The unregister notifier function is needed to support cpu hotplug.
Signed-off-by: Wei Wang <wei.w.w...@intel.com>
---
xen/common/cpu.c | 7 +++++++
xen/include/xen/cpu.h | 1 +
2 files changed, 8 insertions(+)
diff --git a/xen/common/cpu.c b/xen/common/cpu.c
index 47e8b5b..508cee5 100644
--- a/xen/common/cpu.c
+++ b/xen/common/cpu.c
@@ -68,6 +68,13 @@ void __init register_cpu_notifier(struct notifier_block *nb)
spin_unlock(&cpu_add_remove_lock);
}
+void __init unregister_cpu_notifier(struct notifier_block *nb) {
+ if ( !spin_trylock(&cpu_add_remove_lock) )
+ BUG();
+ notifier_chain_unregister(&cpu_chain, nb);
+ spin_unlock(&cpu_add_remove_lock);
+}
+
static int take_cpu_down(void *unused)
{
void *hcpu = (void *)(long)smp_processor_id();
diff --git a/xen/include/xen/cpu.h b/xen/include/xen/cpu.h
index ffefc09..17a3503 100644
--- a/xen/include/xen/cpu.h
+++ b/xen/include/xen/cpu.h
@@ -15,6 +15,7 @@ void cpu_hotplug_done(void);
/* Receive notification of CPU hotplug events. */
void register_cpu_notifier(struct notifier_block *nb);
+void unregister_cpu_notifier(struct notifier_block *nb);
/*
* Possible event sequences for a given CPU:
--
1.9.1
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