From: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

Add missing compensation for (HZ == 250) != (1 << SHIFT_HZ) in
second_overflow().

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 kernel/timer.c |    9 +++++++++
 1 files changed, 9 insertions(+)

diff -puN kernel/timer.c~timers-add-missing-compensation-for-hz-==-250 kernel/timer.c
--- devel/kernel/timer.c~timers-add-missing-compensation-for-hz-==-250	2005-10-16 20:28:19.000000000 -0700
+++ devel-akpm/kernel/timer.c	2005-10-16 20:28:19.000000000 -0700
@@ -752,6 +752,15 @@ static void second_overflow(void)
     else
 	time_adj += (time_adj >> 2) + (time_adj >> 5);
 #endif
+#if HZ == 250
+    /* Compensate for (HZ==250) != (1 << SHIFT_HZ).
+     * Add 1.5625% and 0.78125% to get 255.85938; => only 0.05% error (p. 14)
+     */
+    if (time_adj < 0)
+	time_adj -= (-time_adj >> 6) + (-time_adj >> 7);
+    else
+	time_adj += (time_adj >> 6) + (time_adj >> 7);
+#endif
 #if HZ == 1000
     /* Compensate for (HZ==1000) != (1 << SHIFT_HZ).
      * Add 1.5625% and 0.78125% to get 1023.4375; => only 0.05% error (p. 14)
_