[PATCH] use const in time.h unit conversion functions

From: William Lee Irwin III <wli@holomorphy.com>

The time conversion functions may have const args, which is in fact useful
for when they are passed const variables as arguments so as to avoid
discarding qualifiers from pointer types warnings.  This is a preparatory
cleanup for a minor aio bugfix.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/time.h

@@ -184,7 +184,7 @@ struct timezone {
  * Avoid unnecessary multiplications/divisions in the
  * two most common HZ cases:
  */
-static inline unsigned int jiffies_to_msecs(unsigned long j)
+static inline unsigned int jiffies_to_msecs(const unsigned long j)
 {
 #if HZ <= 1000 && !(1000 % HZ)
 	return (1000 / HZ) * j;
@@ -194,7 +194,7 @@ static inline unsigned int jiffies_to_msecs(unsigned long j)
 	return (j * 1000) / HZ;
 #endif
 }
-static inline unsigned long msecs_to_jiffies(unsigned int m)
+static inline unsigned long msecs_to_jiffies(const unsigned int m)
 {
 #if HZ <= 1000 && !(1000 % HZ)
 	return (m + (1000 / HZ) - 1) / (1000 / HZ);
@@ -217,7 +217,7 @@ static inline unsigned long msecs_to_jiffies(unsigned int m)
  * value to a scaled second value.
  */
 static __inline__ unsigned long
-timespec_to_jiffies(struct timespec *value)
+timespec_to_jiffies(const struct timespec *value)
 {
 	unsigned long sec = value->tv_sec;
 	long nsec = value->tv_nsec + TICK_NSEC - 1;
@@ -233,7 +233,7 @@ timespec_to_jiffies(struct timespec *value)
 }
 
 static __inline__ void
-jiffies_to_timespec(unsigned long jiffies, struct timespec *value)
+jiffies_to_timespec(const unsigned long jiffies, struct timespec *value)
 {
 	/*
 	 * Convert jiffies to nanoseconds and separate with
@@ -256,7 +256,7 @@ jiffies_to_timespec(unsigned long jiffies, struct timespec *value)
  * instruction above the way it was done above.
  */
 static __inline__ unsigned long
-timeval_to_jiffies(struct timeval *value)
+timeval_to_jiffies(const struct timeval *value)
 {
 	unsigned long sec = value->tv_sec;
 	long usec = value->tv_usec;
@@ -271,7 +271,7 @@ timeval_to_jiffies(struct timeval *value)
 }
 
 static __inline__ void
-jiffies_to_timeval(unsigned long jiffies, struct timeval *value)
+jiffies_to_timeval(const unsigned long jiffies, struct timeval *value)
 {
 	/*
 	 * Convert jiffies to nanoseconds and separate with