zlc_setup(): handle jiffies wraparound

jiffies subtraction may cause an overflow problem.  It should be using
time_after().

[[email protected]: include jiffies.h]
Signed-off-by: KOSAKI Motohiro <[email protected]>
Cc: Lee Schermerhorn <[email protected]>
Cc: Paul Jackson <[email protected]>
Cc: Mel Gorman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
1 file changed