[ARM] Fix SMP irqflags support

The IRQ changes a while back broke the build for SMP machines.
Fix up the SMP code to use set_irq_regs/get_irq_regs as
appropriate.  Also, fix a warning in arch/arm/kernel/time.c
where 'regs' becomes unused for SMP builds.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index c03cab5..0c5a609 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -327,13 +327,12 @@
  */
 void timer_tick(void)
 {
-	struct pt_regs *regs = get_irq_regs();
 	profile_tick(CPU_PROFILING);
 	do_leds();
 	do_set_rtc();
 	do_timer(1);
 #ifndef CONFIG_SMP
-	update_process_times(user_mode(regs));
+	update_process_times(user_mode(get_irq_regs()));
 #endif
 }