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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d 
 kernel/kernel/locking/locktorture.c
....@@ -1,23 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0+
12 /*
23  * Module-based torture test facility for locking
34  *
4
- * This program is free software; you can redistribute it and/or modify
5
- * it under the terms of the GNU General Public License as published by
6
- * the Free Software Foundation; either version 2 of the License, or
7
- * (at your option) any later version.
8
- *
9
- * This program is distributed in the hope that it will be useful,
10
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
11
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12
- * GNU General Public License for more details.
13
- *
14
- * You should have received a copy of the GNU General Public License
15
- * along with this program; if not, you can access it online at
16
- * http://www.gnu.org/licenses/gpl-2.0.html.
17
- *
185  * Copyright (C) IBM Corporation, 2014
196  *
20
- * Authors: Paul E. McKenney <paulmck@us.ibm.com>
7
+ * Authors: Paul E. McKenney <paulmck@linux.ibm.com>
218  *          Davidlohr Bueso <dave@stgolabs.net>
229  *	Based on kernel/rcu/torture.c.
2310  */
....@@ -44,7 +31,7 @@
4431 #include <linux/torture.h>
4532 
4633 MODULE_LICENSE("GPL");
47
-MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com>");
34
+MODULE_AUTHOR("Paul E. McKenney <paulmck@linux.ibm.com>");
4835 
4936 torture_param(int, nwriters_stress, -1,
5037 	     "Number of write-locking stress-test threads");
....@@ -449,8 +436,6 @@
449436 
450437 static void torture_rtmutex_boost(struct torture_random_state *trsp)
451438 {
452
-	int policy;
453
-	struct sched_param param;
454439 	const unsigned int factor = 50000; /* yes, quite arbitrary */
455440 
456441 	if (!rt_task(current)) {
....@@ -461,8 +446,7 @@
461446 		 */
462447 		if (trsp && !(torture_random(trsp) %
463448 			      (cxt.nrealwriters_stress * factor))) {
464
-			policy = SCHED_FIFO;
465
-			param.sched_priority = MAX_RT_PRIO - 1;
449
+			sched_set_fifo(current);
466450 		} else /* common case, do nothing */
467451 			return;
468452 	} else {
....@@ -475,13 +459,10 @@
475459 		 */
476460 		if (!trsp || !(torture_random(trsp) %
477461 			       (cxt.nrealwriters_stress * factor * 2))) {
478
-			policy = SCHED_NORMAL;
479
-			param.sched_priority = 0;
462
+			sched_set_normal(current, 0);
480463 		} else /* common case, do nothing */
481464 			return;
482465 	}
483
-
484
-	sched_setscheduler_nocheck(current, policy, &param);
485466 }
486467 
487468 static void torture_rtmutex_delay(struct torture_random_state *trsp)
....@@ -585,7 +566,7 @@
585566 #include <linux/percpu-rwsem.h>
586567 static struct percpu_rw_semaphore pcpu_rwsem;
587568 
588
-void torture_percpu_rwsem_init(void)
569
+static void torture_percpu_rwsem_init(void)
589570 {
590571 	BUG_ON(percpu_init_rwsem(&pcpu_rwsem));
591572 }
....@@ -631,7 +612,7 @@
631612 static int lock_torture_writer(void *arg)
632613 {
633614 	struct lock_stress_stats *lwsp = arg;
634
-	static DEFINE_TORTURE_RANDOM(rand);
615
+	DEFINE_TORTURE_RANDOM(rand);
635616 
636617 	VERBOSE_TOROUT_STRING("lock_torture_writer task started");
637618 	set_user_nice(current, MAX_NICE);
....@@ -644,13 +625,13 @@
644625 		cxt.cur_ops->writelock();
645626 		if (WARN_ON_ONCE(lock_is_write_held))
646627 			lwsp->n_lock_fail++;
647
-		lock_is_write_held = 1;
628
+		lock_is_write_held = true;
648629 		if (WARN_ON_ONCE(lock_is_read_held))
649630 			lwsp->n_lock_fail++; /* rare, but... */
650631 
651632 		lwsp->n_lock_acquired++;
652633 		cxt.cur_ops->write_delay(&rand);
653
-		lock_is_write_held = 0;
634
+		lock_is_write_held = false;
