From: Thomas Gleixner <tglx@linutronix.de>

apic.h does not get included on UP compiles.  That way the
APICTIMER_STOPS_ON_C3 is not there and UP boxen have no support for
timer broadcasting.  This was never noticed, because the lapic timer is
only used for profiling on UP.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: john stultz <johnstul@us.ibm.com>
Cc: "Brown, Len" <len.brown@intel.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 drivers/acpi/processor_idle.c |   10 ++++++++++
 1 files changed, 10 insertions(+)

diff -puN drivers/acpi/processor_idle.c~acpi-include-fix drivers/acpi/processor_idle.c
--- a/drivers/acpi/processor_idle.c~acpi-include-fix
+++ a/drivers/acpi/processor_idle.c
@@ -40,6 +40,16 @@
 #include <linux/sched.h>	/* need_resched() */
 #include <linux/latency.h>
 
+/*
+ * Include the apic definitions for x86 to have the APIC timer related defines
+ * available also for UP (on SMP it gets magically included via linux/smp.h).
+ * asm/acpi.h is not an option, as it would require more include magic. Also
+ * creating an empty asm-ia64/apic.h would just trade pest vs. cholera.
+ */
+#ifdef CONFIG_X86
+#include <asm/apic.h>
+#endif
+
 #include <asm/io.h>
 #include <asm/uaccess.h>
 
_