[PATCH] Fix msleep to sleep _at_least_ the requested amount

Makes sure msleep() sleeps at least the amount provided, since
schedule_timeout() doesn't guarantee a full jiffy.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

kernel/timer.c

@@ -1605,7 +1605,7 @@ unregister_time_interpolator(struct time_interpolator *ti)
  */
 void msleep(unsigned int msecs)
 {
-	unsigned long timeout = msecs_to_jiffies(msecs);
+	unsigned long timeout = msecs_to_jiffies(msecs) + 1;
 
 	while (timeout) {
 		set_current_state(TASK_UNINTERRUPTIBLE);
@@ -1621,7 +1621,7 @@ EXPORT_SYMBOL(msleep);
  */
 unsigned long msleep_interruptible(unsigned int msecs)
 {
-	unsigned long timeout = msecs_to_jiffies(msecs);
+	unsigned long timeout = msecs_to_jiffies(msecs) + 1;
 
 	while (timeout && !signal_pending(current)) {
 		set_current_state(TASK_INTERRUPTIBLE);