654635 		cxt.cur_ops->writeunlock();
655636 
656637 		stutter_wait("lock_torture_writer");
....@@ -668,7 +649,7 @@
668649 static int lock_torture_reader(void *arg)
669650 {
670651 	struct lock_stress_stats *lrsp = arg;
671
-	static DEFINE_TORTURE_RANDOM(rand);
652
+	DEFINE_TORTURE_RANDOM(rand);
672653 
673654 	VERBOSE_TOROUT_STRING("lock_torture_reader task started");
674655 	set_user_nice(current, MAX_NICE);
....@@ -678,13 +659,13 @@
678659 			schedule_timeout_uninterruptible(1);
679660 
680661 		cxt.cur_ops->readlock();
681
-		lock_is_read_held = 1;
662
+		lock_is_read_held = true;
682663 		if (WARN_ON_ONCE(lock_is_write_held))
683664 			lrsp->n_lock_fail++; /* rare, but... */
684665 
685666 		lrsp->n_lock_acquired++;
686667 		cxt.cur_ops->read_delay(&rand);
687
-		lock_is_read_held = 0;
668
+		lock_is_read_held = false;
688669 		cxt.cur_ops->readunlock();
689670 
690671 		stutter_wait("lock_torture_reader");
....@@ -699,7 +680,7 @@
699680 static void __torture_print_stats(char *page,
700681 				  struct lock_stress_stats *statp, bool write)
701682 {
702
-	bool fail = 0;
683
+	bool fail = false;
703684 	int i, n_stress;
704685 	long max = 0, min = statp ? statp[0].n_lock_acquired : 0;
705686 	long long sum = 0;
....@@ -717,7 +698,8 @@
717698 	page += sprintf(page,
718699 			"%s:  Total: %lld  Max/Min: %ld/%ld %s  Fail: %d %s\n",
719700 			write ? "Writes" : "Reads ",
720
-			sum, max, min, max / 2 > min ? "???" : "",
701
+			sum, max, min,
702
+			!onoff_interval && max / 2 > min ? "???" : "",
721703 			fail, fail ? "!!!" : "");
722704 	if (fail)
723705 		atomic_inc(&cxt.n_lock_torture_errors);
....@@ -841,7 +823,9 @@
841823 						"End of test: SUCCESS");
842824 
843825 	kfree(cxt.lwsa);
826
+	cxt.lwsa = NULL;
844827 	kfree(cxt.lrsa);
828
+	cxt.lrsa = NULL;
845829 
846830 end:
847831 	torture_cleanup_end();
....@@ -899,22 +883,22 @@
899883 		cxt.nrealwriters_stress = 2 * num_online_cpus();
900884 
901885 #ifdef CONFIG_DEBUG_MUTEXES
902
-	if (strncmp(torture_type, "mutex", 5) == 0)
886
+	if (str_has_prefix(torture_type, "mutex"))
903887 		cxt.debug_lock = true;
904888 #endif
905889 #ifdef CONFIG_DEBUG_RT_MUTEXES
906
-	if (strncmp(torture_type, "rtmutex", 7) == 0)
890
+	if (str_has_prefix(torture_type, "rtmutex"))
907891 		cxt.debug_lock = true;
908892 #endif
909893 #ifdef CONFIG_DEBUG_SPINLOCK
910
-	if ((strncmp(torture_type, "spin", 4) == 0) ||
911
-	    (strncmp(torture_type, "rw_lock", 7) == 0))
894
+	if ((str_has_prefix(torture_type, "spin")) ||
895
+	    (str_has_prefix(torture_type, "rw_lock")))
912896 		cxt.debug_lock = true;
913897 #endif
914898 
915899 	/* Initialize the statistics so that each run gets its own numbers. */
916900 	if (nwriters_stress) {
917
-		lock_is_write_held = 0;
901
+		lock_is_write_held = false;
918902 		cxt.lwsa = kmalloc_array(cxt.nrealwriters_stress,
919903 					 sizeof(*cxt.lwsa),
920904 					 GFP_KERNEL);
....@@ -945,7 +929,7 @@
945929 		}
946930 
947931 		if (nreaders_stress) {
948
-			lock_is_read_held = 0;
932
+			lock_is_read_held = false;
949933 			cxt.lrsa = kmalloc_array(cxt.nrealreaders_stress,
950934 						 sizeof(*cxt.lrsa),
951935 						 GFP_KERNEL);
....@@ -969,7 +953,7 @@
969953 	/* Prepare torture context. */
970954 	if (onoff_interval > 0) {
971955 		firsterr = torture_onoff_init(onoff_holdoff * HZ,
972
-					      onoff_interval * HZ);
956
+					      onoff_interval * HZ, NULL);
973957 		if (firsterr)
974958 			goto unwind;
975959 	}
....@@ -985,7 +969,7 @@
985969 			goto unwind;
986970 	}
987971 	if (stutter > 0) {
988
-		firsterr = torture_stutter_init(stutter);
972
+		firsterr = torture_stutter_init(stutter, stutter);
989973 		if (firsterr)
990974 			goto unwind;
991975 	}