Initial import

1 files changed, 592 insertions, 0 deletions

diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
new file mode 100644
index 000000000..deee212af
--- /dev/null
+++ b/include/linux/workqueue.h
@@ -0,0 +1,592 @@
+/*
+ * workqueue.h --- work queue handling for Linux.
+ */
+
+#ifndef _LINUX_WORKQUEUE_H
+#define _LINUX_WORKQUEUE_H
+
+#include <linux/timer.h>
+#include <linux/linkage.h>
+#include <linux/bitops.h>
+#include <linux/lockdep.h>
+#include <linux/threads.h>
+#include <linux/atomic.h>
+#include <linux/cpumask.h>
+
+struct workqueue_struct;
+
+struct work_struct;
+typedef void (*work_func_t)(struct work_struct *work);
+void delayed_work_timer_fn(unsigned long __data);
+
+/*
+ * The first word is the work queue pointer and the flags rolled into
+ * one
+ */
+#define work_data_bits(work) ((unsigned long *)(&(work)->data))
+
+enum {
+	WORK_STRUCT_PENDING_BIT	= 0,	/* work item is pending execution */
+	WORK_STRUCT_DELAYED_BIT	= 1,	/* work item is delayed */
+	WORK_STRUCT_PWQ_BIT	= 2,	/* data points to pwq */
+	WORK_STRUCT_LINKED_BIT	= 3,	/* next work is linked to this one */
+#ifdef CONFIG_DEBUG_OBJECTS_WORK
+	WORK_STRUCT_STATIC_BIT	= 4,	/* static initializer (debugobjects) */
+	WORK_STRUCT_COLOR_SHIFT	= 5,	/* color for workqueue flushing */
+#else
+	WORK_STRUCT_COLOR_SHIFT	= 4,	/* color for workqueue flushing */
+#endif
+
+	WORK_STRUCT_COLOR_BITS	= 4,
+
+	WORK_STRUCT_PENDING	= 1 << WORK_STRUCT_PENDING_BIT,
+	WORK_STRUCT_DELAYED	= 1 << WORK_STRUCT_DELAYED_BIT,
+	WORK_STRUCT_PWQ		= 1 << WORK_STRUCT_PWQ_BIT,
+	WORK_STRUCT_LINKED	= 1 << WORK_STRUCT_LINKED_BIT,
+#ifdef CONFIG_DEBUG_OBJECTS_WORK
+	WORK_STRUCT_STATIC	= 1 << WORK_STRUCT_STATIC_BIT,
+#else
+	WORK_STRUCT_STATIC	= 0,
+#endif
+
+	/*
+	 * The last color is no color used for works which don't
+	 * participate in workqueue flushing.
+	 */
+	WORK_NR_COLORS		= (1 << WORK_STRUCT_COLOR_BITS) - 1,
+	WORK_NO_COLOR		= WORK_NR_COLORS,
+
+	/* not bound to any CPU, prefer the local CPU */
+	WORK_CPU_UNBOUND	= NR_CPUS,
+
+	/*
+	 * Reserve 7 bits off of pwq pointer w/ debugobjects turned off.
+	 * This makes pwqs aligned to 256 bytes and allows 15 workqueue
+	 * flush colors.
+	 */
+	WORK_STRUCT_FLAG_BITS	= WORK_STRUCT_COLOR_SHIFT +
+				  WORK_STRUCT_COLOR_BITS,
+
+	/* data contains off-queue information when !WORK_STRUCT_PWQ */
+	WORK_OFFQ_FLAG_BASE	= WORK_STRUCT_COLOR_SHIFT,
+
+	__WORK_OFFQ_CANCELING	= WORK_OFFQ_FLAG_BASE,
+	WORK_OFFQ_CANCELING	= (1 << __WORK_OFFQ_CANCELING),
+
+	/*
+	 * When a work item is off queue, its high bits point to the last
+	 * pool it was on.  Cap at 31 bits and use the highest number to
+	 * indicate that no pool is associated.
