commit ec03d7073971e20a866448d62c992a168201ac82
author Andrew Morton <akpm@linux-foundation.org> Wed Feb 06 01:38:06 2008 -0800
committer Linus Torvalds <torvalds@woody.linux-foundation.org> Wed Feb 06 10:41:10 2008 -0800
tree 16b1954017d97ff8a40ca4ee78fd8f837c710a14
parent 6ffc787a4492ac627315aaeafdfdc0a5c3028582

speed up jiffies conversion functions if HZ==USER_HZ

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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/time.c

diff --git a/kernel/time.c b/kernel/time.c
index be5c8cb..33af3e5 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -606,8 +606,10 @@
 # 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
 	/*