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