jiffies.c (a9de18eb761f7c1c860964b2e5addc1a35c7e861) jiffies.c (025dfdafe77f20b3890981a394774baab7b9c827)
1/***********************************************************************
2* linux/kernel/time/jiffies.c
3*
4* This file contains the jiffies based clocksource.
5*
6* Copyright (C) 2004, 2005 IBM, John Stultz (johnstul@us.ibm.com)
7*
8* This program is free software; you can redistribute it and/or modify

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40 * conversion, the .shift value could be zero. However
41 * this would make NTP adjustments impossible as they are
42 * in units of 1/2^.shift. Thus we use JIFFIES_SHIFT to
43 * shift both the nominator and denominator the same
44 * amount, and give ntp adjustments in units of 1/2^8
45 *
46 * The value 8 is somewhat carefully chosen, as anything
47 * larger can result in overflows. NSEC_PER_JIFFY grows as
1/***********************************************************************
2* linux/kernel/time/jiffies.c
3*
4* This file contains the jiffies based clocksource.
5*
6* Copyright (C) 2004, 2005 IBM, John Stultz (johnstul@us.ibm.com)
7*
8* This program is free software; you can redistribute it and/or modify

--- 31 unchanged lines hidden (view full) ---

40 * conversion, the .shift value could be zero. However
41 * this would make NTP adjustments impossible as they are
42 * in units of 1/2^.shift. Thus we use JIFFIES_SHIFT to
43 * shift both the nominator and denominator the same
44 * amount, and give ntp adjustments in units of 1/2^8
45 *
46 * The value 8 is somewhat carefully chosen, as anything
47 * larger can result in overflows. NSEC_PER_JIFFY grows as
48 * HZ shrinks, so values greater then 8 overflow 32bits when
48 * HZ shrinks, so values greater than 8 overflow 32bits when
49 * HZ=100.
50 */
51#define JIFFIES_SHIFT 8
52
53static cycle_t jiffies_read(void)
54{
55 return (cycle_t) jiffies;
56}

--- 17 unchanged lines hidden --- 		49 * HZ=100.
50 */
51#define JIFFIES_SHIFT 8
52
53static cycle_t jiffies_read(void)
54{
55 return (cycle_t) jiffies;
56}

--- 17 unchanged lines hidden ---