+	 */
+	WORK_OFFQ_FLAG_BITS	= 1,
+	WORK_OFFQ_POOL_SHIFT	= WORK_OFFQ_FLAG_BASE + WORK_OFFQ_FLAG_BITS,
+	WORK_OFFQ_LEFT		= BITS_PER_LONG - WORK_OFFQ_POOL_SHIFT,
+	WORK_OFFQ_POOL_BITS	= WORK_OFFQ_LEFT <= 31 ? WORK_OFFQ_LEFT : 31,
+	WORK_OFFQ_POOL_NONE	= (1LU << WORK_OFFQ_POOL_BITS) - 1,
+
+	/* convenience constants */
+	WORK_STRUCT_FLAG_MASK	= (1UL << WORK_STRUCT_FLAG_BITS) - 1,
+	WORK_STRUCT_WQ_DATA_MASK = ~WORK_STRUCT_FLAG_MASK,
+	WORK_STRUCT_NO_POOL	= (unsigned long)WORK_OFFQ_POOL_NONE << WORK_OFFQ_POOL_SHIFT,
+
+	/* bit mask for work_busy() return values */
+	WORK_BUSY_PENDING	= 1 << 0,
+	WORK_BUSY_RUNNING	= 1 << 1,
+
+	/* maximum string length for set_worker_desc() */
+	WORKER_DESC_LEN		= 24,
+};
+
+struct work_struct {
+	atomic_long_t data;
+	struct list_head entry;
+	work_func_t func;
+#ifdef CONFIG_LOCKDEP
+	struct lockdep_map lockdep_map;
+#endif
+};
+
+#define WORK_DATA_INIT()	ATOMIC_LONG_INIT(WORK_STRUCT_NO_POOL)
+#define WORK_DATA_STATIC_INIT()	\
+	ATOMIC_LONG_INIT(WORK_STRUCT_NO_POOL | WORK_STRUCT_STATIC)
+
+struct delayed_work {
+	struct work_struct work;
+	struct timer_list timer;
+
+	/* target workqueue and CPU ->timer uses to queue ->work */
+	struct workqueue_struct *wq;
+	int cpu;
+};
+
+/*
+ * A struct for workqueue attributes.  This can be used to change
+ * attributes of an unbound workqueue.
+ *
+ * Unlike other fields, ->no_numa isn't a property of a worker_pool.  It
+ * only modifies how apply_workqueue_attrs() select pools and thus doesn't
+ * participate in pool hash calculations or equality comparisons.
+ */
+struct workqueue_attrs {
+	int			nice;		/* nice level */
+	cpumask_var_t		cpumask;	/* allowed CPUs */
+	bool			no_numa;	/* disable NUMA affinity */
+};
+
+static inline struct delayed_work *to_delayed_work(struct work_struct *work)
+{
+	return container_of(work, struct delayed_work, work);
+}
+
+struct execute_work {
+	struct work_struct work;
+};
+
+#ifdef CONFIG_LOCKDEP
+/*
+ * NB: because we have to copy the lockdep_map, setting _key
+ * here is required, otherwise it could get initialised to the
+ * copy of the lockdep_map!
+ */
+#define __WORK_INIT_LOCKDEP_MAP(n, k) \
+	.lockdep_map = STATIC_LOCKDEP_MAP_INIT(n, k),
+#else
+#define __WORK_INIT_LOCKDEP_MAP(n, k)
+#endif
+
+#define __WORK_INITIALIZER(n, f) {					\
+	.data = WORK_DATA_STATIC_INIT(),				\
+	.entry	= { &(n).entry, &(n).entry },				\
+	.func = (f),							\
+	__WORK_INIT_LOCKDEP_MAP(#n, &(n))				\
+	}
+
+#define __DELAYED_WORK_INITIALIZER(n, f, tflags) {			\
+	.work = __WORK_INITIALIZER((n).work, (f)),			\
+	.timer = __TIMER_INITIALIZER(delayed_work_timer_fn,		\
+				     0, (unsigned long)&(n),		\
+				     (tflags) | TIMER_IRQSAFE),		\
+	}
+
+#define DECLARE_WORK(n, f)						\
+	struct work_struct n = __WORK_INITIALIZER(n, f)
+
+#define DECLARE_DELAYED_WORK(n, f)					\
+	struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, 0)
+
+#define DECLARE_DEFERRABLE_WORK(n, f)					\
+	struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, TIMER_DEFERRABLE)
+
+#ifdef CONFIG_DEBUG_OBJECTS_WORK
+extern void __init_work(struct work_struct *work, int onstack);
+extern void destroy_work_on_stack(struct work_struct *work);
+extern void destroy_delayed_work_on_stack(struct delayed_work *work);
+static inline unsigned int work_static(struct work_struct *work)
+{
+	return *work_data_bits(work) & WORK_STRUCT_STATIC;
+}
+#else
+static inline void __init_work(struct work_struct *work, int onstack) { }
+static inline void destroy_work_on_stack(struct work_struct *work) { }
+static inline void destroy_delayed_work_on_stack(struct delayed_work *work) { }
+static inline unsigned int work_static(struct work_struct *work) { return 0; }
+#endif
+
+/*
+ * initialize all of a work item in one go
+ *
+ * NOTE! No point in using "atomic_long_set()": using a direct
+ * assignment of the work data initializer allows the compiler
+ * to generate better code.
