PM / ACPI: Remove references to pm_flags from bus.c

If direct references to pm_flags are removed from drivers/acpi/bus.c,
CONFIG_ACPI will not need to depend on CONFIG_PM any more.  Make that
happen.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Len Brown <len.brown@intel.com>

4 files changed, 21 insertions, 5 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 2aa042a5da6d..3a17ca5fff6f 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -7,7 +7,6 @@ menuconfig ACPI
         depends on !IA64_HP_SIM
         depends on IA64 || X86
         depends on PCI
-        depends on PM
         select PNP
         default y
         help
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 7ced61f39492..973b0709972c 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -40,6 +40,7 @@
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
 #include <linux/dmi.h>
+#include <linux/suspend.h>
 
 #include "internal.h"
 
@@ -1025,13 +1026,13 @@ static int __init acpi_init(void)
 
         if (!result) {
                 pci_mmcfg_late_init();
-                if (!(pm_flags & PM_APM))
-                        pm_flags |= PM_ACPI;
-                else {
+                if (pm_apm_enabled()) {
                         printk(KERN_INFO PREFIX
                                "APM is already active, exiting\n");
                         disable_acpi();
                         result = -ENODEV;
+                } else {
+                        pm_set_acpi_flag();
                 }
         } else
                 disable_acpi();
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 5a89e3612875..5e364db8a56a 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -272,6 +272,9 @@ extern int unregister_pm_notifier(struct notifier_block *nb);
         register_pm_notifier(&fn##_nb);                 \
 }
 
+extern bool pm_apm_enabled(void);
+extern void pm_set_acpi_flag(void);
+
 /* drivers/base/power/wakeup.c */
 extern bool events_check_enabled;
 
@@ -292,6 +295,9 @@ static inline int unregister_pm_notifier(struct notifier_block *nb)
 
 #define pm_notifier(fn, pri)    do { (void)(fn); } while (0)
 
+static inline bool pm_apm_enabled(void) { return false; }
+static inline void pm_set_acpi_flag(void) {}
+
 static inline bool pm_wakeup_pending(void) { return false; }
 #endif /* !CONFIG_PM_SLEEP */
 
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 701853042c28..b5405af48ddb 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -17,10 +17,20 @@
 
 DEFINE_MUTEX(pm_mutex);
 
+#ifdef CONFIG_PM_SLEEP
+
 unsigned int pm_flags;
 EXPORT_SYMBOL(pm_flags);
 
-#ifdef CONFIG_PM_SLEEP
+bool pm_apm_enabled(void)
+{
+        return !!(pm_flags & PM_APM);
+}
+
+void pm_set_acpi_flag(void)
+{
+        pm_flags |= PM_ACPI;
+}
 
 /* Routines for PM-transition notifications */