ntp: remove current_tick_length()

current_tick_length used to do a little more, but now it just returns
tick_length, which we can also access directly at the few places, where it's
needed.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 6 insertions, 19 deletions

diff --git a/include/linux/timex.h b/include/linux/timex.h
index 5994d39de778..da431f8c5c6e 100644
--- a/include/linux/timex.h
+++ b/include/linux/timex.h
@@ -239,8 +239,8 @@ static inline int ntp_synced(void)
 #endif
 #define NTP_INTERVAL_LENGTH (NSEC_PER_SEC/NTP_INTERVAL_FREQ)
 
-/* Returns how long ticks are at present, in ns / 2^(SHIFT_SCALE-10). */
-extern u64 current_tick_length(void);
+/* Returns how long ticks are at present, in ns / 2^NTP_SCALE_SHIFT. */
+extern u64 tick_length;
 
 extern void second_overflow(void);
 extern void update_ntp_one_tick(void);
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index a8fd1ba1ef19..df9718bac8d0 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -23,7 +23,8 @@
  */
 unsigned long tick_usec = TICK_USEC;            /* USER_HZ period (usec) */
 unsigned long tick_nsec;                        /* ACTHZ period (nsec) */
-static u64 tick_length, tick_length_base;
+u64 tick_length;
+static u64 tick_length_base;
 
 #define MAX_TICKADJ             500             /* microsecs */
 #define MAX_TICKADJ_SCALED      (((u64)(MAX_TICKADJ * NSEC_PER_USEC) << \
@@ -203,19 +204,6 @@ void second_overflow(void)
         }
 }
 
-/*
- * Return how long ticks are at the moment, that is, how much time
- * update_wall_time_one_tick will add to xtime next time we call it
- * (assuming no calls to do_adjtimex in the meantime).
- * The return value is in fixed-point nanoseconds shifted by the
- * specified number of bits to the right of the binary point.
- * This function has no side-effects.
- */
-u64 current_tick_length(void)
-{
-        return tick_length;
-}
-
 #ifdef CONFIG_GENERIC_CMOS_UPDATE
 
 /* Disable the cmos update - used by virtualization and embedded */
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index a26429bc772a..7e74d8092067 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -380,8 +380,7 @@ static __always_inline int clocksource_bigadjust(s64 error, s64 *interval,
          * Now calculate the error in (1 << look_ahead) ticks, but first
          * remove the single look ahead already included in the error.
          */
-        tick_error = current_tick_length() >>
-                (NTP_SCALE_SHIFT - clock->shift + 1);
+        tick_error = tick_length >> (NTP_SCALE_SHIFT - clock->shift + 1);
         tick_error -= clock->xtime_interval >> 1;
         error = ((error - tick_error) >> look_ahead) + tick_error;
 
@@ -473,7 +472,7 @@ void update_wall_time(void)
                 }
 
                 /* accumulate error between NTP and clock interval */
-                clock->error += current_tick_length();
+                clock->error += tick_length;
                 clock->error -= clock->xtime_interval << (NTP_SCALE_SHIFT - clock->shift);
         }