1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _PVCLOCK_GTOD_H
3 #define _PVCLOCK_GTOD_H
4 
5 #include <linux/notifier.h>
6 
7 /*
8  * The pvclock gtod notifier is called when the system time is updated
9  * and is used to keep guest time synchronized with host time.
10  *
11  * The 'action' parameter in the notifier function is false (0), or
12  * true (non-zero) if system time was stepped.
13  */
14 extern int pvclock_gtod_register_notifier(struct notifier_block *nb);
15 extern int pvclock_gtod_unregister_notifier(struct notifier_block *nb);
16 
17 #endif /* _PVCLOCK_GTOD_H */
18