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cpuset modifies partitions, including isolated, while holding the cpu hotplug lock read-held. This means that write-holding the CPU hotplug lock is safe to synchronize against housekeeping cpumask changes. Provide a lockdep check to validate that. Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Cc: Marco Crivellari <marco.crivellari@suse.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Tejun Heo <tj@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Waiman Long <longman@redhat.com> Cc: linux-kernel@vger.kernel.org
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* include/linux/cpuhplock.h - CPU hotplug locking
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*
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* Locking functions for CPU hotplug.
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*/
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#ifndef _LINUX_CPUHPLOCK_H_
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#define _LINUX_CPUHPLOCK_H_
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#include <linux/cleanup.h>
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#include <linux/errno.h>
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struct device;
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extern int lockdep_is_cpus_held(void);
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extern int lockdep_is_cpus_write_held(void);
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#ifdef CONFIG_HOTPLUG_CPU
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void cpus_write_lock(void);
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void cpus_write_unlock(void);
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void cpus_read_lock(void);
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void cpus_read_unlock(void);
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int cpus_read_trylock(void);
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void lockdep_assert_cpus_held(void);
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void cpu_hotplug_disable_offlining(void);
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void cpu_hotplug_disable(void);
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void cpu_hotplug_enable(void);
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void clear_tasks_mm_cpumask(int cpu);
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int remove_cpu(unsigned int cpu);
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int cpu_device_down(struct device *dev);
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void smp_shutdown_nonboot_cpus(unsigned int primary_cpu);
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#else /* CONFIG_HOTPLUG_CPU */
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static inline void cpus_write_lock(void) { }
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static inline void cpus_write_unlock(void) { }
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static inline void cpus_read_lock(void) { }
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static inline void cpus_read_unlock(void) { }
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static inline int cpus_read_trylock(void) { return true; }
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static inline void lockdep_assert_cpus_held(void) { }
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static inline void cpu_hotplug_disable_offlining(void) { }
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static inline void cpu_hotplug_disable(void) { }
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static inline void cpu_hotplug_enable(void) { }
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static inline int remove_cpu(unsigned int cpu) { return -EPERM; }
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static inline void smp_shutdown_nonboot_cpus(unsigned int primary_cpu) { }
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#endif /* !CONFIG_HOTPLUG_CPU */
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DEFINE_LOCK_GUARD_0(cpus_read_lock, cpus_read_lock(), cpus_read_unlock())
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#endif /* _LINUX_CPUHPLOCK_H_ */
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