linux-kernel - Re: [rtc-linux] [PATCH 4/4] RTC: switch to using is

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Date:	Wed, 22 Jul 2015 14:44:46 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	rtc-linux@...glegroups.com,
	Alessandro Zummo <a.zummo@...ertech.it>,
	linux-kernel@...r.kernel.org
Subject: Re: [rtc-linux] [PATCH 4/4] RTC: switch to using is_visible() to
 control sysfs attributes

On Wed, Jul 22, 2015 at 10:57:35PM +0200, Alexandre Belloni wrote:
> (Krzysztof, be careful, Dmitry was not in copy of your maili, you should
> probably check your mailer config)
> 
> On 21/07/2015 at 10:21:11 +0900, Krzysztof Kozlowski wrote :
> > 2015-07-21 8:02 GMT+09:00 Dmitry Torokhov <dmitry.torokhov@...il.com>:
> > >  static ssize_t
> > > -rtc_sysfs_set_wakealarm(struct device *dev, struct device_attribute *attr,
> > > +wakealarm_store(struct device *dev, struct device_attribute *attr,
> > >                 const char *buf, size_t n)
> > >  {
> > >         ssize_t retval;
> > > @@ -221,45 +209,58 @@ rtc_sysfs_set_wakealarm(struct device *dev, struct device_attribute *attr,
> > >         retval = rtc_set_alarm(rtc, &alm);
> > >         return (retval < 0) ? retval : n;
> > >  }
> > > -static DEVICE_ATTR(wakealarm, S_IRUGO | S_IWUSR,
> > > -               rtc_sysfs_show_wakealarm, rtc_sysfs_set_wakealarm);
> > > +static DEVICE_ATTR_RW(wakealarm);
> > 
> > This and renaming of show/store functions look unrelated
> > 
> 
> I don't really mind that one but I would also prefer if it could be
> separated.

OK, I will.

> 
> > >
> > > +static struct attribute *rtc_attrs[] = {
> > > +       &dev_attr_name.attr,
> > > +       &dev_attr_date.attr,
> > > +       &dev_attr_time.attr,
> > > +       &dev_attr_since_epoch.attr,
> > > +       &dev_attr_max_user_freq.attr,
> > > +       &dev_attr_hctosys.attr,
> > > +       &dev_attr_wakealarm.attr,
> > > +       NULL,
> > > +};
> > >
> > > -/* The reason to trigger an alarm with no process watching it (via sysfs)
> > > +/*
> > > + * The reason to trigger an alarm with no process watching it (via sysfs)
> > >   * is its side effect:  waking from a system state like suspend-to-RAM or
> > >   * suspend-to-disk.  So: no attribute unless that side effect is possible.
> > >   * (Userspace may disable that mechanism later.)
> > >   */
> > > -static inline int rtc_does_wakealarm(struct rtc_device *rtc)
> > > +static bool rtc_does_wakealarm(struct rtc_device *rtc)
> > >  {
> > >         if (!device_can_wakeup(rtc->dev.parent))
> > > -               return 0;
> > > +               return false;
> > > +
> > >         return rtc->ops->set_alarm != NULL;
> > >  }
> > 
> > This looks unrelated too and confuses me. Could you split such cleanup
> > from main goal of the patch?
> > 
> 
> That one is bothering me too.

Will separate this too.

Thanks.

-- 
Dmitry
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