HID: google: fix unused variable warning under !CONFIG_ACPI

[ Upstream commit 4bd0725c09f377ffaf22b834241f6c050742e4fc ]

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.

Fixes: eb1aac4c8744f75 ("HID: google: add support tablet mode switch for Whiskers")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202501201141.jctFH5eB-lkp@intel.com/
Signed-off-by: Yu-Chun Lin <eleanor15x@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/hid/hid-google-hammer.c b/drivers/hid/hid-google-hammer.c
index 2f4c5b45d4096ac8fcdb135bd204ea84a7c43899..b0df025c6abafc3bee5f52962758132b5bf42d69 100644 (file)
--- a/drivers/hid/hid-google-hammer.c
+++ b/drivers/hid/hid-google-hammer.c
@@ -266,11 +266,13 @@ static int cbas_ec_remove(struct platform_device *pdev)
        return 0;
 }
 
+#ifdef CONFIG_ACPI
 static const struct acpi_device_id cbas_ec_acpi_ids[] = {
        { "GOOG000B", 0 },
        { }
 };
 MODULE_DEVICE_TABLE(acpi, cbas_ec_acpi_ids);
+#endif
 
 static struct platform_driver cbas_ec_driver = {
        .probe = cbas_ec_probe,