linux-kernel - [PATCH 1/4] ASoC: max98388: fix unused function warnings

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Message-Id: <20230616090156.2347850-1-arnd@kernel.org>
Date:   Fri, 16 Jun 2023 11:00:37 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, Ryan Lee <ryans.lee@...log.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] ASoC: max98388: fix unused function warnings

From: Arnd Bergmann <arnd@...db.de>

The PM functions are never referenced when CONFIG_PM_SLEEP is
disabled:

sound/soc/codecs/max98388.c:854:12: error: unused function 'max98388_suspend' [-Werror,-Wunused-function]
static int max98388_suspend(struct device *dev)
           ^
sound/soc/codecs/max98388.c:864:12: error: unused function 'max98388_resume' [-Werror,-Wunused-function]
static int max98388_resume(struct device *dev)

Fix this by using the modern SYSTEM_SLEEP_PM_OPS() macro in place of
the deprecated SET_SYSTEM_SLEEP_PM_OPS() version, and use pm_sleep_ptr()
to hide the entire structure as well.

On a related note, the of_match_ptr() and ACPI_PTR() macros have the same
problem and would cause the device id table to be unused when the driver
is built-in and the respective subsystems are disabled. This does not
cause warnings unless -Wunused-const-variable is passed to the compiler,
but it's better to just not use the macros at all here.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 sound/soc/codecs/max98388.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/sound/soc/codecs/max98388.c b/sound/soc/codecs/max98388.c
index 8062a71150074..3d03c4bac6c55 100644
--- a/sound/soc/codecs/max98388.c
+++ b/sound/soc/codecs/max98388.c
@@ -873,7 +873,7 @@ static int max98388_resume(struct device *dev)
 }
 
 static const struct dev_pm_ops max98388_pm = {
-	SET_SYSTEM_SLEEP_PM_OPS(max98388_suspend, max98388_resume)
+	SYSTEM_SLEEP_PM_OPS(max98388_suspend, max98388_resume)
 };
 
 static const struct regmap_config max98388_regmap = {
@@ -998,9 +998,9 @@ MODULE_DEVICE_TABLE(acpi, max98388_acpi_match);
 static struct i2c_driver max98388_i2c_driver = {
 	.driver = {
 		.name = "max98388",
-		.of_match_table = of_match_ptr(max98388_of_match),
-		.acpi_match_table = ACPI_PTR(max98388_acpi_match),
-		.pm = &max98388_pm,
+		.of_match_table = max98388_of_match,
+		.acpi_match_table = max98388_acpi_match,
+		.pm = pm_sleep_ptr(&max98388_pm),
 	},
 	.probe = max98388_i2c_probe,
 	.id_table = max98388_i2c_id,
-- 
2.39.2