1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _TIMEKEEPING_INTERNAL_H
 3#define _TIMEKEEPING_INTERNAL_H
 4/*
 5 * timekeeping debug functions
 6 */
 7#include <linux/clocksource.h>
 
 8#include <linux/time.h>
 9
 
 
 
10#ifdef CONFIG_DEBUG_FS
11extern void tk_debug_account_sleep_time(const struct timespec64 *t);
12#else
13#define tk_debug_account_sleep_time(x)
14#endif
15
16#ifdef CONFIG_CLOCKSOURCE_VALIDATE_LAST_CYCLE
17static inline u64 clocksource_delta(u64 now, u64 last, u64 mask)
18{
19	u64 ret = (now - last) & mask;
20
21	/*
22	 * Prevent time going backwards by checking the MSB of mask in
23	 * the result. If set, return 0.
24	 */
25	return ret & ~(mask >> 1) ? 0 : ret;
26}
27#else
28static inline u64 clocksource_delta(u64 now, u64 last, u64 mask)
29{
30	return (now - last) & mask;
31}
32#endif
 
 
 
33
34#endif /* _TIMEKEEPING_INTERNAL_H */

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _TIMEKEEPING_INTERNAL_H
 3#define _TIMEKEEPING_INTERNAL_H
 4
 
 
 5#include <linux/clocksource.h>
 6#include <linux/spinlock.h>
 7#include <linux/time.h>
 8
 9/*
10 * timekeeping debug functions
11 */
12#ifdef CONFIG_DEBUG_FS
13extern void tk_debug_account_sleep_time(const struct timespec64 *t);
14#else
15#define tk_debug_account_sleep_time(x)
16#endif
17
18#ifdef CONFIG_CLOCKSOURCE_VALIDATE_LAST_CYCLE
19static inline u64 clocksource_delta(u64 now, u64 last, u64 mask)
20{
21	u64 ret = (now - last) & mask;
22
23	/*
24	 * Prevent time going backwards by checking the MSB of mask in
25	 * the result. If set, return 0.
26	 */
27	return ret & ~(mask >> 1) ? 0 : ret;
28}
29#else
30static inline u64 clocksource_delta(u64 now, u64 last, u64 mask)
31{
32	return (now - last) & mask;
33}
34#endif
35
36/* Semi public for serialization of non timekeeper VDSO updates. */
37extern raw_spinlock_t timekeeper_lock;
38
39#endif /* _TIMEKEEPING_INTERNAL_H */