Clarify the human-time units to jiffies conversion functions by using the
constants in time.h.  This makes many of the subsequent patches direct
copies of the current code.
Signed-off-by: NNishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>