From 296699de6bdc717189a331ab6bbe90e05c94db06 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sun, 29 Jul 2007 23:27:18 +0200 Subject: [PATCH] Introduce CONFIG_SUSPEND for suspend-to-Ram and standby Introduce CONFIG_SUSPEND representing the ability to enter system sleep states, such as the ACPI S3 state, and allow the user to choose SUSPEND and HIBERNATION independently of each other. Make HOTPLUG_CPU be selected automatically if SUSPEND or HIBERNATION has been chosen and the kernel is intended for SMP systems. Also, introduce CONFIG_PM_SLEEP which is automatically selected if CONFIG_SUSPEND or CONFIG_HIBERNATION is set and use it to select the code needed for both suspend and hibernation. The top-level power management headers and the ACPI code related to suspend and hibernation are modified to use the new definitions (the changes in drivers/acpi/sleep/main.c are, mostly, moving code to reduce the number of ifdefs). There are many other files in which CONFIG_PM can be replaced with CONFIG_PM_SLEEP or even with CONFIG_SUSPEND, but they can be updated in the future. Signed-off-by: Rafael J. Wysocki Signed-off-by: Linus Torvalds --- drivers/acpi/Kconfig | 8 ++++ drivers/acpi/sleep/Makefile | 2 +- drivers/acpi/sleep/main.c | 94 ++++++++++++++++++++----------------- drivers/acpi/sleep/proc.c | 10 ++-- drivers/acpi/sleep/sleep.h | 2 + drivers/base/power/Makefile | 2 +- drivers/base/power/power.h | 4 +- include/acpi/acpi_bus.h | 9 ++++ include/acpi/acpi_drivers.h | 4 ++ include/linux/freezer.h | 6 +-- include/linux/pm.h | 15 ++++-- include/linux/suspend.h | 10 ++-- kernel/power/Kconfig | 41 ++++++++++++---- kernel/power/Makefile | 3 +- kernel/power/main.c | 26 ++++++---- kernel/power/power.h | 10 +++- mm/page_alloc.c | 4 +- 17 files changed, 164 insertions(+), 86 deletions(-) diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index 22b401b2e088..66e78d52a093 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -63,6 +63,14 @@ config ACPI_PROCFS Say N to delete /proc/acpi/ files that have moved to /sys/ +config ACPI_PROCFS_SLEEP + bool "/proc/acpi/sleep (deprecated)" + depends on PM_SLEEP && ACPI_PROCFS + default n + ---help--- + Create /proc/acpi/sleep + Deprecated by /sys/power/state + config ACPI_AC tristate "AC Adapter" depends on X86 diff --git a/drivers/acpi/sleep/Makefile b/drivers/acpi/sleep/Makefile index 01a993a1d086..2bec897ab1eb 100644 --- a/drivers/acpi/sleep/Makefile +++ b/drivers/acpi/sleep/Makefile @@ -1,5 +1,5 @@ obj-y := poweroff.o wakeup.o -obj-y += main.o +obj-$(CONFIG_PM_SLEEP) += main.o obj-$(CONFIG_X86) += proc.o EXTRA_CFLAGS += $(ACPI_CFLAGS) diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c index b4e94c893c81..e8cff5dd4cbc 100644 --- a/drivers/acpi/sleep/main.c +++ b/drivers/acpi/sleep/main.c @@ -21,6 +21,9 @@ u8 sleep_states[ACPI_S_STATE_COUNT]; +static u32 acpi_target_sleep_state = ACPI_STATE_S0; + +#ifdef CONFIG_SUSPEND static struct pm_ops acpi_pm_ops; extern void do_suspend_lowlevel(void); @@ -34,11 +37,6 @@ static u32 acpi_suspend_states[] = { static int init_8259A_after_S1; -extern int acpi_sleep_prepare(u32 acpi_state); -extern void acpi_power_off(void); - -static u32 acpi_target_sleep_state = ACPI_STATE_S0; - /** * acpi_pm_set_target - Set the target system sleep state to the state * associated with given @pm_state, if supported. @@ -163,21 +161,6 @@ static int acpi_pm_finish(suspend_state_t pm_state) return 0; } -int acpi_suspend(u32 acpi_state) -{ - suspend_state_t states[] = { - [1] = PM_SUSPEND_STANDBY, - [3] = PM_SUSPEND_MEM, - [5] = PM_SUSPEND_MAX - }; - - if (acpi_state < 6 && states[acpi_state]) - return pm_suspend(states[acpi_state]); - if (acpi_state == 4) - return hibernate(); - return -EINVAL; -} - static int acpi_pm_state_valid(suspend_state_t pm_state) { u32 acpi_state; @@ -202,6 +185,27 @@ static struct pm_ops acpi_pm_ops = { .finish = acpi_pm_finish, }; +/* + * Toshiba fails to preserve interrupts over S1, reinitialization + * of 8259 is needed after S1 resume. + */ +static int __init init_ints_after_s1(struct dmi_system_id *d) +{ + printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident); + init_8259A_after_S1 = 1; + return 0; +} + +static struct dmi_system_id __initdata acpisleep_dmi_table[] = { + { + .callback = init_ints_after_s1, + .ident = "Toshiba Satellite 4030cdt", + .matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),}, + }, + {}, +}; +#endif /* CONFIG_SUSPEND */ + #ifdef CONFIG_HIBERNATION static int acpi_hibernation_prepare(void) { @@ -256,6 +260,21 @@ static struct hibernation_ops acpi_hibernation_ops = { }; #endif /* CONFIG_HIBERNATION */ +int acpi_suspend(u32 acpi_state) +{ + suspend_state_t states[] = { + [1] = PM_SUSPEND_STANDBY, + [3] = PM_SUSPEND_MEM, + [5] = PM_SUSPEND_MAX + }; + + if (acpi_state < 6 && states[acpi_state]) + return pm_suspend(states[acpi_state]); + if (acpi_state == 4) + return hibernate(); + return -EINVAL; +} + /** * acpi_pm_device_sleep_state - return preferred power state of ACPI device * in the system sleep state given by %acpi_target_sleep_state @@ -331,39 +350,22 @@ int acpi_pm_device_sleep_state(struct device *dev, int wake, int *d_min_p) return d_max; } -/* - * Toshiba fails to preserve interrupts over S1, reinitialization - * of 8259 is needed after S1 resume. - */ -static int __init init_ints_after_s1(struct dmi_system_id *d) -{ - printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident); - init_8259A_after_S1 = 1; - return 0; -} - -static struct dmi_system_id __initdata acpisleep_dmi_table[] = { - { - .callback = init_ints_after_s1, - .ident = "Toshiba Satellite 4030cdt", - .matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),}, - }, - {}, -}; - int __init acpi_sleep_init(void) { + acpi_status status; + u8 type_a, type_b; +#ifdef CONFIG_SUSPEND int i = 0; dmi_check_system(acpisleep_dmi_table); +#endif if (acpi_disabled) return 0; +#ifdef CONFIG_SUSPEND printk(KERN_INFO PREFIX "(supports"); - for (i = 0; i < ACPI_S_STATE_COUNT; i++) { - acpi_status status; - u8 type_a, type_b; + for (i = ACPI_STATE_S0; i < ACPI_STATE_S4; i++) { status = acpi_get_sleep_type_data(i, &type_a, &type_b); if (ACPI_SUCCESS(status)) { sleep_states[i] = 1; @@ -373,10 +375,14 @@ int __init acpi_sleep_init(void) printk(")\n"); pm_set_ops(&acpi_pm_ops); +#endif #ifdef CONFIG_HIBERNATION - if (sleep_states[ACPI_STATE_S4]) + status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b); + if (ACPI_SUCCESS(status)) { hibernation_set_ops(&acpi_hibernation_ops); + sleep_states[ACPI_STATE_S4] = 1; + } #else sleep_states[ACPI_STATE_S4] = 0; #endif diff --git a/drivers/acpi/sleep/proc.c b/drivers/acpi/sleep/proc.c index 1b7bbb5ba623..5dfe8b789633 100644 --- a/drivers/acpi/sleep/proc.c +++ b/drivers/acpi/sleep/proc.c @@ -23,7 +23,7 @@ */ ACPI_MODULE_NAME("sleep") -#ifdef CONFIG_ACPI_PROCFS +#ifdef CONFIG_ACPI_PROCFS_SLEEP static int acpi_system_sleep_seq_show(struct seq_file *seq, void *offset) { int i; @@ -76,7 +76,7 @@ acpi_system_write_sleep(struct file *file, Done: return error ? error : count; } -#endif /* CONFIG_ACPI_PROCFS */ +#endif /* CONFIG_ACPI_PROCFS_SLEEP */ #if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE) /* use /sys/class/rtc/rtcX/wakealarm instead; it's not ACPI-specific */ @@ -471,7 +471,7 @@ static const struct file_operations acpi_system_wakeup_device_fops = { .release = single_release, }; -#ifdef CONFIG_ACPI_PROCFS +#ifdef CONFIG_ACPI_PROCFS_SLEEP static const struct file_operations acpi_system_sleep_fops = { .open = acpi_system_sleep_open_fs, .read = seq_read, @@ -479,7 +479,7 @@ static const struct file_operations acpi_system_sleep_fops = { .llseek = seq_lseek, .release = single_release, }; -#endif /* CONFIG_ACPI_PROCFS */ +#endif /* CONFIG_ACPI_PROCFS_SLEEP */ #ifdef HAVE_ACPI_LEGACY_ALARM static const struct file_operations acpi_system_alarm_fops = { @@ -506,7 +506,7 @@ static int __init acpi_sleep_proc_init(void) if (acpi_disabled) return 0; -#ifdef CONFIG_ACPI_PROCFS +#ifdef CONFIG_ACPI_PROCFS_SLEEP /* 'sleep' [R/W] */ entry = create_proc_entry("sleep", S_IFREG | S_IRUGO | S_IWUSR, diff --git a/drivers/acpi/sleep/sleep.h b/drivers/acpi/sleep/sleep.h index f3e70397a7d6..ff1f8504f497 100644 --- a/drivers/acpi/sleep/sleep.h +++ b/drivers/acpi/sleep/sleep.h @@ -6,3 +6,5 @@ extern void acpi_enable_wakeup_device_prep(u8 sleep_state); extern void acpi_enable_wakeup_device(u8 sleep_state); extern void acpi_disable_wakeup_device(u8 sleep_state); extern void acpi_gpe_sleep_prepare(u32 sleep_state); + +extern int acpi_sleep_prepare(u32 acpi_state); diff --git a/drivers/base/power/Makefile b/drivers/base/power/Makefile index 966a5e287415..9caeaea753a3 100644 --- a/drivers/base/power/Makefile +++ b/drivers/base/power/Makefile @@ -1,5 +1,5 @@ obj-y := shutdown.o -obj-$(CONFIG_PM) += main.o suspend.o resume.o sysfs.o +obj-$(CONFIG_PM_SLEEP) += main.o suspend.o resume.o sysfs.o obj-$(CONFIG_PM_TRACE) += trace.o ifeq ($(CONFIG_DEBUG_DRIVER),y) diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h index 591a0dd5deee..8ba0830cbc03 100644 --- a/drivers/base/power/power.h +++ b/drivers/base/power/power.h @@ -5,7 +5,7 @@ extern void device_shutdown(void); -#ifdef CONFIG_PM +#ifdef CONFIG_PM_SLEEP /* * main.c @@ -62,7 +62,7 @@ extern int resume_device(struct device *); */ extern int suspend_device(struct device *, pm_message_t); -#else /* CONFIG_PM */ +#else /* CONFIG_PM_SLEEP */ static inline int device_pm_add(struct device * dev) diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index 533ef40f7ccf..3d0fea235bf3 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -366,7 +366,16 @@ acpi_handle acpi_get_child(acpi_handle, acpi_integer); acpi_handle acpi_get_pci_rootbridge_handle(unsigned int, unsigned int); #define DEVICE_ACPI_HANDLE(dev) ((acpi_handle)((dev)->archdata.acpi_handle)) +#ifdef CONFIG_PM_SLEEP int acpi_pm_device_sleep_state(struct device *, int, int *); +#else /* !CONFIG_PM_SLEEP */ +static inline int acpi_pm_device_sleep_state(struct device *d, int w, int *p) +{ + if (p) + *p = ACPI_STATE_D0; + return ACPI_STATE_D3; +} +#endif /* !CONFIG_PM_SLEEP */ #endif /* CONFIG_ACPI */ diff --git a/include/acpi/acpi_drivers.h b/include/acpi/acpi_drivers.h index f85f77a538aa..777d37ae81a2 100644 --- a/include/acpi/acpi_drivers.h +++ b/include/acpi/acpi_drivers.h @@ -147,6 +147,10 @@ static inline void unregister_hotplug_dock_device(acpi_handle