1#ifndef _TIMEKEEPING_INTERNAL_H
 2#define _TIMEKEEPING_INTERNAL_H
 3/*
 4 * timekeeping debug functions
 5 */
 6#include <linux/clocksource.h>
 7#include <linux/time.h>
 8
 9#ifdef CONFIG_DEBUG_FS
10extern void tk_debug_account_sleep_time(struct timespec64 *t);
11#else
12#define tk_debug_account_sleep_time(x)
13#endif
14
15#ifdef CONFIG_CLOCKSOURCE_VALIDATE_LAST_CYCLE
16static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t mask)
17{
18	cycle_t ret = (now - last) & mask;
19
20	/*
21	 * Prevent time going backwards by checking the MSB of mask in
22	 * the result. If set, return 0.
23	 */
24	return ret & ~(mask >> 1) ? 0 : ret;
25}
26#else
27static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t mask)
28{
29	return (now - last) & mask;
30}
31#endif
32
33extern time64_t __ktime_get_real_seconds(void);
34
35#endif /* _TIMEKEEPING_INTERNAL_H */