linux-kernel - Re: [PATCH] rtc: asm9260: remove incorrect __init/_

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Date:	Wed, 16 Mar 2016 10:30:08 +0100
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Alessandro Zummo <a.zummo@...ertech.it>,
	Oleksij Rempel <linux@...pel-privat.de>,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rtc: asm9260: remove incorrect __init/__exit annotations

Hi,

On 15/03/2016 at 22:44:31 +0100, Arnd Bergmann wrote :
> The probe and remove callbacks of the platform driver are marked __init
> and __exit, respectively. However, this is not a correct way to annotate
> them, as it will result in those sections to be discarded at link time
> or after boot, while we can actually call them again based on manual
> unbinding, or deferred probing.
> 
> Kbuild warns about the problem:
> 
> WARNING: drivers/rtc/rtc-asm9260.o(.data+0x0): Section mismatch in reference from the variable asm9260_rtc_driver to the function .init.text:asm9260_rtc_probe()
> 

I'm not sure why this was not caught before. I'm not building all the
platform but that one should have been easy to find...

> This removes the annotations, so we no longer branch into missing
> code and avoid the warning.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: 125e550fd257 ("rtc: add Alphascale asm9260 driver")
> ---
>  drivers/rtc/rtc-asm9260.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-asm9260.c b/drivers/rtc/rtc-asm9260.c
> index 14e08c4c1a01..355fdb97a006 100644
> --- a/drivers/rtc/rtc-asm9260.c
> +++ b/drivers/rtc/rtc-asm9260.c
> @@ -255,7 +255,7 @@ static const struct rtc_class_ops asm9260_rtc_ops = {
>  	.alarm_irq_enable	= asm9260_alarm_irq_enable,
>  };
>  
> -static int __init asm9260_rtc_probe(struct platform_device *pdev)
> +static int asm9260_rtc_probe(struct platform_device *pdev)
>  {
>  	struct asm9260_rtc_priv *priv;
>  	struct device *dev = &pdev->dev;
> @@ -323,7 +323,7 @@ err_return:
>  	return ret;
>  }
>  
> -static int __exit asm9260_rtc_remove(struct platform_device *pdev)
> +static int asm9260_rtc_remove(struct platform_device *pdev)
>  {
>  	struct asm9260_rtc_priv *priv = platform_get_drvdata(pdev);
>  
> -- 
> 2.7.0
> 

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com