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authorChandra Seetharaman <sekharan@us.ibm.com>2006-06-27 02:54:08 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-27 17:32:41 -0700
commit65edc68c345cbe21d0b0375c3452a3ed5e322868 (patch)
tree07961d63cdacf95355a8db471c6ff4e321ca94fd /kernel/cpu.c
parent054cc8a2d808822dadf488a61729e3e550f114c4 (diff)
downloadlwn-65edc68c345cbe21d0b0375c3452a3ed5e322868.tar.gz
lwn-65edc68c345cbe21d0b0375c3452a3ed5e322868.zip
[PATCH] cpu hotplug: make [un]register_cpu_notifier init time only
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>
Diffstat (limited to 'kernel/cpu.c')
-rw-r--r--kernel/cpu.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 03dcd981846a..70fbf2e83766 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -18,7 +18,7 @@
/* This protects CPUs going up and down... */
static DEFINE_MUTEX(cpucontrol);
-static BLOCKING_NOTIFIER_HEAD(cpu_chain);
+static __cpuinitdata BLOCKING_NOTIFIER_HEAD(cpu_chain);
#ifdef CONFIG_HOTPLUG_CPU
static struct task_struct *lock_cpu_hotplug_owner;
@@ -69,10 +69,13 @@ EXPORT_SYMBOL_GPL(lock_cpu_hotplug_interruptible);
#endif /* CONFIG_HOTPLUG_CPU */
/* Need to know about CPUs going up/down? */
-int register_cpu_notifier(struct notifier_block *nb)
+int __cpuinit register_cpu_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&cpu_chain, nb);
}
+
+#ifdef CONFIG_HOTPLUG_CPU
+
EXPORT_SYMBOL(register_cpu_notifier);
void unregister_cpu_notifier(struct notifier_block *nb)
@@ -81,7 +84,6 @@ void unregister_cpu_notifier(struct notifier_block *nb)
}
EXPORT_SYMBOL(unregister_cpu_notifier);
-#ifdef CONFIG_HOTPLUG_CPU
static inline void check_for_tasks(int cpu)
{
struct task_struct *p;