From: Thomas Gleixner <tglx@linutronix.de>

Migration aid to allow preparatory patches which introduce not yet used parts
of clock events code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Andi Kleen <ak@suse.de>
Cc: john stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/clockchips.h |    8 ++++++--
 kernel/time/Kconfig        |    5 +++++
 kernel/time/Makefile       |    2 +-
 kernel/time/clockevents.c  |    3 ++-
 4 files changed, 14 insertions(+), 4 deletions(-)

diff -puN include/linux/clockchips.h~clockevents-allow-build-without-runtime-use include/linux/clockchips.h
--- a/include/linux/clockchips.h~clockevents-allow-build-without-runtime-use
+++ a/include/linux/clockchips.h
@@ -8,7 +8,7 @@
 #ifndef _LINUX_CLOCKCHIPS_H
 #define _LINUX_CLOCKCHIPS_H
 
-#ifdef CONFIG_GENERIC_CLOCKEVENTS
+#ifdef CONFIG_GENERIC_CLOCKEVENTS_BUILD
 
 #include <linux/clocksource.h>
 #include <linux/cpumask.h>
@@ -126,9 +126,13 @@ extern int clockevents_register_notifier
 extern int clockevents_program_event(struct clock_event_device *dev,
 				     ktime_t expires, ktime_t now);
 
+#ifdef CONFIG_GENERIC_CLOCKEVENTS
 extern void clockevents_notify(unsigned long reason, void *arg);
-
 #else
+# define clockevents_notify(reason, arg) do { } while (0)
+#endif
+
+#else /* CONFIG_GENERIC_CLOCKEVENTS_BUILD */
 
 #define clockevents_notify(reason, arg) do { } while (0)
 
diff -puN kernel/time/Kconfig~clockevents-allow-build-without-runtime-use kernel/time/Kconfig
--- a/kernel/time/Kconfig~clockevents-allow-build-without-runtime-use
+++ a/kernel/time/Kconfig
@@ -23,3 +23,8 @@ config HIGH_RES_TIMERS
 	  hardware is not capable then this option only increases
 	  the size of the kernel image.
 
+config GENERIC_CLOCKEVENTS_BUILD
+	bool
+	default y
+	depends on GENERIC_CLOCKEVENTS || GENERIC_CLOCKEVENTS_MIGR
+
diff -puN kernel/time/Makefile~clockevents-allow-build-without-runtime-use kernel/time/Makefile
--- a/kernel/time/Makefile~clockevents-allow-build-without-runtime-use
+++ a/kernel/time/Makefile
@@ -1,6 +1,6 @@
 obj-y += timekeeping.o ntp.o clocksource.o jiffies.o timer_list.o
 
-obj-$(CONFIG_GENERIC_CLOCKEVENTS)		+= clockevents.o
+obj-$(CONFIG_GENERIC_CLOCKEVENTS_BUILD)		+= clockevents.o
 obj-$(CONFIG_GENERIC_CLOCKEVENTS)		+= tick-common.o
 obj-$(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST)	+= tick-broadcast.o
 obj-$(CONFIG_TICK_ONESHOT)			+= tick-oneshot.o
diff -puN kernel/time/clockevents.c~clockevents-allow-build-without-runtime-use kernel/time/clockevents.c
--- a/kernel/time/clockevents.c~clockevents-allow-build-without-runtime-use
+++ a/kernel/time/clockevents.c
@@ -194,6 +194,7 @@ void clockevents_exchange_device(struct 
 	local_irq_restore(flags);
 }
 
+#ifdef CONFIG_GENERIC_CLOCKEVENTS
 /**
  * clockevents_notify - notification about relevant events
  */
@@ -222,4 +223,4 @@ void clockevents_notify(unsigned long re
 	spin_unlock(&clockevents_lock);
 }
 EXPORT_SYMBOL_GPL(clockevents_notify);
-
+#endif
_