+ */
+#ifdef CONFIG_LOCKDEP
+#define __INIT_WORK(_work, _func, _onstack)				\
+	do {								\
+		static struct lock_class_key __key;			\
+									\
+		__init_work((_work), _onstack);				\
+		(_work)->data = (atomic_long_t) WORK_DATA_INIT();	\
+		lockdep_init_map(&(_work)->lockdep_map, #_work, &__key, 0); \
+		INIT_LIST_HEAD(&(_work)->entry);			\
+		(_work)->func = (_func);				\
+	} while (0)
+#else
+#define __INIT_WORK(_work, _func, _onstack)				\
+	do {								\
+		__init_work((_work), _onstack);				\
+		(_work)->data = (atomic_long_t) WORK_DATA_INIT();	\
+		INIT_LIST_HEAD(&(_work)->entry);			\
+		(_work)->func = (_func);				\
+	} while (0)
+#endif
+
+#define INIT_WORK(_work, _func)						\
+	__INIT_WORK((_work), (_func), 0)
+
+#define INIT_WORK_ONSTACK(_work, _func)					\
+	__INIT_WORK((_work), (_func), 1)
+
+#define __INIT_DELAYED_WORK(_work, _func, _tflags)			\
+	do {								\
+		INIT_WORK(&(_work)->work, (_func));			\
+		__setup_timer(&(_work)->timer, delayed_work_timer_fn,	\
+			      (unsigned long)(_work),			\
+			      (_tflags) | TIMER_IRQSAFE);		\
+	} while (0)
+
+#define __INIT_DELAYED_WORK_ONSTACK(_work, _func, _tflags)		\
+	do {								\
+		INIT_WORK_ONSTACK(&(_work)->work, (_func));		\
+		__setup_timer_on_stack(&(_work)->timer,			\
+				       delayed_work_timer_fn,		\
+				       (unsigned long)(_work),		\
+				       (_tflags) | TIMER_IRQSAFE);	\
+	} while (0)
+
+#define INIT_DELAYED_WORK(_work, _func)					\
+	__INIT_DELAYED_WORK(_work, _func, 0)
+
+#define INIT_DELAYED_WORK_ONSTACK(_work, _func)				\
+	__INIT_DELAYED_WORK_ONSTACK(_work, _func, 0)
+
+#define INIT_DEFERRABLE_WORK(_work, _func)				\
+	__INIT_DELAYED_WORK(_work, _func, TIMER_DEFERRABLE)
+
+#define INIT_DEFERRABLE_WORK_ONSTACK(_work, _func)			\
+	__INIT_DELAYED_WORK_ONSTACK(_work, _func, TIMER_DEFERRABLE)
+
+/**
+ * work_pending - Find out whether a work item is currently pending
+ * @work: The work item in question
+ */
+#define work_pending(work) \
+	test_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))
+
+/**
+ * delayed_work_pending - Find out whether a delayable work item is currently
+ * pending
+ * @work: The work item in question
+ */
+#define delayed_work_pending(w) \
+	work_pending(&(w)->work)
+
+/*
+ * Workqueue flags and constants.  For details, please refer to
+ * Documentation/workqueue.txt.
+ */
+enum {
+	WQ_UNBOUND		= 1 << 1, /* not bound to any cpu */
+	WQ_FREEZABLE		= 1 << 2, /* freeze during suspend */
+	WQ_MEM_RECLAIM		= 1 << 3, /* may be used for memory reclaim */
+	WQ_HIGHPRI		= 1 << 4, /* high priority */
+	WQ_CPU_INTENSIVE	= 1 << 5, /* cpu intensive workqueue */
+	WQ_SYSFS		= 1 << 6, /* visible in sysfs, see wq_sysfs_register() */
+
+	/*
+	 * Per-cpu workqueues are generally preferred because they tend to
+	 * show better performance thanks to cache locality.  Per-cpu
+	 * workqueues exclude the scheduler from choosing the CPU to
+	 * execute the worker threads, which has an unfortunate side effect
+	 * of increasing power consumption.
