linux-kernel - Re: [PATCH v2 1/3] drivers/clocksource/timer-of: Remove _

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Date:   Fri, 13 Aug 2021 15:33:58 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Chunyan Zhang <zhang.lyra@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Saravana Kannan <saravanak@...gle.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <chunyan.zhang@...soc.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] drivers/clocksource/timer-of: Remove __init
 markings

On 15/07/2021 08:54, Chunyan Zhang wrote:
> From: Saravana Kannan <saravanak@...gle.com>
> 
> This allows timer drivers to be compiled as modules.

Why ?

These changes will create a precedence with the timers being loaded as
modules. A longer description is important.

Also, loading the timers may be fine but unloading them is not supported
AFAICT from the time framework. That should be described also and the
code should make sure the unloading will be never supported in any
module conversion.

> Signed-off-by: Saravana Kannan <saravanak@...gle.com>
> Signed-off-by: Chunyan Zhang <chunyan.zhang@...soc.com>
> ---
>  drivers/clocksource/timer-of.c | 17 +++++++++--------
>  drivers/clocksource/timer-of.h |  4 ++--
>  2 files changed, 11 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/clocksource/timer-of.c b/drivers/clocksource/timer-of.c
> index 529cc6a51cdb..7f108978fd51 100644
> --- a/drivers/clocksource/timer-of.c
> +++ b/drivers/clocksource/timer-of.c
> @@ -19,7 +19,7 @@
>   *
>   * Free the irq resource
>   */
> -static __init void timer_of_irq_exit(struct of_timer_irq *of_irq)
> +static void timer_of_irq_exit(struct of_timer_irq *of_irq)
>  {
>  	struct timer_of *to = container_of(of_irq, struct timer_of, of_irq);
>  
> @@ -47,7 +47,7 @@ static __init void timer_of_irq_exit(struct of_timer_irq *of_irq)
>   *
>   * Returns 0 on success, < 0 otherwise
>   */
> -static __init int timer_of_irq_init(struct device_node *np,
> +static int timer_of_irq_init(struct device_node *np,
>  				    struct of_timer_irq *of_irq)
>  {
>  	int ret;
> @@ -91,7 +91,7 @@ static __init int timer_of_irq_init(struct device_node *np,
>   *
>   * Disables and releases the refcount on the clk
>   */
> -static __init void timer_of_clk_exit(struct of_timer_clk *of_clk)
> +static void timer_of_clk_exit(struct of_timer_clk *of_clk)
>  {
>  	of_clk->rate = 0;
>  	clk_disable_unprepare(of_clk->clk);
> @@ -107,7 +107,7 @@ static __init void timer_of_clk_exit(struct of_timer_clk *of_clk)
>   *
>   * Returns 0 on success, < 0 otherwise
>   */
> -static __init int timer_of_clk_init(struct device_node *np,
> +static int timer_of_clk_init(struct device_node *np,
>  				    struct of_timer_clk *of_clk)
>  {
>  	int ret;
> @@ -146,12 +146,12 @@ static __init int timer_of_clk_init(struct device_node *np,
>  	goto out;
>  }
>  
> -static __init void timer_of_base_exit(struct of_timer_base *of_base)
> +static void timer_of_base_exit(struct of_timer_base *of_base)
>  {
>  	iounmap(of_base->base);
>  }
>  
> -static __init int timer_of_base_init(struct device_node *np,
> +static int timer_of_base_init(struct device_node *np,
>  				     struct of_timer_base *of_base)
>  {
>  	of_base->base = of_base->name ?
> @@ -165,7 +165,7 @@ static __init int timer_of_base_init(struct device_node *np,
>  	return 0;
>  }
>  
> -int __init timer_of_init(struct device_node *np, struct timer_of *to)
> +int timer_of_init(struct device_node *np, struct timer_of *to)
>  {
>  	int ret = -EINVAL;
>  	int flags = 0;
> @@ -209,6 +209,7 @@ int __init timer_of_init(struct device_node *np, struct timer_of *to)
>  		timer_of_base_exit(&to->of_base);
>  	return ret;
>  }
> +EXPORT_SYMBOL_GPL(timer_of_init);
>  
>  /**
>   * timer_of_cleanup - release timer_of resources
> @@ -217,7 +218,7 @@ int __init timer_of_init(struct device_node *np, struct timer_of *to)
>   * Release the resources that has been used in timer_of_init().
>   * This function should be called in init error cases
>   */
> -void __init timer_of_cleanup(struct timer_of *to)
> +void timer_of_cleanup(struct timer_of *to)
>  {
>  	if (to->flags & TIMER_OF_IRQ)
>  		timer_of_irq_exit(&to->of_irq);
> diff --git a/drivers/clocksource/timer-of.h b/drivers/clocksource/timer-of.h
> index a5478f3e8589..1b8cfac5900a 100644
> --- a/drivers/clocksource/timer-of.h
> +++ b/drivers/clocksource/timer-of.h
> @@ -66,9 +66,9 @@ static inline unsigned long timer_of_period(struct timer_of *to)
>  	return to->of_clk.period;
>  }
>  
> -extern int __init timer_of_init(struct device_node *np,
> +extern int timer_of_init(struct device_node *np,
>  				struct timer_of *to);
>  
> -extern void __init timer_of_cleanup(struct timer_of *to);
> +extern void timer_of_cleanup(struct timer_of *to);
>  
>  #endif
> 


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