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Commit 1ac8a0b1 authored by qctecmdr's avatar qctecmdr Committed by Gerrit - the friendly Code Review server
Browse files

Merge "arm64: Call idle notifiers in CPU idle"

parents d9393f0d 57d8c7d3

arch/arm64/kernel/process.c

+10 −0
Original line number Diff line number Diff line
@@ -128,6 +128,16 @@ void arch_cpu_idle(void) 
	trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());

}



void arch_cpu_idle_enter(void)

{

	idle_notifier_call_chain(IDLE_START);

}



void arch_cpu_idle_exit(void)

{

	idle_notifier_call_chain(IDLE_END);

}



#ifdef CONFIG_HOTPLUG_CPU

void arch_cpu_idle_dead(void)

{

include/linux/cpu.h

+7 −0
Original line number Diff line number Diff line
@@ -221,4 +221,11 @@ static inline int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval) { return 0; 
extern bool cpu_mitigations_off(void);

extern bool cpu_mitigations_auto_nosmt(void);



#define IDLE_START 1

#define IDLE_END 2



void idle_notifier_register(struct notifier_block *n);

void idle_notifier_unregister(struct notifier_block *n);

void idle_notifier_call_chain(unsigned long val);



#endif /* _LINUX_CPU_H_ */

kernel/cpu.c

+20 −0
Original line number Diff line number Diff line
@@ -2498,3 +2498,23 @@ bool cpu_mitigations_auto_nosmt(void) 
	return cpu_mitigations == CPU_MITIGATIONS_AUTO_NOSMT;

}

EXPORT_SYMBOL_GPL(cpu_mitigations_auto_nosmt);



static ATOMIC_NOTIFIER_HEAD(idle_notifier);



void idle_notifier_register(struct notifier_block *n)

{

	atomic_notifier_chain_register(&idle_notifier, n);

}

EXPORT_SYMBOL_GPL(idle_notifier_register);



void idle_notifier_unregister(struct notifier_block *n)

{

	atomic_notifier_chain_unregister(&idle_notifier, n);

}

EXPORT_SYMBOL_GPL(idle_notifier_unregister);



void idle_notifier_call_chain(unsigned long val)

{

	atomic_notifier_call_chain(&idle_notifier, val, NULL);

}

EXPORT_SYMBOL_GPL(idle_notifier_call_chain);