+	 *
+	 * The scheduler considers a CPU idle if it doesn't have any task
+	 * to execute and tries to keep idle cores idle to conserve power;
+	 * however, for example, a per-cpu work item scheduled from an
+	 * interrupt handler on an idle CPU will force the scheduler to
+	 * excute the work item on that CPU breaking the idleness, which in
+	 * turn may lead to more scheduling choices which are sub-optimal
+	 * in terms of power consumption.
+	 *
+	 * Workqueues marked with WQ_POWER_EFFICIENT are per-cpu by default
+	 * but become unbound if workqueue.power_efficient kernel param is
+	 * specified.  Per-cpu workqueues which are identified to
+	 * contribute significantly to power-consumption are identified and
+	 * marked with this flag and enabling the power_efficient mode
+	 * leads to noticeable power saving at the cost of small
+	 * performance disadvantage.
+	 *
+	 * http://thread.gmane.org/gmane.linux.kernel/1480396
+	 */
+	WQ_POWER_EFFICIENT	= 1 << 7,
+
+	__WQ_DRAINING		= 1 << 16, /* internal: workqueue is draining */
+	__WQ_ORDERED		= 1 << 17, /* internal: workqueue is ordered */
+
+	WQ_MAX_ACTIVE		= 512,	  /* I like 512, better ideas? */
+	WQ_MAX_UNBOUND_PER_CPU	= 4,	  /* 4 * #cpus for unbound wq */
+	WQ_DFL_ACTIVE		= WQ_MAX_ACTIVE / 2,
+};
+
+/* unbound wq's aren't per-cpu, scale max_active according to #cpus */
+#define WQ_UNBOUND_MAX_ACTIVE	\
+	max_t(int, WQ_MAX_ACTIVE, num_possible_cpus() * WQ_MAX_UNBOUND_PER_CPU)
+
+/*
+ * System-wide workqueues which are always present.
+ *
+ * system_wq is the one used by schedule[_delayed]_work[_on]().
+ * Multi-CPU multi-threaded.  There are users which expect relatively
+ * short queue flush time.  Don't queue works which can run for too
+ * long.
+ *
+ * system_highpri_wq is similar to system_wq but for work items which
+ * require WQ_HIGHPRI.
+ *
+ * system_long_wq is similar to system_wq but may host long running
+ * works.  Queue flushing might take relatively long.
+ *
+ * system_unbound_wq is unbound workqueue.  Workers are not bound to
+ * any specific CPU, not concurrency managed, and all queued works are
+ * executed immediately as long as max_active limit is not reached and
+ * resources are available.
+ *
+ * system_freezable_wq is equivalent to system_wq except that it's
+ * freezable.
+ *
+ * *_power_efficient_wq are inclined towards saving power and converted
+ * into WQ_UNBOUND variants if 'wq_power_efficient' is enabled; otherwise,
+ * they are same as their non-power-efficient counterparts - e.g.
+ * system_power_efficient_wq is identical to system_wq if
+ * 'wq_power_efficient' is disabled.  See WQ_POWER_EFFICIENT for more info.
+ */
+extern struct workqueue_struct *system_wq;
+extern struct workqueue_struct *system_highpri_wq;
+extern struct workqueue_struct *system_long_wq;
+extern struct workqueue_struct *system_unbound_wq;
+extern struct workqueue_struct *system_freezable_wq;
+extern struct workqueue_struct *system_power_efficient_wq;
+extern struct workqueue_struct *system_freezable_power_efficient_wq;
+
+extern struct workqueue_struct *
+__alloc_workqueue_key(const char *fmt, unsigned int flags, int max_active,
+	struct lock_class_key *key, const char *lock_name, ...) __printf(1, 6);
+
+/**
+ * alloc_workqueue - allocate a workqueue
+ * @fmt: printf format for the name of the workqueue
+ * @flags: WQ_* flags
+ * @max_active: max in-flight work items, 0 for default
+ * @args: args for @fmt
+ *
+ * Allocate a workqueue with the specified parameters.  For detailed
+ * information on WQ_* flags, please refer to Documentation/workqueue.txt.
