linux-kernel - [PATCH] ACPI: processor: Fix function defined but not used warning

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Message-ID: <20250904121131.2610989-1-lihuisong@huawei.com>
Date: Thu, 4 Sep 2025 20:11:31 +0800
From: Huisong Li <lihuisong@...wei.com>
To: <rafael@...nel.org>, <lenb@...nel.org>
CC: <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linuxarm@...wei.com>, <jonathan.cameron@...wei.com>,
	<zhanjie9@...ilicon.com>, <zhenglifeng1@...wei.com>, <yubowen8@...wei.com>,
	<lihuisong@...wei.com>
Subject: [PATCH] ACPI: processor: Fix function defined but not used warning

If CONFIG_ACPI_PROCESSOR=n and CONFIG_ACPI_PROCESSOR_IDLE=n, we may
encounter some compling warnings as the following link said.
So remove these empty function definition because they are just used
in processor_driver.c and if CONFIG_ACPI_PROCESSOR is selected and
CONFIG_ACPI_PROCESSOR_IDLE also be selected automatically.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202508300519.tZQHY6HA-lkp@intel.com/

Signed-off-by: Huisong Li <lihuisong@...wei.com>
---
 include/acpi/processor.h | 34 +++-------------------------------
 1 file changed, 3 insertions(+), 31 deletions(-)

diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 360b673f05e5..a4e1081fd0da 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -417,40 +417,17 @@ static inline void acpi_processor_throttling_init(void) {}
 #endif	/* CONFIG_ACPI_CPU_FREQ_PSS */
 
 /* in processor_idle.c */
-extern struct cpuidle_driver acpi_idle_driver;
 #ifdef CONFIG_ACPI_PROCESSOR_IDLE
+extern struct cpuidle_driver acpi_idle_driver;
 int acpi_processor_power_init(struct acpi_processor *pr);
 int acpi_processor_power_exit(struct acpi_processor *pr);
 int acpi_processor_power_state_has_changed(struct acpi_processor *pr);
 int acpi_processor_hotplug(struct acpi_processor *pr);
 void acpi_processor_register_idle_driver(void);
 void acpi_processor_unregister_idle_driver(void);
-#else
-static inline int acpi_processor_power_init(struct acpi_processor *pr)
-{
-	return -ENODEV;
-}
-
-static inline int acpi_processor_power_exit(struct acpi_processor *pr)
-{
-	return -ENODEV;
-}
-
-static inline int acpi_processor_power_state_has_changed(struct acpi_processor *pr)
-{
-	return -ENODEV;
-}
 
-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)
-{
-}
+extern int acpi_processor_ffh_lpi_probe(unsigned int cpu);
+extern int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi);
 #endif /* CONFIG_ACPI_PROCESSOR_IDLE */
 
 /* in processor_thermal.c */
@@ -473,11 +450,6 @@ static inline void acpi_thermal_cpufreq_exit(struct cpufreq_policy *policy)
 }
 #endif	/* CONFIG_CPU_FREQ */
 
-#ifdef CONFIG_ACPI_PROCESSOR_IDLE
-extern int acpi_processor_ffh_lpi_probe(unsigned int cpu);
-extern int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi);
-#endif
-
 void acpi_processor_init_invariance_cppc(void);
 
 #endif
-- 
2.33.0