linux-kernel - Re: [PATCH v4 02/26] leds: class: Improve LED and LED flash class registration API

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Date:   Wed, 24 Apr 2019 20:25:22 +0200
From:   Pavel Machek <pavel@....cz>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc:     linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, robh@...nel.org, dtor@...gle.com,
        linux@...ck-us.net, Baolin Wang <baolin.wang@...aro.org>,
        Dan Murphy <dmurphy@...com>, Daniel Mack <daniel@...que.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Oleh Kravchenko <oleg@....org.ua>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Simon Shields <simon@...eageos.org>
Subject: Re: [PATCH v4 02/26] leds: class: Improve LED and LED flash class
 registration API

Hi!

> >>+/**
> >>+ * led_classdev_register_ext - register a new object of LED class with
> >>+ *			       init data
> >>+ * @parent: LED controller device this LED is driven by
> >>+ * @led_cdev: the led_classdev structure for this device
> >>+ * @init_data: the LED class device initialization data
> >>+ *
> >>+ * Returns: 0 on success or negative error value on failure
> >>+ */
> >>+extern int led_classdev_register_ext(struct device *parent,
> >>+				     struct led_classdev *led_cdev,
> >>+				     struct led_init_data *init_data);
> >>+#define led_classdev_register(parent, led_cdev)			\
> >>+	led_classdev_register_ext(parent, led_cdev, NULL)
> >>+extern int devm_led_classdev_register_ext(struct device *parent,
> >>+					  struct led_classdev *led_cdev,
> >>+					  struct led_init_data *init_data);
> >>+#define devm_led_classdev_register(parent, led_cdev)		\
> >>+	devm_led_classdev_register_ext(parent, led_cdev, NULL)
> >
> >Static inline (instead of macro) might be preffered. More type safety
> >and less confusing behaviour in case of errors...
> 
> This is kind of alias. You have type control in the function being
> mapped. With inline we'd have to nest the function calls, i.e.
> it will worsen performance by this one additional call level.

It is not a big issue; but no, performance will be exactly the
same. "static inline" says .. well, inline this into caller, so there
will be one function call, not two.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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