+ *
+ * The __lock_name macro dance is to guarantee that single lock_class_key
+ * doesn't end up with different namesm, which isn't allowed by lockdep.
+ *
+ * RETURNS:
+ * Pointer to the allocated workqueue on success, %NULL on failure.
+ */
+#ifdef CONFIG_LOCKDEP
+#define alloc_workqueue(fmt, flags, max_active, args...)		\
+({									\
+	static struct lock_class_key __key;				\
+	const char *__lock_name;					\
+									\
+	__lock_name = #fmt#args;					\
+									\
+	__alloc_workqueue_key((fmt), (flags), (max_active),		\
+			      &__key, __lock_name, ##args);		\
+})
+#else
+#define alloc_workqueue(fmt, flags, max_active, args...)		\
+	__alloc_workqueue_key((fmt), (flags), (max_active),		\
+			      NULL, NULL, ##args)
+#endif
+
+/**
+ * alloc_ordered_workqueue - allocate an ordered workqueue
+ * @fmt: printf format for the name of the workqueue
+ * @flags: WQ_* flags (only WQ_FREEZABLE and WQ_MEM_RECLAIM are meaningful)
+ * @args: args for @fmt
+ *
+ * Allocate an ordered workqueue.  An ordered workqueue executes at
+ * most one work item at any given time in the queued order.  They are
+ * implemented as unbound workqueues with @max_active of one.
+ *
+ * RETURNS:
+ * Pointer to the allocated workqueue on success, %NULL on failure.
+ */
+#define alloc_ordered_workqueue(fmt, flags, args...)			\
+	alloc_workqueue(fmt, WQ_UNBOUND | __WQ_ORDERED | (flags), 1, ##args)
+
+#define create_workqueue(name)						\
+	alloc_workqueue("%s", WQ_MEM_RECLAIM, 1, (name))
+#define create_freezable_workqueue(name)				\
+	alloc_workqueue("%s", WQ_FREEZABLE | WQ_UNBOUND | WQ_MEM_RECLAIM, \
+			1, (name))
+#define create_singlethread_workqueue(name)				\
+	alloc_ordered_workqueue("%s", WQ_MEM_RECLAIM, name)
+
+extern void destroy_workqueue(struct workqueue_struct *wq);
+
+struct workqueue_attrs *alloc_workqueue_attrs(gfp_t gfp_mask);
+void free_workqueue_attrs(struct workqueue_attrs *attrs);
+int apply_workqueue_attrs(struct workqueue_struct *wq,
+			  const struct workqueue_attrs *attrs);
+
+extern bool queue_work_on(int cpu, struct workqueue_struct *wq,
+			struct work_struct *work);
+extern bool queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
+			struct delayed_work *work, unsigned long delay);
+extern bool mod_delayed_work_on(int cpu, struct workqueue_struct *wq,
+			struct delayed_work *dwork, unsigned long delay);
+
+extern void flush_workqueue(struct workqueue_struct *wq);
+extern void drain_workqueue(struct workqueue_struct *wq);
+extern void flush_scheduled_work(void);
+
+extern int schedule_on_each_cpu(work_func_t func);
+
+int execute_in_process_context(work_func_t fn, struct execute_work *);
+
+extern bool flush_work(struct work_struct *work);
+extern bool cancel_work_sync(struct work_struct *work);
+
+extern bool flush_delayed_work(struct delayed_work *dwork);
+extern bool cancel_delayed_work(struct delayed_work *dwork);
+extern bool cancel_delayed_work_sync(struct delayed_work *dwork);
+
+extern void workqueue_set_max_active(struct workqueue_struct *wq,
+				     int max_active);
+extern bool current_is_workqueue_rescuer(void);
+extern bool workqueue_congested(int cpu, struct workqueue_struct *wq);
+extern unsigned int work_busy(struct work_struct *work);
+extern __printf(1, 2) void set_worker_desc(const char *fmt, ...);
+extern void print_worker_info(const char *log_lvl, struct task_struct *task);
+extern void show_workqueue_state(void);
+
+/**
+ * queue_work - queue work on a workqueue
+ * @wq: workqueue to use
+ * @work: work to queue
+ *
+ * Returns %false if @work was already on a queue, %true otherwise.
