ACPI: processor: idle: Fix function defined but not used warning

If CONFIG_ACPI_PROCESSOR_IDLE=n, acpi_processor_register_idle_driver()
and acpi_processor_unregister_idle_driver() are never used and the
empty stubs of them are not needed.  Moreover, they cause the compiler
to complain [1], so remove them.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202508300519.tZQHY6HA-lkp@intel.com/ [1]
Fixes: 7a8c994cbb2d ("ACPI: processor: idle: Optimize ACPI idle driver registration")
Signed-off-by: Huisong Li <lihuisong@huawei.com>
Link: https://patch.msgid.link/20250905081900.663869-2-lihuisong@huawei.com
[ rjw: Changelog rewrite ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 360b673f05e5759b4c611921b2ee98a56e90c5f1..ff864c1cee3a4c3edf4be3a4f428bec2a86833e8 100644 (file)
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -445,12 +445,6 @@ static inline int acpi_processor_hotplug(struct acpi_processor *pr)
 {
        return -ENODEV;
 }
-static inline void acpi_processor_register_idle_driver(void)
-{
-}
-static inline void acpi_processor_unregister_idle_driver(void)
-{
-}
 #endif /* CONFIG_ACPI_PROCESSOR_IDLE */
 
 /* in processor_thermal.c */