linux-kernel - Re: [PATCH] clocksource: j-core: type fix init function return code

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Date:	Wed, 27 Jul 2016 01:25:33 -0400
From:	Rich Felker <dalias@...c.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clocksource: j-core: type fix init function return code

On Tue, Jul 26, 2016 at 02:31:29PM +0200, Arnd Bergmann wrote:
> The CLOCKSOURCE_OF_DECLARE now takes a function that returns an 'int', but a this
> new clocksource driver has just appeared in linux-next and causes a warning because
> it has the old 'void' return value:
> 
> In file included from ../include/linux/clocksource.h:18:0,
>                  from ../include/linux/clockchips.h:13,
>                  from ../drivers/clocksource/jcore-pit.c:14:
> include/linux/of.h:1006:20: error: comparison of distinct pointer types lacks a cast [-Werror]
>         .data = (fn == (fn_type)NULL) ? fn : fn  }
>                     ^
> 
> This adapts the jcore_pit_init() function to the correct return type.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: e0aa0655c60b ("clocksource: add J-Core timer/clocksource driver")
> ---
> The patch that introduces the warnign currently only exists in the linux-sh git
> tree and showed up in linux-next this week.

I've removed the commit from my for-next branch since it's not
appropriate to go upstream through my tree. Your patch should still be
applied in the proper subsystem tree, though, I think. Daniel?

Rich


> ---
>  drivers/clocksource/jcore-pit.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clocksource/jcore-pit.c b/drivers/clocksource/jcore-pit.c
> index 373b9f954a5c..4a2f7803624b 100644
> --- a/drivers/clocksource/jcore-pit.c
> +++ b/drivers/clocksource/jcore-pit.c
> @@ -154,7 +154,7 @@ static irqreturn_t jcore_timer_interrupt(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static void __init jcore_pit_init(struct device_node *node)
> +static int __init jcore_pit_init(struct device_node *node)
>  {
>  	int err;
>  	__iomem void *pit_base;
> @@ -169,12 +169,14 @@ static void __init jcore_pit_init(struct device_node *node)
>  	pit_base = of_iomap(node, 0);
>  	if (!pit_base) {
>  		pr_err("Error: Cannot map base address for J-Core PIT\n");
> +		err = -ENXIO;
>  		goto out;
>  	}
>  
>  	pit_irq = irq_of_parse_and_map(node, 0);
>  	if (!pit_irq) {
>  		pr_err("Error: J-Core PIT has no IRQ\n");
> +		err = -ENXIO;
>  		goto out;
>  	}
>  
> @@ -183,6 +185,7 @@ static void __init jcore_pit_init(struct device_node *node)
>  	cs = kzalloc(sizeof *cs, GFP_KERNEL);
>  	if (!cs) {
>  		pr_err("Failed to allocate memory for clocksource\n");
> +		err = ENOMEM;
>  		goto out;
>  	}
>  	jcore_cs = &cs->cs;
> @@ -207,12 +210,14 @@ static void __init jcore_pit_init(struct device_node *node)
>  	pit_percpu = alloc_percpu(struct jcore_pit);
>  	if (!pit_percpu) {
>  		pr_err("Failed to allocate memory for clock event device\n");
> +		err = ENOMEM;
>  		goto out;
>  	}
>  
>  	nb = kzalloc(sizeof *nb, GFP_KERNEL);
>  	if (!nb) {
>  		pr_err("Failed to allocate memory for J-Core PIT notifier\n");
> +		err = ENOMEM;
>  		goto out;
>  	}
>  
> @@ -268,10 +273,11 @@ static void __init jcore_pit_init(struct device_node *node)
>  
>  	jcore_pit_local_init(this_cpu_ptr(pit_percpu));
>  
> -	return;
> +	return 0;
>  
>  out:
>  	pr_err("Could not initialize J-Core PIT driver\n");
> +	return err;
>  }
>  
>  CLOCKSOURCE_OF_DECLARE(jcore_pit, "jcore,pit", jcore_pit_init);
> -- 
> 2.9.0