[PATCH] acpi: fix unused function warning

[KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>]

Len, Is this known issue?


=========================================================
When CONFIG_ACPI_PROCFS=n, processor_idle.c makes following warning.

	drivers/acpi/processor_idle.c:83: warning: 'us_to_pm_timer_ticks'
	defined but not used.

This patch fixes it.

Cc: Venkatesh Pallipadi <venki@google.com>
Cc: Len Brown <len.brown@intel.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
---
 drivers/acpi/processor_idle.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 0e562d0..3c36769 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -80,10 +80,13 @@ module_param(nocst, uint, 0000);
 static unsigned int latency_factor __read_mostly = 2;
 module_param(latency_factor, uint, 0644);
 
+#ifdef CONFIG_ACPI_PROCFS
 static u64 us_to_pm_timer_ticks(s64 t)
 {
 	return div64_u64(t * PM_TIMER_FREQUENCY, 1000000);
 }
+#endif
+
 /*
  * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3.
  * For now disable this. Probably a bug somewhere else.
-- 
1.6.5.2