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[J-linux.git] / kernel / time / 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
13
14 DECLARE_PER_CPU(unsigned long, timekeeping_mg_floor_swaps);
15
16 static inline void timekeeping_inc_mg_floor_swaps(void)
17 {
18         this_cpu_inc(timekeeping_mg_floor_swaps);
19 }
20
21 extern void tk_debug_account_sleep_time(const struct timespec64 *t);
22
23 #else
24
25 #define tk_debug_account_sleep_time(x)
26
27 static inline void timekeeping_inc_mg_floor_swaps(void)
28 {
29 }
30
31 #endif
32
33 static inline u64 clocksource_delta(u64 now, u64 last, u64 mask, u64 max_delta)
34 {
35         u64 ret = (now - last) & mask;
36
37         /*
38          * Prevent time going backwards by checking the result against
39          * @max_delta. If greater, return 0.
40          */
41         return ret > max_delta ? 0 : ret;
42 }
43
44 /* Semi public for serialization of non timekeeper VDSO updates. */
45 unsigned long timekeeper_lock_irqsave(void);
46 void timekeeper_unlock_irqrestore(unsigned long flags);
47
48 #endif /* _TIMEKEEPING_INTERNAL_H */
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