sh: CPU hotplug support.

This adds preliminary support for CPU hotplug for SH SMP systems.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/sh/kernel/idle.c b/arch/sh/kernel/idle.c
index 204005329fe..425d604e3a2 100644
--- a/arch/sh/kernel/idle.c
+++ b/arch/sh/kernel/idle.c
@@ -19,6 +19,7 @@
 #include <asm/pgalloc.h>
 #include <asm/system.h>
 #include <asm/atomic.h>
+#include <asm/smp.h>
 
 void (*pm_idle)(void) = NULL;
 
@@ -89,10 +90,13 @@ void cpu_idle(void)
         while (1) {
                 tick_nohz_stop_sched_tick(1);
 
-                while (!need_resched() && cpu_online(cpu)) {
+                while (!need_resched()) {
                         check_pgt_cache();
                         rmb();
 
+                        if (cpu_is_offline(cpu))
+                                play_dead();
+
                         local_irq_disable();
                         /* Don't trace irqs off for idle */
                         stop_critical_timings();