parisc: Switch do_timer() to xtime_update()

xtime_update() takes the xtime_lock itself.
Signed-off-by: Torben Hohn <torbenh@gmx.de>
Cc: hch@infradead.org
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: johnstul@us.ibm.com
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: yong.zhang0@gmail.com
LKML-Reference: <20110127150017.23248.22559.stgit@localhost>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/parisc/kernel/time.c

@@ -162,11 +162,8 @@ irqreturn_t __irq_entry timer_interrupt(int irq, void *dev_id)
 		update_process_times(user_mode(get_irq_regs()));
 	}
 
-	if (cpu == 0) {
-		write_seqlock(&xtime_lock);
-		do_timer(ticks_elapsed);
-		write_sequnlock(&xtime_lock);
-	}
+	if (cpu == 0)
+		xtime_update(ticks_elapsed);
 
 	return IRQ_HANDLED;
 }