staging: lustre: libcfs: remove workitem code.

There are now no users.  workqueues are doing the job
that this used to do.
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/include/linux/libcfs/libcfs.h

@@ -45,7 +45,6 @@
 #include <linux/libcfs/libcfs_prim.h>
 #include <linux/libcfs/libcfs_time.h>
 #include <linux/libcfs/libcfs_string.h>
-#include <linux/libcfs/libcfs_workitem.h>
 #include <linux/libcfs/libcfs_hash.h>
 #include <linux/libcfs/libcfs_fail.h>
 #include <linux/libcfs/curproc.h>

drivers/staging/lustre/include/linux/libcfs/libcfs_workitem.h

-// SPDX-License-Identifier: GPL-2.0
-/*
- * GPL HEADER START
- *
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 only,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that 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 version 2 for more details (a copy is included
- * in the LICENSE file that accompanied this code).
- *
- * You should have received a copy of the GNU General Public License
- * version 2 along with this program; If not, see
- * http://www.gnu.org/licenses/gpl-2.0.html
- *
- * GPL HEADER END
- */
-/*
- * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
- * Use is subject to license terms.
- *
- * Copyright (c) 2012, Intel Corporation.
- */
-/*
- * This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
- *
- * libcfs/include/libcfs/libcfs_workitem.h
- *
- * Author: Isaac Huang  <he.h.huang@oracle.com>
- *	 Liang Zhen   <zhen.liang@sun.com>
- *
- * A workitems is deferred work with these semantics:
- * - a workitem always runs in thread context.
- * - a workitem can be concurrent with other workitems but is strictly
- *   serialized with respect to itself.
- * - no CPU affinity, a workitem does not necessarily run on the same CPU
- *   that schedules it. However, this might change in the future.
- * - if a workitem is scheduled again before it has a chance to run, it
- *   runs only once.
- * - if a workitem is scheduled while it runs, it runs again after it
- *   completes; this ensures that events occurring while other events are
- *   being processed receive due attention. This behavior also allows a
- *   workitem to reschedule itself.
- *
- * Usage notes:
- * - a workitem can sleep but it should be aware of how that sleep might
- *   affect others.
- * - a workitem runs inside a kernel thread so there's no user space to access.
- * - do not use a workitem if the scheduling latency can't be tolerated.
- *
- * When wi_action returns non-zero, it means the workitem has either been
- * freed or reused and workitem scheduler won't touch it any more.
- */
-
-#ifndef __LIBCFS_WORKITEM_H__
-#define __LIBCFS_WORKITEM_H__
-
-struct cfs_wi_sched;
-
-void cfs_wi_sched_destroy(struct cfs_wi_sched *sched);
-int cfs_wi_sched_create(char *name, struct cfs_cpt_table *cptab, int cpt,
-			int nthrs, struct cfs_wi_sched **sched_pp);
-
-struct cfs_workitem;
-
-typedef int (*cfs_wi_action_t) (struct cfs_workitem *);
-struct cfs_workitem {
-	/** chain on runq or rerunq */
-	struct list_head       wi_list;
-	/** working function */
-	cfs_wi_action_t  wi_action;
-	/** in running */
-	unsigned short   wi_running:1;
-	/** scheduled */
-	unsigned short   wi_scheduled:1;
-};
-
-static inline void
-cfs_wi_init(struct cfs_workitem *wi, cfs_wi_action_t action)
-{
-	INIT_LIST_HEAD(&wi->wi_list);
-
-	wi->wi_running   = 0;
-	wi->wi_scheduled = 0;
-	wi->wi_action    = action;
-}
-
-void cfs_wi_schedule(struct cfs_wi_sched *sched, struct cfs_workitem *wi);
-int  cfs_wi_deschedule(struct cfs_wi_sched *sched, struct cfs_workitem *wi);
-void cfs_wi_exit(struct cfs_wi_sched *sched, struct cfs_workitem *wi);
-
-int  cfs_wi_startup(void);
-void cfs_wi_shutdown(void);
-
-/** # workitem scheduler loops before reschedule */
-#define CFS_WI_RESCHED    128
-
-#endif /* __LIBCFS_WORKITEM_H__ */

drivers/staging/lustre/lnet/libcfs/Makefile

@@ -15,7 +15,7 @@ libcfs-linux-objs += linux-mem.o
 libcfs-linux-objs := $(addprefix linux/,$(libcfs-linux-objs))
 
 libcfs-all-objs := debug.o fail.o module.o tracefile.o \
-		   libcfs_string.o hash.o workitem.o \
+		   libcfs_string.o hash.o \
 		   libcfs_cpu.o libcfs_mem.o libcfs_lock.o
 
 libcfs-objs := $(libcfs-linux-objs) $(libcfs-all-objs)

drivers/staging/lustre/lnet/libcfs/module.c

@@ -547,12 +547,6 @@ static int libcfs_init(void)
 		goto cleanup_cpu;
 	}
 
-	rc = cfs_wi_startup();
-	if (rc) {
-		CERROR("initialize workitem: error %d\n", rc);
-		goto cleanup_deregister;
-	}
-
 	cfs_rehash_wq = alloc_workqueue("cfs_rh", WQ_SYSFS, 4);
 	if (!cfs_rehash_wq) {
 		CERROR("Failed to start rehash workqueue.\n");
@@ -563,15 +557,13 @@ static int libcfs_init(void)
 	rc = cfs_crypto_register();
 	if (rc) {
 		CERROR("cfs_crypto_register: error %d\n", rc);
-		goto cleanup_wi;
+		goto cleanup_deregister;
 	}
 
 	lustre_insert_debugfs(lnet_table, lnet_debugfs_symlinks);
 
 	CDEBUG(D_OTHER, "portals setup OK\n");
 	return 0;
- cleanup_wi:
-	cfs_wi_shutdown();
  cleanup_deregister:
 	misc_deregister(&libcfs_dev);
 cleanup_cpu:
@@ -593,7 +585,6 @@ static void libcfs_exit(void)
 	}
 
 	cfs_crypto_unregister();
-	cfs_wi_shutdown();
 
 	misc_deregister(&libcfs_dev);