handle) /*-------------------------------------------------------------------------- Suspend/Resume -------------------------------------------------------------------------- */ +#ifdef CONFIG_PM_SLEEP extern int acpi_sleep_init(void); +#else +static inline int acpi_sleep_init(void) { return 0; } +#endif #endif /*__ACPI_DRIVERS_H__*/ diff --git a/include/linux/freezer.h b/include/linux/freezer.h index c8e02de737f6..efded00ad08c 100644 --- a/include/linux/freezer.h +++ b/include/linux/freezer.h @@ -5,7 +5,7 @@ #include -#ifdef CONFIG_PM +#ifdef CONFIG_PM_SLEEP /* * Check if a process has been frozen */ @@ -126,7 +126,7 @@ static inline void set_freezable(void) current->flags &= ~PF_NOFREEZE; } -#else +#else /* !CONFIG_PM_SLEEP */ static inline int frozen(struct task_struct *p) { return 0; } static inline int freezing(struct task_struct *p) { return 0; } static inline void set_freeze_flag(struct task_struct *p) {} @@ -143,6 +143,6 @@ static inline void freezer_do_not_count(void) {} static inline void freezer_count(void) {} static inline int freezer_should_skip(struct task_struct *p) { return 0; } static inline void set_freezable(void) {} -#endif +#endif /* !CONFIG_PM_SLEEP */ #endif /* FREEZER_H_INCLUDED */ diff --git a/include/linux/pm.h b/include/linux/pm.h index ad3cc2eb0d34..e52f6f83c061 100644 --- a/include/linux/pm.h +++ b/include/linux/pm.h @@ -165,6 +165,7 @@ struct pm_ops { int (*finish)(suspend_state_t state); }; +#ifdef CONFIG_SUSPEND extern struct pm_ops *pm_ops; /** @@ -193,6 +194,12 @@ extern void arch_suspend_disable_irqs(void); extern void arch_suspend_enable_irqs(void); extern int pm_suspend(suspend_state_t state); +#else /* !CONFIG_SUSPEND */ +#define suspend_valid_only_mem NULL + +static inline void pm_set_ops(struct pm_ops *pm_ops) {} +static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; } +#endif /* !CONFIG_SUSPEND */ /* * Device power management @@ -266,7 +273,7 @@ typedef struct pm_message { struct dev_pm_info { pm_message_t power_state; unsigned can_wakeup:1; -#ifdef CONFIG_PM +#ifdef CONFIG_PM_SLEEP unsigned should_wakeup:1; struct list_head entry; #endif @@ -276,7 +283,7 @@ extern int device_power_down(pm_message_t state); extern void device_power_up(void); extern void device_resume(void); -#ifdef CONFIG_PM +#ifdef CONFIG_PM_SLEEP extern int device_suspend(pm_message_t state); extern int device_prepare_suspend(pm_message_t state); @@ -306,7 +313,7 @@ static inline int call_platform_enable_wakeup(struct device *dev, int is_on) return 0; } -#else /* !CONFIG_PM */ +#else /* !CONFIG_PM_SLEEP */ static inline int device_suspend(pm_message_t state) { @@ -323,7 +330,7 @@ static inline int call_platform_enable_wakeup(struct device *dev, int is_on) return 0; } -#endif +#endif /* !CONFIG_PM_SLEEP */ /* changes to device_may_wakeup take effect on the next pm state change. * by default, devices should wakeup if they can. diff --git a/include/linux/suspend.h b/include/linux/suspend.h index d16c1b85d512..388cace9751f 100644 --- a/include/linux/suspend.h +++ b/include/linux/suspend.h @@ -24,7 +24,7 @@ struct pbe { extern void drain_local_pages(void); extern void mark_free_pages(struct zone *zone); -#if defined(CONFIG_PM) && defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE) +#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE) extern int pm_prepare_console(void); extern void pm_restore_console(void); #else @@ -54,7 +54,6 @@ struct hibernation_ops { void (*restore_cleanup)(void); }; -#ifdef CONFIG_PM #ifdef CONFIG_HIBERNATION /* kernel/power/snapshot.c */ extern void __register_nosave_region(unsigned long b, unsigned long e, int km); @@ -82,6 +81,7 @@ static inline void hibernation_set_ops(struct hibernation_ops *ops) {} static inline int hibernate(void) { return -ENOSYS; } #endif /* CONFIG_HIBERNATION */ +#ifdef CONFIG_PM_SLEEP void save_processor_state(void); void restore_processor_state(void); struct saved_context; @@ -106,7 +106,7 @@ static inline int unregister_pm_notifier(struct notifier_block *nb) { .notifier_call = fn, .priority = pri }; \ register_pm_notifier(&fn##_nb); \ } -#else /* CONFIG_PM */ +#else /* !CONFIG_PM_SLEEP */ static inline int register_pm_notifier(struct notifier_block *nb) { @@ -119,9 +119,9 @@ static inline int unregister_pm_notifier(struct notifier_block *nb) } #define pm_notifier(fn, pri) do { (void)(fn); } while (0) -#endif /* CONFIG_PM */ +#endif /* !CONFIG_PM_SLEEP */ -#if !defined CONFIG_HIBERNATION || !defined(CONFIG_PM) +#ifndef CONFIG_HIBERNATION static inline void register_nosave_region(unsigned long b, unsigned long e) { } diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig index c2582a4a5373..412859f8d94a 100644 --- a/kernel/power/Kconfig +++ b/kernel/power/Kconfig @@ -46,7 +46,7 @@ config PM_VERBOSE config DISABLE_CONSOLE_SUSPEND bool "Keep console(s) enabled during suspend/resume (DANGEROUS)" - depends on PM_DEBUG + depends on PM_DEBUG && PM_SLEEP default n ---help--- This option turns off the console suspend mechanism that prevents @@ -57,7 +57,7 @@ config DISABLE_CONSOLE_SUSPEND config PM_TRACE bool "Suspend/resume event tracing" - depends on PM_DEBUG && X86 && EXPERIMENTAL + depends on PM_DEBUG && X86 && PM_SLEEP && EXPERIMENTAL default n ---help--- This enables some cheesy code to save the last PM event point in the @@ -72,9 +72,37 @@ config PM_TRACE CAUTION: this option will cause your machine's real-time clock to be set to an invalid time after a resume. +config SUSPEND_SMP_POSSIBLE + bool + depends on (X86 && !X86_VOYAGER) || (PPC64 && (PPC_PSERIES || PPC_PMAC)) + depends on SMP + default y + +config SUSPEND_SMP + bool + depends on SUSPEND_SMP_POSSIBLE && PM_SLEEP + select HOTPLUG_CPU + default y + +config PM_SLEEP + bool + depends on SUSPEND || HIBERNATION + default y + +config SUSPEND + bool "Suspend to RAM and standby" + depends on PM + depends on !SMP || SUSPEND_SMP_POSSIBLE + default y + ---help--- + Allow the system to enter sleep states in which main memory is + powered and thus its contents are preserved, such as the + suspend-to-RAM state (i.e. the ACPI S3 state). + config HIBERNATION - bool "Hibernation" - depends on PM && SWAP && (((X86 || PPC64_SWSUSP) && (!SMP || SUSPEND_SMP)) || ((FRV || PPC32) && !SMP)) + bool "Hibernation (aka 'suspend to disk')" + depends on PM && SWAP + depends on ((X86 || PPC64_SWSUSP || FRV || PPC32) && !SMP) || SUSPEND_SMP_POSSIBLE ---help--- Enable the suspend to disk (STD) functionality, which is usually called "hibernation" in user interfaces. STD checkpoints the @@ -132,11 +160,6 @@ config PM_STD_PARTITION suspended image to. It will simply pick the first available swap device. -config SUSPEND_SMP - bool - depends on HOTPLUG_CPU && (X86 || PPC64) && PM - default y - config APM_EMULATION tristate "Advanced Power Management Emulation" depends on PM && SYS_SUPPORTS_APM_EMULATION diff --git a/kernel/power/Makefile b/kernel/power/Makefile index