linux-kernel - Re: [PATCH 06/20] include: input: elan-i2c-ids: Mark 'elan_acpi_id' as __maybe

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Message-ID: <20201104225054.GC1003057@dtor-ws>
Date:   Wed, 4 Nov 2020 14:50:54 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     linux-kernel@...r.kernel.org, dusonlin@....com.tw,
        KT Liao <kt.liao@....com.tw>, linux-input@...r.kernel.org
Subject: Re: [PATCH 06/20] include: input: elan-i2c-ids: Mark 'elan_acpi_id'
 as __maybe_unused

Hi Lee,

On Wed, Nov 04, 2020 at 04:24:13PM +0000, Lee Jones wrote:
> Some drivers which include 'elan-i2c-ids.h' make use of
> 'elan_acpi_id', but not all do.  Tell the compiler that this is
> expected behaviour.
> 
> Fixes the following W=1 kernel build warning(s):
> 
>  include/linux/input/elan-i2c-ids.h:26:36: warning: ‘elan_acpi_id’ defined but not used [-Wunused-const-variable=]
> 
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Cc: dusonlin@....com.tw
> Cc: KT Liao <kt.liao@....com.tw>
> Cc: linux-input@...r.kernel.org
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
>  include/linux/input/elan-i2c-ids.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/input/elan-i2c-ids.h b/include/linux/input/elan-i2c-ids.h
> index 520858d126808..b6976d99b6b75 100644
> --- a/include/linux/input/elan-i2c-ids.h
> +++ b/include/linux/input/elan-i2c-ids.h
> @@ -23,7 +23,7 @@
>  
>  #include <linux/mod_devicetable.h>
>  
> -static const struct acpi_device_id elan_acpi_id[] = {
> +static const struct acpi_device_id __maybe_unused elan_acpi_id[] = {
>  	{ "ELAN0000", 0 },
>  	{ "ELAN0100", 0 },
>  	{ "ELAN0600", 0 },

I think I'd prefer something like this instead:

diff --git a/drivers/input/mouse/elan_i2c_core.c
b/drivers/input/mouse/elan_i2c_core.c
index c599e21a8478..65d21a050cea 100644
--- a/drivers/input/mouse/elan_i2c_core.c
+++ b/drivers/input/mouse/elan_i2c_core.c
@@ -34,7 +34,6 @@
 #include <linux/completion.h>
 #include <linux/of.h>
 #include <linux/property.h>
-#include <linux/input/elan-i2c-ids.h>
 #include <linux/regulator/consumer.h>
 #include <asm/unaligned.h>

@@ -1413,6 +1412,7 @@ static const struct i2c_device_id elan_id[] = {
 MODULE_DEVICE_TABLE(i2c, elan_id);

 #ifdef CONFIG_ACPI
+#include <linux/input/elan-i2c-ids.h>
 MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
 #endif

Thanks.

-- 
Dmitry