mm/page_alloc: prevent merging between isolated and other pageblocks
[linux-2.6-block.git] / kernel / time / timekeeping_internal.h
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1#ifndef _TIMEKEEPING_INTERNAL_H
2#define _TIMEKEEPING_INTERNAL_H
3/*
4 * timekeeping debug functions
5 */
3a978377 6#include <linux/clocksource.h>
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7#include <linux/time.h>
8
9#ifdef CONFIG_DEBUG_FS
7d489d15 10extern void tk_debug_account_sleep_time(struct timespec64 *t);
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11#else
12#define tk_debug_account_sleep_time(x)
13#endif
14
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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
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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;
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25}
26#else
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27static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t mask)
28{
29 return (now - last) & mask;
30}
09ec5442 31#endif
3a978377 32
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33extern time64_t __ktime_get_real_seconds(void);
34
5c83545f 35#endif /* _TIMEKEEPING_INTERNAL_H */