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-rw-r--r--kernel/time/ntp.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 7447d57e021..a3fe7ef2d83 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -71,7 +71,8 @@ static long time_reftime;
long time_adjust;
-static long ntp_tick_adj;
+/* constant (boot-param configurable) NTP tick adjustment (upscaled) */
+static s64 ntp_tick_adj;
/*
* NTP methods:
@@ -89,7 +90,7 @@ static void ntp_update_frequency(void)
second_length = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ)
<< NTP_SCALE_SHIFT;
- second_length += (s64)ntp_tick_adj << NTP_SCALE_SHIFT;
+ second_length += ntp_tick_adj;
second_length += time_freq;
tick_nsec = div_u64(second_length, HZ) >> NTP_SCALE_SHIFT;
@@ -540,6 +541,8 @@ int do_adjtimex(struct timex *txc)
static int __init ntp_tick_adj_setup(char *str)
{
ntp_tick_adj = simple_strtol(str, NULL, 0);
+ ntp_tick_adj <<= NTP_SCALE_SHIFT;
+
return 1;
}