[PATCH] fix and optimize clock source update

This fixes the clock source updates in update_wall_time() to correctly
track the time coming in via current_tick_length().  Optimize the fast
paths to be as short as possible to keep the overhead low.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Acked-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 742f07a63161..7dd5dab789a1 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -102,7 +102,7 @@ EXPORT_SYMBOL(tb_ticks_per_sec);	/* for cputime_t conversions */
 u64 tb_to_xs;
 unsigned tb_to_us;
 
-#define TICKLEN_SCALE   (SHIFT_SCALE - 10)
+#define TICKLEN_SCALE   TICK_LENGTH_SHIFT
 u64 last_tick_len;      /* units are ns / 2^TICKLEN_SCALE */
 u64 ticklen_to_xs;      /* 0.64 fraction */
 
@@ -534,7 +534,7 @@ static __inline__ void timer_recalc_offset(u64 cur_tb)
 
         if (__USE_RTC())
                 return;
-        tlen = current_tick_length(SHIFT_SCALE - 10);
+        tlen = current_tick_length();
         offset = cur_tb - do_gtod.varp->tb_orig_stamp;
         if (tlen == last_tick_len && offset < 0x80000000u)
                 return;