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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
#ifdef CONFIG_CLOCKSOURCE_VALIDATE_LAST_CYCLE
static inline u64 clocksource_delta(u64 now, u64 last, u64 mask)
{
u64 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;
}
#else
static inline u64 clocksource_delta(u64 now, u64 last, u64 mask)
{
return (now - last) & mask;
}
#endif
/* Semi public for serialization of non timekeeper VDSO updates. */
extern raw_spinlock_t timekeeper_lock;
#endif /* _TIMEKEEPING_INTERNAL_H */
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