sh: Provide cpu_idle_wait() to fix up cpuidle/SMP build.

Crib the x86 cpu_idle_wait() implementation and shove it in with the
idle code, subsequently enabling ARCH_HAS_CPU_IDLE_WAIT.

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

3 files changed, 26 insertions, 1 deletions

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index ac1c620..09c0aef 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -151,6 +151,9 @@ config ARCH_NO_VIRT_TO_BUS
 config ARCH_HAS_DEFAULT_IDLE
 	def_bool y
 
+config ARCH_HAS_CPU_IDLE_WAIT
+	def_bool y
+
 config IO_TRAPPED
 	bool
 
diff --git a/arch/sh/include/asm/system.h b/arch/sh/include/asm/system.h
index a88895e..ab79e1f 100644
--- a/arch/sh/include/asm/system.h
+++ b/arch/sh/include/asm/system.h
@@ -154,6 +154,7 @@ extern struct dentry *sh_debugfs_root;
 
 void per_cpu_trap_init(void);
 void default_idle(void);
+void cpu_idle_wait(void);
 
 asmlinkage void break_point_trap(void);
 
diff --git a/arch/sh/kernel/idle.c b/arch/sh/kernel/idle.c
index f35ed03..27ff2dc 100644
--- a/arch/sh/kernel/idle.c
+++ b/arch/sh/kernel/idle.c
@@ -1,7 +1,7 @@
 /*
  * The idle loop for all SuperH platforms.
  *
- *  Copyright (C) 2002 - 2008  Paul Mundt
+ *  Copyright (C) 2002 - 2009  Paul Mundt
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
@@ -15,6 +15,7 @@
 #include <linux/preempt.h>
 #include <linux/thread_info.h>
 #include <linux/irqflags.h>
+#include <linux/smp.h>
 #include <asm/pgalloc.h>
 #include <asm/system.h>
 #include <asm/atomic.h>
@@ -79,3 +80,23 @@ void cpu_idle(void)
 		check_pgt_cache();
 	}
 }
+
+static void do_nothing(void *unused)
+{
+}
+
+/*
+ * cpu_idle_wait - Used to ensure that all the CPUs discard old value of
+ * pm_idle and update to new pm_idle value. Required while changing pm_idle
+ * handler on SMP systems.
+ *
+ * Caller must have changed pm_idle to the new value before the call. Old
+ * pm_idle value will not be used by any CPU after the return of this function.
+ */
+void cpu_idle_wait(void)
+{
+	smp_mb();
+	/* kick all the CPUs so that they exit out of pm_idle */
+	smp_call_function(do_nothing, NULL, 1);
+}
+EXPORT_SYMBOL_GPL(cpu_idle_wait);