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-rw-r--r--kernel/time/ntp.c27
1 files changed, 18 insertions, 9 deletions
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 2b758c935c65..7d281d9fbe30 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)