > +	rcu_read_unlock();
> > > +	count += sprintf(&buf[count], "\n");
> > 
> > Care to avoid printing the tailing space?
> count -= count ? 1 : 0;

What about

if (count)
  count--;

instead?

> count += sprintf(&buf[count], "\n");
> should take care of empty list and the trailing space. Sounds reasonable?

Thanks,
Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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