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[PATCH] fix and optimize clock source update

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This fixes the clock source updates in update_wall_time() to correctly
track the time coming in via current_tick_length().  Optimize the fast
paths to be as short as possible to keep the overhead low.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Acked-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Roman Zippel 2006-06-26 00:25:18 -07:00 • committed by Linus Torvalds
parent 6415ce9a92
commit 19923c190e
4 changed files with 124 additions and 150 deletions
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4
include/linux/timex.h
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@ -303,8 +303,10 @@ time_interpolator_reset(void)
#endif /* !CONFIG_TIME_INTERPOLATION */
#define TICK_LENGTH_SHIFT 32
/* Returns how long ticks are at present, in ns / 2^(SHIFT_SCALE-10). */
extern u64 current_tick_length(long);
extern u64 current_tick_length(void);
extern int do_adjtimex(struct timex *);