[PATCH] xtime value may become incorrect

The xtime value may become incorrect when the update_wall_time(ticks)
function is called with "ticks" > 1.  In such a case, the xtime variable is
updated multiple times inside the loop but it is normalized only once
outside of the loop.

This bug was reported at:

http://bugme.osdl.org/show_bug.cgi?id=3403Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

kernel/timer.c

@@ -790,13 +790,12 @@ static void update_wall_time(unsigned long ticks)
 	do {
 		ticks--;
 		update_wall_time_one_tick();
+		if (xtime.tv_nsec >= 1000000000) {
+			xtime.tv_nsec -= 1000000000;
+			xtime.tv_sec++;
+			second_overflow();
+		}
 	} while (ticks);
-
-	if (xtime.tv_nsec >= 1000000000) {
-	    xtime.tv_nsec -= 1000000000;
-	    xtime.tv_sec++;
-	    second_overflow();
-	}
 }
 
 static inline void do_process_times(struct task_struct *p,