c6b03764512f..f7dfff28ecdb 100644 --- a/kernel/power/Makefile +++ b/kernel/power/Makefile @@ -3,8 +3,9 @@ ifeq ($(CONFIG_PM_DEBUG),y) EXTRA_CFLAGS += -DDEBUG endif -obj-y := main.o process.o console.o +obj-y := main.o obj-$(CONFIG_PM_LEGACY) += pm.o +obj-$(CONFIG_PM_SLEEP) += process.o console.o obj-$(CONFIG_HIBERNATION) += swsusp.o disk.o snapshot.o swap.o user.o obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o diff --git a/kernel/power/main.c b/kernel/power/main.c index cfba6987ae7d..350b485b3b60 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -25,11 +25,13 @@ BLOCKING_NOTIFIER_HEAD(pm_chain_head); -/*This is just an arbitrary number */ -#define FREE_PAGE_NUMBER (100) - DEFINE_MUTEX(pm_mutex); +#ifdef CONFIG_SUSPEND + +/* This is just an arbitrary number */ +#define FREE_PAGE_NUMBER (100) + struct pm_ops *pm_ops; /** @@ -269,6 +271,8 @@ int pm_suspend(suspend_state_t state) EXPORT_SYMBOL(pm_suspend); +#endif /* CONFIG_SUSPEND */ + decl_subsys(power,NULL,NULL); @@ -285,13 +289,15 @@ decl_subsys(power,NULL,NULL); static ssize_t state_show(struct kset *kset, char *buf) { + char *s = buf; +#ifdef CONFIG_SUSPEND int i; - char * s = buf; for (i = 0; i < PM_SUSPEND_MAX; i++) { if (pm_states[i] && valid_state(i)) s += sprintf(s,"%s ", pm_states[i]); } +#endif #ifdef CONFIG_HIBERNATION s += sprintf(s, "%s\n", "disk"); #else @@ -304,11 +310,13 @@ static ssize_t state_show(struct kset *kset, char *buf) static ssize_t state_store(struct kset *kset, const char *buf, size_t n) { +#ifdef CONFIG_SUSPEND suspend_state_t state = PM_SUSPEND_STANDBY; const char * const *s; +#endif char *p; - int error; int len; + int error = -EINVAL; p = memchr(buf, '\n', n); len = p ? p - buf : n; @@ -316,17 +324,19 @@ static ssize_t state_store(struct kset *kset, const char *buf, size_t n) /* First, check if we are requested to hibernate */ if (len == 4 && !strncmp(buf, "disk", len)) { error = hibernate(); - return error ? error : n; + goto Exit; } +#ifdef CONFIG_SUSPEND for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) { if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) break; } if (state < PM_SUSPEND_MAX && *s) error = enter_state(state); - else - error = -EINVAL; +#endif + + Exit: return error ? error : n; } diff --git a/kernel/power/power.h b/kernel/power/power.h index 9080914796f5..95fbf2dd3fe3 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -176,9 +176,17 @@ struct timeval; extern void swsusp_show_speed(struct timeval *, struct timeval *, unsigned int, char *); +#ifdef CONFIG_SUSPEND /* kernel/power/main.c */ -extern int suspend_enter(suspend_state_t state); extern int suspend_devices_and_enter(suspend_state_t state); +#else /* !CONFIG_SUSPEND */ +static inline int suspend_devices_and_enter(suspend_state_t state) +{ + return -ENOSYS; +} +#endif /* !CONFIG_SUSPEND */ + +/* kernel/power/common.c */ extern struct blocking_notifier_head pm_chain_head; static inline int pm_notifier_call_chain(unsigned long val) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 6d3550ca0282..0bd4d82ddfff 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -726,7 +726,7 @@ static void __drain_pages(unsigned int cpu) } } -#ifdef CONFIG_PM +#ifdef CONFIG_HIBERNATION void mark_free_pages(struct zone *zone) { @@ -772,7 +772,7 @@ void drain_local_pages(void) __drain_pages(smp_processor_id()); local_irq_restore(flags); } -#endif /* CONFIG_PM */ +#endif /* CONFIG_HIBERNATION */ /* * Free a 0-order page -- GitLab