v4.19.13 snapshot.
diff --git a/include/linux/padata.h b/include/linux/padata.h
new file mode 100644
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--- /dev/null
+++ b/include/linux/padata.h
@@ -0,0 +1,185 @@
+/*
+ * padata.h - header for the padata parallelization interface
+ *
+ * Copyright (C) 2008, 2009 secunet Security Networks AG
+ * Copyright (C) 2008, 2009 Steffen Klassert <steffen.klassert@secunet.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef PADATA_H
+#define PADATA_H
+
+#include <linux/workqueue.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/timer.h>
+#include <linux/notifier.h>
+#include <linux/kobject.h>
+
+#define PADATA_CPU_SERIAL 0x01
+#define PADATA_CPU_PARALLEL 0x02
+
+/**
+ * struct padata_priv - Embedded to the users data structure.
+ *
+ * @list: List entry, to attach to the padata lists.
+ * @pd: Pointer to the internal control structure.
+ * @cb_cpu: Callback cpu for serializatioon.
+ * @cpu: Cpu for parallelization.
+ * @seq_nr: Sequence number of the parallelized data object.
+ * @info: Used to pass information from the parallel to the serial function.
+ * @parallel: Parallel execution function.
+ * @serial: Serial complete function.
+ */
+struct padata_priv {
+ struct list_head list;
+ struct parallel_data *pd;
+ int cb_cpu;
+ int cpu;
+ int info;
+ void (*parallel)(struct padata_priv *padata);
+ void (*serial)(struct padata_priv *padata);
+};
+
+/**
+ * struct padata_list
+ *
+ * @list: List head.
+ * @lock: List lock.
+ */
+struct padata_list {
+ struct list_head list;
+ spinlock_t lock;
+};
+
+/**
+* struct padata_serial_queue - The percpu padata serial queue
+*
+* @serial: List to wait for serialization after reordering.
+* @work: work struct for serialization.
+* @pd: Backpointer to the internal control structure.
+*/
+struct padata_serial_queue {
+ struct padata_list serial;
+ struct work_struct work;
+ struct parallel_data *pd;
+};
+
+/**
+ * struct padata_parallel_queue - The percpu padata parallel queue
+ *
+ * @parallel: List to wait for parallelization.
+ * @reorder: List to wait for reordering after parallel processing.
+ * @serial: List to wait for serialization after reordering.
+ * @pwork: work struct for parallelization.
+ * @swork: work struct for serialization.
+ * @pd: Backpointer to the internal control structure.
+ * @work: work struct for parallelization.
+ * @reorder_work: work struct for reordering.
+ * @num_obj: Number of objects that are processed by this cpu.
+ * @cpu_index: Index of the cpu.
+ */
+struct padata_parallel_queue {
+ struct padata_list parallel;
+ struct padata_list reorder;
+ struct parallel_data *pd;
+ struct work_struct work;
+ struct work_struct reorder_work;
+ atomic_t num_obj;
+ int cpu_index;
+};
+
+/**
+ * struct padata_cpumask - The cpumasks for the parallel/serial workers
+ *
+ * @pcpu: cpumask for the parallel workers.
+ * @cbcpu: cpumask for the serial (callback) workers.
+ */
+struct padata_cpumask {
+ cpumask_var_t pcpu;
+ cpumask_var_t cbcpu;
+};
+
+/**
+ * struct parallel_data - Internal control structure, covers everything
+ * that depends on the cpumask in use.
+ *
+ * @pinst: padata instance.
+ * @pqueue: percpu padata queues used for parallelization.
+ * @squeue: percpu padata queues used for serialuzation.
+ * @reorder_objects: Number of objects waiting in the reorder queues.
+ * @refcnt: Number of objects holding a reference on this parallel_data.
+ * @max_seq_nr: Maximal used sequence number.
+ * @cpumask: The cpumasks in use for parallel and serial workers.
+ * @lock: Reorder lock.
+ * @processed: Number of already processed objects.
+ * @timer: Reorder timer.
+ */
+struct parallel_data {
+ struct padata_instance *pinst;
+ struct padata_parallel_queue __percpu *pqueue;
+ struct padata_serial_queue __percpu *squeue;
+ atomic_t reorder_objects;
+ atomic_t refcnt;
+ atomic_t seq_nr;
+ struct padata_cpumask cpumask;
+ spinlock_t lock ____cacheline_aligned;
+ unsigned int processed;
+ struct timer_list timer;
+};
+
+/**
+ * struct padata_instance - The overall control structure.
+ *
+ * @cpu_notifier: cpu hotplug notifier.
+ * @wq: The workqueue in use.
+ * @pd: The internal control structure.
+ * @cpumask: User supplied cpumasks for parallel and serial works.
+ * @cpumask_change_notifier: Notifiers chain for user-defined notify
+ * callbacks that will be called when either @pcpu or @cbcpu
+ * or both cpumasks change.
+ * @kobj: padata instance kernel object.
+ * @lock: padata instance lock.
+ * @flags: padata flags.
+ */
+struct padata_instance {
+ struct hlist_node node;
+ struct workqueue_struct *wq;
+ struct parallel_data *pd;
+ struct padata_cpumask cpumask;
+ struct blocking_notifier_head cpumask_change_notifier;
+ struct kobject kobj;
+ struct mutex lock;
+ u8 flags;
+#define PADATA_INIT 1
+#define PADATA_RESET 2
+#define PADATA_INVALID 4
+};
+
+extern struct padata_instance *padata_alloc_possible(
+ struct workqueue_struct *wq);
+extern void padata_free(struct padata_instance *pinst);
+extern int padata_do_parallel(struct padata_instance *pinst,
+ struct padata_priv *padata, int cb_cpu);
+extern void padata_do_serial(struct padata_priv *padata);
+extern int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type,
+ cpumask_var_t cpumask);
+extern int padata_start(struct padata_instance *pinst);
+extern void padata_stop(struct padata_instance *pinst);
+extern int padata_register_cpumask_notifier(struct padata_instance *pinst,
+ struct notifier_block *nblock);
+extern int padata_unregister_cpumask_notifier(struct padata_instance *pinst,
+ struct notifier_block *nblock);
+#endif