linux-kernel - [PATCH RESEND] HID: google: fix unused variable warning under !CONFIG

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Message-ID: <20250217165013.3127063-1-eleanor15x@gmail.com>
Date: Tue, 18 Feb 2025 00:50:13 +0800
From: Yu-Chun Lin <eleanor15x@...il.com>
To: jikos@...nel.org,
	bentiss@...nel.org
Cc: linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	visitorckw@...il.com,
	jserv@...s.ncku.edu.tw,
	Yu-Chun Lin <eleanor15x@...il.com>,
	kernel test robot <lkp@...el.com>
Subject: [PATCH RESEND] HID: google: fix unused variable warning under !CONFIG_ACPI

As reported by the kernel test robot, the following warning occurs:

>> drivers/hid/hid-google-hammer.c:261:36: warning: 'cbas_ec_acpi_ids' defined but not used [-Wunused-const-variable=]
     261 | static const struct acpi_device_id cbas_ec_acpi_ids[] = {
         |                                    ^~~~~~~~~~~~~~~~

The 'cbas_ec_acpi_ids' array is only used when CONFIG_ACPI is enabled.
Wrapping its definition and 'MODULE_DEVICE_TABLE' in '#ifdef CONFIG_ACPI'
prevents a compiler warning when ACPI is disabled.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202501201141.jctFH5eB-lkp@intel.com/
Signed-off-by: Yu-Chun Lin <eleanor15x@...il.com>
---
 drivers/hid/hid-google-hammer.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hid/hid-google-hammer.c b/drivers/hid/hid-google-hammer.c
index 0f292b5d3e26..eb6fd2dc75d0 100644
--- a/drivers/hid/hid-google-hammer.c
+++ b/drivers/hid/hid-google-hammer.c
@@ -268,11 +268,13 @@ static void cbas_ec_remove(struct platform_device *pdev)
 	mutex_unlock(&cbas_ec_reglock);
 }
 
+#ifdef CONFIG_ACPI
 static const struct acpi_device_id cbas_ec_acpi_ids[] = {
 	{ "GOOG000B", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(acpi, cbas_ec_acpi_ids);
+#endif
 
 #ifdef CONFIG_OF
 static const struct of_device_id cbas_ec_of_match[] = {
-- 
2.43.0