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[PATCH] cpu hotplug: make [un]register_cpu_notifier init time only

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CPUs come online only at init time (unless CONFIG_HOTPLUG_CPU is defined).
So, cpu_notifier functionality need to be available only at init time.

This patch makes register_cpu_notifier() available only at init time, unless
CONFIG_HOTPLUG_CPU is defined.

This patch exports register_cpu_notifier() and unregister_cpu_notifier() only
if CONFIG_HOTPLUG_CPU is defined.

Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Cc: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Chandra Seetharaman 2006-06-27 02:54:08 -07:00 • committed by Linus Torvalds
parent 054cc8a2d8
commit 65edc68c34
4 changed files with 18 additions and 8 deletions
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6
include/linux/cpu.h
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@ -41,7 +41,13 @@ struct notifier_block;
#ifdef CONFIG_SMP
/* Need to know about CPUs going up/down? */
extern int register_cpu_notifier(struct notifier_block *nb);
#ifdef CONFIG_HOTPLUG_CPU
extern void unregister_cpu_notifier(struct notifier_block *nb);
#else
static inline void unregister_cpu_notifier(struct notifier_block *nb)
{
}
#endif
extern int current_in_cpu_hotplug(void);
int cpu_up(unsigned int cpu);