linux-kernel - Re: [PATCH] leds: Replace {devm_}led_classdev

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Date:   Tue, 27 Aug 2019 13:31:12 +0200
From:   Pavel Machek <pavel@....cz>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc:     linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dan Murphy <dmurphy@...com>
Subject: Re: [PATCH] leds: Replace {devm_}led_classdev_register() macros with
 inlines

On Mon 2019-08-26 23:02:19, Jacek Anaszewski wrote:
> Replace preprocessor macro aliases for legacy LED registration helpers
> with inline functions. It will allow to avoid misleading compiler error
> messages about missing symbol that actually wasn't explicitly used
> in the code. It used to occur when CONFIG_LEDS_CLASS was undefined
> and legacy (non-ext) function had been used in the code.
> 
> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@...il.com>

Acked-by: Pavel Machek <pavel@....cz>

> Cc: Dan Murphy <dmurphy@...com>
> ---
>  include/linux/leds.h | 29 +++++++++++++++++++++++++----
>  1 file changed, 25 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/leds.h b/include/linux/leds.h
> index d101fd13e18e..b8df71193329 100644
> --- a/include/linux/leds.h
> +++ b/include/linux/leds.h
> @@ -157,18 +157,39 @@ struct led_classdev {
>   * @led_cdev: the led_classdev structure for this device
>   * @init_data: the LED class device initialization data
>   *
> + * Register a new object of LED class, with name derived from init_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)
> +
> +/**
> + * led_classdev_register - register a new object of LED class
> + * @parent: LED controller device this LED is driven by
> + * @led_cdev: the led_classdev structure for this device
> + *
> + * Register a new object of LED class, with name derived from the name property
> + * of passed led_cdev argument.
> + *
> + * Returns: 0 on success or negative error value on failure
> + */
> +static inline int led_classdev_register(struct device *parent,
> +					struct led_classdev *led_cdev)
> +{
> +	return 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 int devm_led_classdev_register(struct device *parent,
> +					     struct led_classdev *led_cdev)
> +{
> +	return devm_led_classdev_register_ext(parent, led_cdev, NULL);
> +}
>  extern void led_classdev_unregister(struct led_classdev *led_cdev);
>  extern void devm_led_classdev_unregister(struct device *parent,
>  					 struct led_classdev *led_cdev);

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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