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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _TIMEKEEPING_INTERNAL_H
#define _TIMEKEEPING_INTERNAL_H
#include <linux/clocksource.h>
#include <linux/spinlock.h>
#include <linux/time.h>
/*
* timekeeping debug functions
*/
#ifdef CONFIG_DEBUG_FS
extern void tk_debug_account_sleep_time(const struct timespec64 *t);
#else
#define tk_debug_account_sleep_time(x)
#endif
static inline u64 clocksource_delta(u64 now, u64 last, u64 mask, u64 max_delta)
{
u64 ret = (now - last) & mask;
/*
* Prevent time going backwards by checking the result against
* @max_delta. If greater, return 0.
*/
return ret > max_delta ? 0 : ret;
}
/* Semi public for serialization of non timekeeper VDSO updates. */
extern raw_spinlock_t timekeeper_lock;
#endif /* _TIMEKEEPING_INTERNAL_H */
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