From: Andrew Morton <akpm@linux-foundation.org>

Avoid calling do_div(x, 1) in this case.

Cc: David Fries <david@fries.net>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/time.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff -puN kernel/time.c~speed-up-jiffies-conversion-functions-if-hz==user_hz kernel/time.c
--- a/kernel/time.c~speed-up-jiffies-conversion-functions-if-hz==user_hz
+++ a/kernel/time.c
@@ -605,8 +605,10 @@ u64 jiffies_64_to_clock_t(u64 x)
 # if HZ < USER_HZ
 	x *= USER_HZ;
 	do_div(x, HZ);
-# else
+# elif HZ > USER_HZ
 	do_div(x, HZ / USER_HZ);
+# else
+	/* Nothing to do */
 # endif
 #else
 	/*
_