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Date: Sat, 12 Feb 2011 00:28:34 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Linux PM mailing list <linux-pm@...ts.linux-foundation.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Len Brown <lenb@...nel.org>,
ACPI Devel Mailing List <linux-acpi@...r.kernel.org>,
Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] PM: Drop pm_flags that is not necessary
From: Rafael J. Wysocki <rjw@...k.pl>
The variable pm_flags is used to prevent APM from being enabled
along with ACPI, which would lead to problems. However, acpi_init()
is always called before apm_init() and after acpi_init() has
returned, it is known whether or not ACPI will be used. Namely, if
acpi_disabled is not set after acpi_init() has returned, this means
that ACPI is enabled. Thus, it is sufficient to check acpi_disabled
in apm_init() to prevent APM from being enabled in parallel with
ACPI.
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
Hi,
This patch is on top of suspend-2.6/linux-next .
Thanks,
Rafael
---
arch/x86/kernel/apm_32.c | 5 ++---
drivers/acpi/bus.c | 22 +++++-----------------
include/linux/pm.h | 9 ---------
include/linux/suspend.h | 6 ------
kernel/power/main.c | 13 -------------
5 files changed, 7 insertions(+), 48 deletions(-)
Index: linux-2.6/arch/x86/kernel/apm_32.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apm_32.c
+++ linux-2.6/arch/x86/kernel/apm_32.c
@@ -227,6 +227,7 @@
#include <linux/suspend.h>
#include <linux/kthread.h>
#include <linux/jiffies.h>
+#include <linux/acpi.h>
#include <asm/system.h>
#include <asm/uaccess.h>
@@ -2331,12 +2332,11 @@ static int __init apm_init(void)
apm_info.disabled = 1;
return -ENODEV;
}
- if (pm_flags & PM_ACPI) {
+ if (!acpi_disabled) {
printk(KERN_NOTICE "apm: overridden by ACPI.\n");
apm_info.disabled = 1;
return -ENODEV;
}
- pm_flags |= PM_APM;
/*
* Set up the long jump entry point to the APM BIOS, which is called
@@ -2428,7 +2428,6 @@ static void __exit apm_exit(void)
kthread_stop(kapmd_task);
kapmd_task = NULL;
}
- pm_flags &= ~PM_APM;
}
module_init(apm_init);
Index: linux-2.6/include/linux/pm.h
===================================================================
--- linux-2.6.orig/include/linux/pm.h
+++ linux-2.6/include/linux/pm.h
@@ -563,15 +563,6 @@ enum dpm_order {
DPM_ORDER_DEV_LAST,
};
-/*
- * Global Power Management flags
- * Used to keep APM and ACPI from both being active
- */
-extern unsigned int pm_flags;
-
-#define PM_APM 1
-#define PM_ACPI 2
-
extern int pm_generic_suspend(struct device *dev);
extern int pm_generic_resume(struct device *dev);
extern int pm_generic_freeze(struct device *dev);
Index: linux-2.6/include/linux/suspend.h
===================================================================
--- linux-2.6.orig/include/linux/suspend.h
+++ linux-2.6/include/linux/suspend.h
@@ -272,9 +272,6 @@ extern int unregister_pm_notifier(struct
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;
@@ -295,9 +292,6 @@ static inline int unregister_pm_notifier
#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 */
Index: linux-2.6/kernel/power/main.c
===================================================================
--- linux-2.6.orig/kernel/power/main.c
+++ linux-2.6/kernel/power/main.c
@@ -19,19 +19,6 @@ DEFINE_MUTEX(pm_mutex);
#ifdef CONFIG_PM_SLEEP
-unsigned int pm_flags;
-EXPORT_SYMBOL(pm_flags);
-
-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 */
static BLOCKING_NOTIFIER_HEAD(pm_chain_head);
Index: linux-2.6/drivers/acpi/bus.c
===================================================================
--- linux-2.6.orig/drivers/acpi/bus.c
+++ linux-2.6/drivers/acpi/bus.c
@@ -1007,8 +1007,7 @@ struct kobject *acpi_kobj;
static int __init acpi_init(void)
{
- int result = 0;
-
+ int result;
if (acpi_disabled) {
printk(KERN_INFO PREFIX "Interpreter disabled.\n");
@@ -1023,29 +1022,18 @@ static int __init acpi_init(void)
init_acpi_device_notify();
result = acpi_bus_init();
-
- if (!result) {
- pci_mmcfg_late_init();
- if (pm_apm_enabled()) {
- printk(KERN_INFO PREFIX
- "APM is already active, exiting\n");
- disable_acpi();
- result = -ENODEV;
- } else {
- pm_set_acpi_flag();
- }
- } else
+ if (result) {
disable_acpi();
-
- if (acpi_disabled)
return result;
+ }
+ pci_mmcfg_late_init();
acpi_scan_init();
acpi_ec_init();
acpi_debugfs_init();
acpi_sleep_proc_init();
acpi_wakeup_device_init();
- return result;
+ return 0;
}
subsys_initcall(acpi_init);
--
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