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| author | Ingo Molnar <mingo@elte.hu> | 2009-02-22 12:17:36 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-02-25 18:38:10 +0100 |
| commit | bc26c31d446bc9c24cd6f7003777a05fe268ae48 (patch) | |
| tree | 26b1738745cd7f81af2259239799a0798cbe212b /kernel/time | |
| parent | time: ntp: clean up ntp_update_frequency() (diff) | |
| download | linux-bc26c31d446bc9c24cd6f7003777a05fe268ae48.tar.xz linux-bc26c31d446bc9c24cd6f7003777a05fe268ae48.zip | |
time: ntp: refactor up ntp_update_frequency()
Impact: cleanup, no functionality changed
Change ntp_update_frequency() from a hard to follow code
flow that uses global variables as temporaries, to a clean
input+output flow.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/ntp.c | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c index 7d281d9fbe30..f1abad738579 100644 --- a/kernel/time/ntp.c +++ b/kernel/time/ntp.c @@ -83,10 +83,8 @@ static long ntp_tick_adj; */ static void ntp_update_frequency(void) { - u64 prev_base; u64 second_length; - - prev_base = tick_length_base; + u64 new_base; second_length = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ) << NTP_SCALE_SHIFT; @@ -94,16 +92,15 @@ static void ntp_update_frequency(void) second_length += (s64)ntp_tick_adj << NTP_SCALE_SHIFT; second_length += time_freq; - 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); + new_base = div_u64(second_length, NTP_INTERVAL_FREQ); /* * Don't wait for the next second_overflow, apply - * the change to the tick length immediately + * the change to the tick length immediately: */ - tick_length += tick_length_base - prev_base; + tick_length += new_base - tick_length_base; + tick_length_base = new_base; } static void ntp_update_offset(long offset) |