kernel/cpu.c: Add comment for priority in cpu_hotplug_pm_callback

[karo-tx-linux.git] / kernel / cpu.c

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 42bd331ee0abff1d542583e14beb20d91f6fae62..a2491a2d62bbb568cdaf6f68873b7436977cf544 100644 (file)
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -601,6 +601,11 @@ cpu_hotplug_pm_callback(struct notifier_block *nb,
 
 static int __init cpu_hotplug_pm_sync_init(void)
 {
+       /*
+        * cpu_hotplug_pm_callback has higher priority than x86
+        * bsp_pm_callback which depends on cpu_hotplug_pm_callback
+        * to disable cpu hotplug to avoid cpu hotplug race.
+        */
        pm_notifier(cpu_hotplug_pm_callback, 0);
        return 0;
 }