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

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Date:   Wed, 17 Oct 2018 20:31:14 +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 11:20:31-0700, Nathan Chancellor wrote:
> On Wed, Oct 17, 2018 at 08:16:25PM +0200, Alexandre Belloni wrote:
> > 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.
> > 
> 
> Thank you for the review and that clarification, wasn't able to find
> much regarding __init on probe functions in my research.
> 

You can look for suppress_bind_attrs for more info.


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