Commit 799e64f0 authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Ingo Molnar
Browse files

cpu hotplug: Introduce cpu_notifier() to handle !HOTPLUG_CPU case 



This patch introduces a new cpu_notifier() API that is similar
to hotcpu_notifier(), but which also notifies of CPUs coming
online during boot in the !HOTPLUG_CPU case.

Reported-by: default avatarIngo Molnar <mingo@elte.hu>
Reported-by: default avatarHugh Dickins <hugh.dickins@tiscali.co.uk>
Tested-by: default avatarHugh Dickins <hugh.dickins@tiscali.co.uk>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: josht@linux.vnet.ibm.com
Cc: akpm@linux-foundation.org
Cc: mathieu.desnoyers@polymtl.ca
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: benh@kernel.crashing.org
LKML-Reference: <12503552312611-git-send-email->
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 27569620

include/linux/cpu.h

+12 −5
Original line number Diff line number Diff line
@@ -48,6 +48,15 @@ struct notifier_block; 


#ifdef CONFIG_SMP

/* Need to know about CPUs going up/down? */

#if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)

#define cpu_notifier(fn, pri) {					\

	static struct notifier_block fn##_nb __cpuinitdata =	\

		{ .notifier_call = fn, .priority = pri };	\

	register_cpu_notifier(&fn##_nb);			\

}

#else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */

#define cpu_notifier(fn, pri)	do { (void)(fn); } while (0)

#endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */

#ifdef CONFIG_HOTPLUG_CPU

extern int register_cpu_notifier(struct notifier_block *nb);

extern void unregister_cpu_notifier(struct notifier_block *nb);
@@ -74,6 +83,8 @@ extern void cpu_maps_update_done(void); 


#else	/* CONFIG_SMP */



#define cpu_notifier(fn, pri)	do { (void)(fn); } while (0)



static inline int register_cpu_notifier(struct notifier_block *nb)

{

	return 0;
@@ -99,11 +110,7 @@ extern struct sysdev_class cpu_sysdev_class; 


extern void get_online_cpus(void);

extern void put_online_cpus(void);

#define hotcpu_notifier(fn, pri) {				\

	static struct notifier_block fn##_nb __cpuinitdata =	\

		{ .notifier_call = fn, .priority = pri };	\

	register_cpu_notifier(&fn##_nb);			\

}

#define hotcpu_notifier(fn, pri)	cpu_notifier(fn, pri)

#define register_hotcpu_notifier(nb)	register_cpu_notifier(nb)

#define unregister_hotcpu_notifier(nb)	unregister_cpu_notifier(nb)

int cpu_down(unsigned int cpu);

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