+ *
+ * We queue the work to the CPU on which it was submitted, but if the CPU dies
+ * it can be processed by another CPU.
+ */
+static inline bool queue_work(struct workqueue_struct *wq,
+			      struct work_struct *work)
+{
+	return queue_work_on(WORK_CPU_UNBOUND, wq, work);
+}
+
+/**
+ * queue_delayed_work - queue work on a workqueue after delay
+ * @wq: workqueue to use
+ * @dwork: delayable work to queue
+ * @delay: number of jiffies to wait before queueing
+ *
+ * Equivalent to queue_delayed_work_on() but tries to use the local CPU.
+ */
+static inline bool queue_delayed_work(struct workqueue_struct *wq,
+				      struct delayed_work *dwork,
+				      unsigned long delay)
+{
+	return queue_delayed_work_on(WORK_CPU_UNBOUND, wq, dwork, delay);
+}
+
+/**
+ * mod_delayed_work - modify delay of or queue a delayed work
+ * @wq: workqueue to use
+ * @dwork: work to queue
+ * @delay: number of jiffies to wait before queueing
+ *
+ * mod_delayed_work_on() on local CPU.
+ */
+static inline bool mod_delayed_work(struct workqueue_struct *wq,
+				    struct delayed_work *dwork,
+				    unsigned long delay)
+{
+	return mod_delayed_work_on(WORK_CPU_UNBOUND, wq, dwork, delay);
+}
+
+/**
+ * schedule_work_on - put work task on a specific cpu
+ * @cpu: cpu to put the work task on
+ * @work: job to be done
+ *
+ * This puts a job on a specific cpu
+ */
+static inline bool schedule_work_on(int cpu, struct work_struct *work)
+{
+	return queue_work_on(cpu, system_wq, work);
+}
+
+/**
+ * schedule_work - put work task in global workqueue
+ * @work: job to be done
+ *
+ * Returns %false if @work was already on the kernel-global workqueue and
+ * %true otherwise.
+ *
+ * This puts a job in the kernel-global workqueue if it was not already
+ * queued and leaves it in the same position on the kernel-global
+ * workqueue otherwise.
+ */
+static inline bool schedule_work(struct work_struct *work)
+{
+	return queue_work(system_wq, work);
+}
+
+/**
+ * schedule_delayed_work_on - queue work in global workqueue on CPU after delay
+ * @cpu: cpu to use
+ * @dwork: job to be done
+ * @delay: number of jiffies to wait
+ *
+ * After waiting for a given time this puts a job in the kernel-global
+ * workqueue on the specified CPU.
+ */
+static inline bool schedule_delayed_work_on(int cpu, struct delayed_work *dwork,
+					    unsigned long delay)
+{
+	return queue_delayed_work_on(cpu, system_wq, dwork, delay);
+}
+
+/**
+ * schedule_delayed_work - put work task in global workqueue after delay
+ * @dwork: job to be done
+ * @delay: number of jiffies to wait or 0 for immediate execution
+ *
+ * After waiting for a given time this puts a job in the kernel-global
+ * workqueue.
+ */
+static inline bool schedule_delayed_work(struct delayed_work *dwork,
+					 unsigned long delay)
+{
+	return queue_delayed_work(system_wq, dwork, delay);
+}
+
+/**
+ * keventd_up - is workqueue initialized yet?
+ */
+static inline bool keventd_up(void)
+{
+	return system_wq != NULL;
+}
+
+#ifndef CONFIG_SMP
+static inline long work_on_cpu(int cpu, long (*fn)(void *), void *arg)
+{
+	return fn(arg);
+}
+#else
+long work_on_cpu(int cpu, long (*fn)(void *), void *arg);
+#endif /* CONFIG_SMP */
+
+#ifdef CONFIG_FREEZER
+extern void freeze_workqueues_begin(void);
+extern bool freeze_workqueues_busy(void);
+extern void thaw_workqueues(void);
+#endif /* CONFIG_FREEZER */
+
+#ifdef CONFIG_SYSFS
+int workqueue_sysfs_register(struct workqueue_struct *wq);
+#else	/* CONFIG_SYSFS */
+static inline int workqueue_sysfs_register(struct workqueue_struct *wq)
+{ return 0; }
+#endif	/* CONFIG_SYSFS */
+
+#endif