File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/kernel/workqueue_internal.h b/kernel/workqueue_internal.h
new file mode 100644
index 0000000..3fa9c14
--- /dev/null
+++ b/kernel/workqueue_internal.h
@@ -0,0 +1,75 @@
+/*
+ * kernel/workqueue_internal.h
+ *
+ * Workqueue internal header file. Only to be included by workqueue and
+ * core kernel subsystems.
+ */
+#ifndef _KERNEL_WORKQUEUE_INTERNAL_H
+#define _KERNEL_WORKQUEUE_INTERNAL_H
+
+#include <linux/workqueue.h>
+#include <linux/kthread.h>
+#include <linux/preempt.h>
+
+struct worker_pool;
+
+/*
+ * The poor guys doing the actual heavy lifting. All on-duty workers are
+ * either serving the manager role, on idle list or on busy hash. For
+ * details on the locking annotation (L, I, X...), refer to workqueue.c.
+ *
+ * Only to be used in workqueue and async.
+ */
+struct worker {
+ /* on idle list while idle, on busy hash table while busy */
+ union {
+ struct list_head entry; /* L: while idle */
+ struct hlist_node hentry; /* L: while busy */
+ };
+
+ struct work_struct *current_work; /* L: work being processed */
+ work_func_t current_func; /* L: current_work's fn */
+ struct pool_workqueue *current_pwq; /* L: current_work's pwq */
+ bool desc_valid; /* ->desc is valid */
+ struct list_head scheduled; /* L: scheduled works */
+
+ /* 64 bytes boundary on 64bit, 32 on 32bit */
+
+ struct task_struct *task; /* I: worker task */
+ struct worker_pool *pool; /* I: the associated pool */
+ /* L: for rescuers */
+ struct list_head node; /* A: anchored at pool->workers */
+ /* A: runs through worker->node */
+
+ unsigned long last_active; /* L: last active timestamp */
+ unsigned int flags; /* X: flags */
+ int id; /* I: worker id */
+
+ /*
+ * Opaque string set with work_set_desc(). Printed out with task
+ * dump for debugging - WARN, BUG, panic or sysrq.
+ */
+ char desc[WORKER_DESC_LEN];
+
+ /* used only by rescuers to point to the target workqueue */
+ struct workqueue_struct *rescue_wq; /* I: the workqueue to rescue */
+};
+
+/**
+ * current_wq_worker - return struct worker if %current is a workqueue worker
+ */
+static inline struct worker *current_wq_worker(void)
+{
+ if (in_task() && (current->flags & PF_WQ_WORKER))
+ return kthread_data(current);
+ return NULL;
+}
+
+/*
+ * Scheduler hooks for concurrency managed workqueue. Only to be used from
+ * sched/core.c and workqueue.c.
+ */
+void wq_worker_waking_up(struct task_struct *task, int cpu);
+struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu);
+
+#endif /* _KERNEL_WORKQUEUE_INTERNAL_H */