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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * include/linux/cpuhplock.h - CPU hotplug locking
4 *
5 * Locking functions for CPU hotplug.
6 */
7#ifndef _LINUX_CPUHPLOCK_H_
8#define _LINUX_CPUHPLOCK_H_
9
10#include <linux/cleanup.h>
11#include <linux/errno.h>
12
13struct device;
14
15extern int lockdep_is_cpus_held(void);
16
17#ifdef CONFIG_HOTPLUG_CPU
18void cpus_write_lock(void);
19void cpus_write_unlock(void);
20void cpus_read_lock(void);
21void cpus_read_unlock(void);
22int cpus_read_trylock(void);
23void lockdep_assert_cpus_held(void);
24void cpu_hotplug_disable_offlining(void);
25void cpu_hotplug_disable(void);
26void cpu_hotplug_enable(void);
27void clear_tasks_mm_cpumask(int cpu);
28int remove_cpu(unsigned int cpu);
29int cpu_device_down(struct device *dev);
30void smp_shutdown_nonboot_cpus(unsigned int primary_cpu);
31
32#else /* CONFIG_HOTPLUG_CPU */
33
34static inline void cpus_write_lock(void) { }
35static inline void cpus_write_unlock(void) { }
36static inline void cpus_read_lock(void) { }
37static inline void cpus_read_unlock(void) { }
38static inline int cpus_read_trylock(void) { return true; }
39static inline void lockdep_assert_cpus_held(void) { }
40static inline void cpu_hotplug_disable_offlining(void) { }
41static inline void cpu_hotplug_disable(void) { }
42static inline void cpu_hotplug_enable(void) { }
43static inline int remove_cpu(unsigned int cpu) { return -EPERM; }
44static inline void smp_shutdown_nonboot_cpus(unsigned int primary_cpu) { }
45#endif /* !CONFIG_HOTPLUG_CPU */
46
47DEFINE_LOCK_GUARD_0(cpus_read_lock, cpus_read_lock(), cpus_read_unlock())
48
49#endif /* _LINUX_CPUHPLOCK_H_ */