linux-kernel - Re: [PATCH] misc: atmel-ssc: Fix section annotation on atmel_ssc_get_driver

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Message-ID: <20181017181625.GW17341@piout.net>
Date:   Wed, 17 Oct 2018 20:16:25 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] misc: atmel-ssc: Fix section annotation on
 atmel_ssc_get_driver_data

On 17/10/2018 10:09:02-0700, Nathan Chancellor wrote:
> After building the kernel with Clang, the following section mismatch
> warning appears:
> 
> WARNING: vmlinux.o(.text+0x3bf19a6): Section mismatch in reference from
> the function ssc_probe() to the function
> .init.text:atmel_ssc_get_driver_data()
> The function ssc_probe() references
> the function __init atmel_ssc_get_driver_data().
> This is often because ssc_probe lacks a __init
> annotation or the annotation of atmel_ssc_get_driver_data is wrong.
> 
> Remove __init from atmel_ssc_get_driver_data to get rid of the mismatch.
> 

Reviewed-by: Alexandre Belloni <alexandre.belloni@...tlin.com>

I would add:

Fixes: 5c86ac695c7e ("ASoC: atmel-ssc: use module_platform_driver macro")

> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
> 
> Alternatively, ssc_probe could be marked as __init, I don't think there
> is any way for the probe to defer. I decided to go with the more
> conservative option first but I'm happy to respin if necessary.
> 

A probe function should never be marked __init, unless you ensure there
is no way to bind/unbind the driver at runtime.

> Thanks!
> 
>  drivers/misc/atmel-ssc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/atmel-ssc.c b/drivers/misc/atmel-ssc.c
> index b2a0340f277e..d8e3cc2dc747 100644
> --- a/drivers/misc/atmel-ssc.c
> +++ b/drivers/misc/atmel-ssc.c
> @@ -132,7 +132,7 @@ static const struct of_device_id atmel_ssc_dt_ids[] = {
>  MODULE_DEVICE_TABLE(of, atmel_ssc_dt_ids);
>  #endif
>  
> -static inline const struct atmel_ssc_platform_data * __init
> +static inline const struct atmel_ssc_platform_data *
>  	atmel_ssc_get_driver_data(struct platform_device *pdev)
>  {
>  	if (pdev->dev.of_node) {
> -- 
> 2.19.1
> 

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com