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Commit a1a04ec3 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

idle: Provide a generic entry point for the idle code 



For now this calls cpu_idle(), but in the long run we want to move the
cpu bringup code to the core and therefor we add a state argument.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: default avatarCc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Link: http://lkml.kernel.org/r/20130321215233.583190032@linutronix.de


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 3a98f871

include/linux/cpu.h

+8 −0
Original line number Diff line number Diff line
@@ -212,4 +212,12 @@ static inline int disable_nonboot_cpus(void) { return 0; } 
static inline void enable_nonboot_cpus(void) {}

#endif /* !CONFIG_PM_SLEEP_SMP */



enum cpuhp_state {

	CPUHP_OFFLINE,

	CPUHP_ONLINE,

};



void cpu_startup_entry(enum cpuhp_state state);

void cpu_idle(void);



#endif /* _LINUX_CPU_H_ */

init/main.c

+1 −1
Original line number Diff line number Diff line
@@ -384,7 +384,7 @@ static noinline void __init_refok rest_init(void) 
	init_idle_bootup_task(current);

	schedule_preempt_disabled();

	/* Call into cpu_idle with preempt disabled */

	cpu_idle();

	cpu_startup_entry(CPUHP_ONLINE);

}



/* Check for early params. */

kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ endif 


obj-y += sched/

obj-y += power/

obj-y += cpu/



obj-$(CONFIG_CHECKPOINT_RESTORE) += kcmp.o

obj-$(CONFIG_FREEZER) += freezer.o

kernel/cpu/Makefile

0 → 100644
+1 −0
Original line number Diff line number Diff line 
obj-y	= idle.o

kernel/cpu/idle.c

0 → 100644
+10 −0
Original line number Diff line number Diff line 
/*

 * Generic entry point for the idle threads

 */

#include <linux/sched.h>

#include <linux/cpu.h>



void cpu_startup_entry(enum cpuhp_state state)

{

	cpu_idle();

}