171 	static int firsttime = 1;  in do_sys_settimeofday64()
372  * two most common HZ cases:
376 #if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)  in jiffies_to_msecs()
377 	return (MSEC_PER_SEC / HZ) * j;  in jiffies_to_msecs()
378 #elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)  in jiffies_to_msecs()
379 	return (j + (HZ / MSEC_PER_SEC) - 1)/(HZ / MSEC_PER_SEC);  in jiffies_to_msecs()
382 	return (HZ_TO_MSEC_MUL32 * j + (1ULL << HZ_TO_MSEC_SHR32) - 1) >>  in jiffies_to_msecs()
394 	 * Hz usually doesn't go much further MSEC_PER_SEC.  in jiffies_to_usecs()
397 	BUILD_BUG_ON(HZ > USEC_PER_SEC);  in jiffies_to_usecs()
399 #if !(USEC_PER_SEC % HZ)  in jiffies_to_usecs()
400 	return (USEC_PER_SEC / HZ) * j;  in jiffies_to_usecs()
437 	/* 1..12 -> 11,12,1..10 */  in mktime64()
440 		year -= 1;  in mktime64()
520 		ts.tv_sec = -div_u64_rem(-nsec - 1, NSEC_PER_SEC, &rem) - 1;  in ns_to_timespec64()
521 		ts.tv_nsec = NSEC_PER_SEC - rem - 1;  in ns_to_timespec64()
549  * the _msecs_to_jiffies helpers are the HZ dependent conversion
572  * The TICK_NSEC - 1 rounds up the value to the next resolution.  Note
591 	long nsec = value->tv_nsec + TICK_NSEC - 1;  in timespec64_to_jiffies()
624 # if HZ < USER_HZ  in jiffies_to_clock_t()
625 	return x * (USER_HZ / HZ);  in jiffies_to_clock_t()
627 	return x / (HZ / USER_HZ);  in jiffies_to_clock_t()
637 #if (HZ % USER_HZ)==0  in clock_t_to_jiffies()
638 	if (x >= ~0UL / (HZ / USER_HZ))  in clock_t_to_jiffies()
640 	return x * (HZ / USER_HZ);  in clock_t_to_jiffies()
643 	if (x >= ~0UL / HZ * USER_HZ)  in clock_t_to_jiffies()
647 	return div_u64((u64)x * HZ, USER_HZ);  in clock_t_to_jiffies()
655 # if HZ < USER_HZ  in jiffies_64_to_clock_t()
656 	x = div_u64(x * USER_HZ, HZ);  in jiffies_64_to_clock_t()
657 # elif HZ > USER_HZ  in jiffies_64_to_clock_t()
658 	x = div_u64(x, HZ / USER_HZ);  in jiffies_64_to_clock_t()
684          * exact for HZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ...  in nsec_to_clock_t()
692 #if !(NSEC_PER_SEC % HZ)  in jiffies64_to_nsecs()
693 	return (NSEC_PER_SEC / HZ) * j;  in jiffies64_to_nsecs()
702 #if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)  in jiffies64_to_msecs()
703 	return (MSEC_PER_SEC / HZ) * j;  in jiffies64_to_msecs()
725 #if (NSEC_PER_SEC % HZ) == 0  in nsecs_to_jiffies64()
726 	/* Common case, HZ = 100, 128, 200, 250, 256, 500, 512, 1000 etc. */  in nsecs_to_jiffies64()
727 	return div_u64(n, NSEC_PER_SEC / HZ);  in nsecs_to_jiffies64()
728 #elif (HZ % 512) == 0  in nsecs_to_jiffies64()
729 	/* overflow after 292 years if HZ = 1024 */  in nsecs_to_jiffies64()
730 	return div_u64(n * HZ / 512, NSEC_PER_SEC / 512);  in nsecs_to_jiffies64()
733 	 * Generic case - optimized for cases where HZ is a multiple of 3.  in nsecs_to_jiffies64()
734 	 * overflow after 64.99 years, exact for HZ = 60, 72, 90, 120 etc.  in nsecs_to_jiffies64()
736 	return div_u64(n * 9, (9ull * NSEC_PER_SEC + HZ / 2) / HZ);  in nsecs_to_jiffies64()