Man page 9 : schedule_hrtimeout

schedule_hrtimeout - sleep until timeout

int __sched schedule_hrtimeout(ktime_t *  expires , const enum hrtimer_mode  mode );

expires
    timeout value (ktime_t)

mode
    timer mode, HRTIMER_MODE_ABS or HRTIMER_MODE_REL

Make the current task sleep until the given expiry time has elapsed. The routine will return immediately unless the current task state has been set (see set_current_state).

You can set the task state as follows -

TASK_UNINTERRUPTIBLE - at least timeout time is guaranteed to pass before the routine returns.

TASK_INTERRUPTIBLE - the routine may return early if a signal is delivered to the current task.

The current task state is guaranteed to be TASK_RUNNING when this routine returns.

Returns 0 when the timer has expired otherwise -EINTR