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Commit 39f4885c authored by Chandra Seetharaman's avatar Chandra Seetharaman Committed by Linus Torvalds
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[PATCH] cpu hotplug: add hotplug versions of cpu_notifier 



Define new macros register_hotcpu_notifier() and unregister_hotcpu_notifier()
that redefines register_cpu_notifier() and unregister_cpu_notifier() for use
only when HOTPLUG_CPU is defined.

Signed-off-by: default avatarChandra Seetharaman <sekharan@us.ibm.com>
Cc: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 26c2143b

include/linux/cpu.h

+4 −0
Original line number Diff line number Diff line
@@ -79,6 +79,8 @@ extern int lock_cpu_hotplug_interruptible(void); 
		{ .notifier_call = fn, .priority = pri };	\

	register_cpu_notifier(&fn##_nb);			\

}

#define register_hotcpu_notifier(nb)	register_cpu_notifier(nb)

#define unregister_hotcpu_notifier(nb)	unregister_cpu_notifier(nb)

int cpu_down(unsigned int cpu);

#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))

#else
@@ -86,6 +88,8 @@ int cpu_down(unsigned int cpu); 
#define unlock_cpu_hotplug()	do { } while (0)

#define lock_cpu_hotplug_interruptible() 0

#define hotcpu_notifier(fn, pri)

#define register_hotcpu_notifier(nb)

#define unregister_hotcpu_notifier(nb)



/* CPUs don't go offline once they're online w/o CONFIG_HOTPLUG_CPU */

static inline int cpu_is_offline(int cpu) { return 0; }