timekeeping: Another fix to the VSYSCALL_OLD update_vsyscall

Benjamin Herrenschmidt pointed out that I further missed modifying
update_vsyscall after the wall_to_mono value was changed to a
timespec64.  This causes issues on powerpc32, which expects a 32bit
timespec.

This patch fixes the problem by properly converting from a timespec64 to
a timespec before passing the value on to the arch-specific vsyscall
logic.

[ Thomas is currently on vacation, but reviewed it and wanted me to send
  this fix on to you directly. ]

Cc: LKML <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Reported-by: Benjamin Herrenschmidt <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]>
Signed-off-by: John Stultz <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

kernel/time/timekeeping.c

@@ -338,10 +338,11 @@ EXPORT_SYMBOL_GPL(ktime_get_mono_fast_ns);
 
 static inline void update_vsyscall(struct timekeeper *tk)
 {
-	struct timespec xt;
+	struct timespec xt, wm;
 
 	xt = timespec64_to_timespec(tk_xtime(tk));
-	update_vsyscall_old(&xt, &tk->wall_to_monotonic, tk->tkr.clock, tk->tkr.mult,
+	wm = timespec64_to_timespec(tk->wall_to_monotonic);
+	update_vsyscall_old(&xt, &wm, tk->tkr.clock, tk->tkr.mult,
 			    tk->tkr.cycle_last);
 }