Author: Ingo Molnar <mingo@xxxxxxx>
AuthorDate: Sun, 22 Feb 2009 12:42:59 +0100
Commit: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Wed, 25 Feb 2009 18:38:09 +0100
time: ntp: clean up ntp_update_frequency()
Impact: cleanup, no functionality changed
Prepare a refactoring of ntp_update_frequency().
kernel/time/ntp.o:
text data bss dec hex filename
2504 114 136 2754 ac2 ntp.o.before
2504 114 136 2754 ac2 ntp.o.after
md5:
41f3009debc9b397d7394dd77d912f0a ntp.o.before.asm
41f3009debc9b397d7394dd77d912f0a ntp.o.after.asm
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
kernel/time/ntp.c | 27 ++++++++++++++++++---------
1 files changed, 18 insertions(+), 9 deletions(-)
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 2b758c9..7d281d9 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -77,24 +77,33 @@ static long ntp_tick_adj;
* NTP methods:
*/
+/*
+ * Update (tick_length, tick_length_base, tick_nsec), based
+ * on (tick_usec, ntp_tick_adj, time_freq):
+ */
static void ntp_update_frequency(void)
{
- u64 old_tick_length_base = tick_length_base;
- u64 second_length = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ)
- << NTP_SCALE_SHIFT;
- second_length += (s64)ntp_tick_adj << NTP_SCALE_SHIFT;
- second_length += time_freq;
+ u64 prev_base;
+ u64 second_length;
+
+ prev_base = tick_length_base;
+
+ second_length = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ)
+ << NTP_SCALE_SHIFT;
+
+ second_length += (s64)ntp_tick_adj << NTP_SCALE_SHIFT;
+ second_length += time_freq;
- tick_length_base = second_length;
+ tick_length_base = second_length;
- tick_nsec = div_u64(second_length, HZ) >> NTP_SCALE_SHIFT;
- tick_length_base = div_u64(tick_length_base, NTP_INTERVAL_FREQ);
+ tick_nsec = div_u64(second_length, HZ) >> NTP_SCALE_SHIFT;
+ tick_length_base = div_u64(tick_length_base, NTP_INTERVAL_FREQ);
/*
* Don't wait for the next second_overflow, apply
* the change to the tick length immediately
*/
- tick_length += tick_length_base - old_tick_length_base;
+ tick_length += tick_length_base - prev_base;
}
static void ntp_update_offset(long offset)
--
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