linux-imx

/* SPDX-License-Identifier: GPL-2.0 */

#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(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

​

#endif /* _TIMEKEEPING_INTERNAL_H */