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2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d 
 kernel/kernel/latencytop.c
....@@ -1,13 +1,9 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * latencytop.c: Latency display infrastructure
34  *
45  * (C) Copyright 2008 Intel Corporation
56  * Author: Arjan van de Ven <arjan@linux.intel.com>
6
- *
7
- * This program is free software; you can redistribute it and/or
8
- * modify it under the terms of the GNU General Public License
9
- * as published by the Free Software Foundation; version 2
10
- * of the License.
117  */
128 
139 /*
....@@ -67,12 +63,9 @@
6763 
6864 int latencytop_enabled;
6965 
70
-void clear_all_latency_tracing(struct task_struct *p)
66
+void clear_tsk_latency_tracing(struct task_struct *p)
7167 {
7268 	unsigned long flags;
73
-
74
-	if (!latencytop_enabled)
75
-		return;
7669 
7770 	raw_spin_lock_irqsave(&latency_lock, flags);
7871 	memset(&p->latency_record, 0, sizeof(p->latency_record));
....@@ -96,9 +89,6 @@
9689 	int firstnonnull = MAXLR + 1;
9790 	int i;
9891 
99
-	if (!latencytop_enabled)
100
-		return;
101
-
10292 	/* skip kernel threads for now */
10393 	if (!tsk->mm)
10494 		return;
....@@ -120,8 +110,8 @@
120110 				break;
121111 			}
122112 
123
-			/* 0 and ULONG_MAX entries mean end of backtrace: */
124
-			if (record == 0 || record == ULONG_MAX)
113
+			/* 0 entry marks end of backtrace: */
114
+			if (!record)
125115 				break;
126116 		}
127117 		if (same) {
....@@ -139,20 +129,6 @@
139129 
140130 	/* Allocted a new one: */
141131 	memcpy(&latency_record[i], lat, sizeof(struct latency_record));
142
-}
143
-
144
-/*
145
- * Iterator to store a backtrace into a latency record entry
146
- */
147
-static inline void store_stacktrace(struct task_struct *tsk,
148
-					struct latency_record *lat)
149
-{
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-	struct stack_trace trace;
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-
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-	memset(&trace, 0, sizeof(trace));
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-	trace.max_entries = LT_BACKTRACEDEPTH;
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-	trace.entries = &lat->backtrace[0];
155
-	save_stack_trace_tsk(tsk, &trace);
156132 }
157133 
158134 /**
....@@ -191,7 +167,8 @@
191167 	lat.count = 1;
192168 	lat.time = usecs;
193169 	lat.max = usecs;
194
-	store_stacktrace(tsk, &lat);
170
+
171
+	stack_trace_save_tsk(tsk, lat.backtrace, LT_BACKTRACEDEPTH, 0);
195172 
196173 	raw_spin_lock_irqsave(&latency_lock, flags);
197174 
....@@ -210,8 +187,8 @@
210187 				break;
211188 			}
212189 
213
-			/* 0 and ULONG_MAX entries mean end of backtrace: */
214
-			if (record == 0 || record == ULONG_MAX)
190
+			/* 0 entry is end of backtrace */
191
+			if (!record)
215192 				break;
216193 		}
217194 		if (same) {
....@@ -252,10 +229,10 @@
252229 				   lr->count, lr->time, lr->max);
253230 			for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
254231 				unsigned long bt = lr->backtrace[q];
232
+
255233 				if (!bt)
256234 					break;
257
-				if (bt == ULONG_MAX)
258
-					break;
235
+
259236 				seq_printf(m, " %ps", (void *)bt);
260237 			}
261238 			seq_puts(m, "\n");
....@@ -278,22 +255,22 @@
278255 	return single_open(filp, lstats_show, NULL);
279256 }
280257 
281
-static const struct file_operations lstats_fops = {
282
-	.open		= lstats_open,
283
-	.read		= seq_read,
284
-	.write		= lstats_write,
285
-	.llseek		= seq_lseek,
286
-	.release	= single_release,
258
+static const struct proc_ops lstats_proc_ops = {
259
+	.proc_open	= lstats_open,
260
+	.proc_read	= seq_read,
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+	.proc_write	= lstats_write,
262
+	.proc_lseek	= seq_lseek,
263
+	.proc_release	= single_release,
287264 };
288265 
289266 static int __init init_lstats_procfs(void)
290267 {
291
-	proc_create("latency_stats", 0644, NULL, &lstats_fops);
268
+	proc_create("latency_stats", 0644, NULL, &lstats_proc_ops);
292269 	return 0;
293270 }
294271 
295
-int sysctl_latencytop(struct ctl_table *table, int write,
296
-			void __user *buffer, size_t *lenp, loff_t *ppos)
272
+int sysctl_latencytop(struct ctl_table *table, int write, void *buffer,
273
+		size_t *lenp, loff_t *ppos)
297274 {
298275 	int err;
299276