Release 4.9 kernel/time/timekeeping_internal.h

#ifndef _TIMEKEEPING_INTERNAL_H

#define _TIMEKEEPING_INTERNAL_H
/*
 * timekeeping debug functions
 */
#include <linux/clocksource.h>
#include <linux/time.h>

#ifdef CONFIG_DEBUG_FS
extern void tk_debug_account_sleep_time(struct timespec64 *t);
#else

#define tk_debug_account_sleep_time(x)
#endif

#ifdef CONFIG_CLOCKSOURCE_VALIDATE_LAST_CYCLE


static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t mask)
{
	cycle_t ret = (now - last) & mask;

	/*
         * Prevent time going backwards by checking the MSB of mask in
         * the result. If set, return 0.
         */
	return ret & ~(mask >> 1) ? 0 : ret;
}
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#else


static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t mask)
{
	return (now - last) & mask;
}
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#endif

extern time64_t __ktime_get_real_seconds(void);

#endif /* _TIMEKEEPING_INTERNAL_H */
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Directory: kernel/time