[PATCH] x86_64: Add useful constants to time.h

In timekeeping code, one often does need to use conversion constants. Naming
these leads to code that's easier to understand, showing the reader between
which units the conversion is made.
Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/time.h

@@ -29,9 +29,12 @@ struct timezone {
 
 /* Parameters used to convert the timespec values: */
 #define MSEC_PER_SEC	1000L
+#define USEC_PER_MSEC	1000L
+#define NSEC_PER_USEC	1000L
+#define NSEC_PER_MSEC	1000000L
 #define USEC_PER_SEC	1000000L
 #define NSEC_PER_SEC	1000000000L
-#define NSEC_PER_USEC		1000L
+#define FSEC_PER_SEC	1000000000000000L
 
 static inline int timespec_equal(struct timespec *a, struct timespec *b)
 {