linux-kernel - Re: [PATCH] powerpc/via-pmu: Fix section mismatch warning

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Date:   Tue, 13 Feb 2018 19:54:02 +0100
From:   Laurent Vivier <lvivier@...hat.com>
To:     Mathieu Malaterre <malat@...ian.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/via-pmu: Fix section mismatch warning

On 07/02/2018 20:44, Mathieu Malaterre wrote:
> Remove the __init annotation from pmu_init() to avoid the
> following warning.
> 
> WARNING: vmlinux.o(.data+0x4739c): Section mismatch in reference from the variable via_pmu_driver to the function .init.text:pmu_init()
> The variable via_pmu_driver references
> the function __init pmu_init()
> If the reference is valid then annotate the
> variable with __init* or __refdata (see linux/init.h) or name the variable:
> *_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console
> 
> Signed-off-by: Mathieu Malaterre <malat@...ian.org>
> ---
>  drivers/macintosh/via-pmu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/macintosh/via-pmu.c b/drivers/macintosh/via-pmu.c
> index 08849e33c567..5f378272d5b2 100644
> --- a/drivers/macintosh/via-pmu.c
> +++ b/drivers/macintosh/via-pmu.c
> @@ -378,7 +378,7 @@ static int pmu_probe(void)
>  	return vias == NULL? -ENODEV: 0;
>  }
>  
> -static int __init pmu_init(void)
> +static int pmu_init(void)
>  {
>  	if (vias == NULL)
>  		return -ENODEV;
> 

pmu_init() is really an init function only called by another init
function (adb_init()).

So I think it could be good to let the __init marker.

Did you try:

--- a/drivers/macintosh/via-pmu.c
+++ b/drivers/macintosh/via-pmu.c
@@ -198,7 +198,7 @@ static const struct file_operations
pmu_battery_proc_fops;
 static const struct file_operations pmu_options_proc_fops;

 #ifdef CONFIG_ADB
-struct adb_driver via_pmu_driver = {
+const struct adb_driver via_pmu_driver = {
        "PMU",
        pmu_probe,
        pmu_init,


Thanks,
Laurent