linux-kernel - Re: [PATCH 2/9] regulator: max20086: Mark OF related data as maybe unused

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Date:   Sun, 12 Mar 2023 11:42:16 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Tony Lindgren <tony@...mide.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 2/9] regulator: max20086: Mark OF related data as maybe
 unused

Hi Krzysztof,

Thank you for the patch.

On Fri, Mar 10, 2023 at 10:45:46PM +0100, Krzysztof Kozlowski wrote:
> The driver can be compile tested with !CONFIG_OF making certain data
> unused:
> 
>   drivers/regulator/max20086-regulator.c:289:34: error: ‘max20086_dt_ids’ defined but not used [-Werror=unused-const-variable=]
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
>  drivers/regulator/max20086-regulator.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/regulator/max20086-regulator.c b/drivers/regulator/max20086-regulator.c
> index b8bf76c170fe..c98a72f43935 100644
> --- a/drivers/regulator/max20086-regulator.c
> +++ b/drivers/regulator/max20086-regulator.c
> @@ -286,7 +286,7 @@ static const struct i2c_device_id max20086_i2c_id[] = {
>  
>  MODULE_DEVICE_TABLE(i2c, max20086_i2c_id);
>  
> -static const struct of_device_id max20086_dt_ids[] = {
> +static const struct of_device_id max20086_dt_ids[] __maybe_unused = {

The following change would also work, as the of_match_table field of
struct device_driver isn't conditioned by CONFIG_OF:

diff --git a/drivers/regulator/max20086-regulator.c b/drivers/regulator/max20086-regulator.c
index b8bf76c170fe..ad92f84b4abb 100644
--- a/drivers/regulator/max20086-regulator.c
+++ b/drivers/regulator/max20086-regulator.c
@@ -320,7 +320,7 @@ MODULE_DEVICE_TABLE(of, max20086_dt_ids);
 static struct i2c_driver max20086_regulator_driver = {
 	.driver = {
 		.name = "max20086",
-		.of_match_table = of_match_ptr(max20086_dt_ids),
+		.of_match_table = max20086_dt_ids,
 	},
 	.probe_new = max20086_i2c_probe,
 	.id_table = max20086_i2c_id,

Your patch should reduce the module size without any real drawback as
far as I can see, so that's probably best. I'm fine with either
approach, so

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

>  	{
>  		.compatible = "maxim,max20086",
>  		.data = &(const struct max20086_chip_info) {

-- 
Regards,

Laurent Pinchart