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[PATCH] cpu hotplug: add hotplug versions of cpu_notifier

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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: Chandra Seetharaman <[email protected]>
Cc: Ashok Raj <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Chandra Seetharaman authored and Linus Torvalds committed 2006-06-27 17:32:41 -07:00
1 parent 26c2143b63
commit 39f4885c56
1 file changed
+4
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include/linux/cpu.h
+4
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@@ -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; }