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-rw-r--r--kernel/smpboot.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/smpboot.c b/kernel/smpboot.c
index 5e46c2a75d59..7c434c39f02a 100644
--- a/kernel/smpboot.c
+++ b/kernel/smpboot.c
@@ -338,6 +338,7 @@ EXPORT_SYMBOL_GPL(smpboot_unregister_percpu_thread);
*
* The cpumask field in the smp_hotplug_thread must not be updated directly
* by the client, but only by calling this function.
+ * This function can only be called on a registered smp_hotplug_thread.
*/
int smpboot_update_cpumask_percpu_thread(struct smp_hotplug_thread *plug_thread,
const struct cpumask *new)