1 // SPDX-License-Identifier: GPL-2.0 <<
2 /* 1 /*
3 * trace irqs off critical timings 2 * trace irqs off critical timings
4 * 3 *
5 * Copyright (C) 2007-2008 Steven Rostedt <sro 4 * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
6 * Copyright (C) 2008 Ingo Molnar <mingo@redha 5 * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
7 * 6 *
8 * From code in the latency_tracer, that is: 7 * From code in the latency_tracer, that is:
9 * 8 *
10 * Copyright (C) 2004-2006 Ingo Molnar 9 * Copyright (C) 2004-2006 Ingo Molnar
11 * Copyright (C) 2004 Nadia Yvette Chambers 10 * Copyright (C) 2004 Nadia Yvette Chambers
12 */ 11 */
13 #include <linux/kallsyms.h> 12 #include <linux/kallsyms.h>
14 #include <linux/uaccess.h> 13 #include <linux/uaccess.h>
15 #include <linux/module.h> 14 #include <linux/module.h>
16 #include <linux/ftrace.h> 15 #include <linux/ftrace.h>
17 #include <linux/kprobes.h> <<
18 16
19 #include "trace.h" 17 #include "trace.h"
20 18
>> 19 #define CREATE_TRACE_POINTS
21 #include <trace/events/preemptirq.h> 20 #include <trace/events/preemptirq.h>
22 21
23 #if defined(CONFIG_IRQSOFF_TRACER) || defined( 22 #if defined(CONFIG_IRQSOFF_TRACER) || defined(CONFIG_PREEMPT_TRACER)
24 static struct trace_array *irqso 23 static struct trace_array *irqsoff_trace __read_mostly;
25 static int tracer 24 static int tracer_enabled __read_mostly;
26 25
27 static DEFINE_PER_CPU(int, tracing_cpu); 26 static DEFINE_PER_CPU(int, tracing_cpu);
28 27
29 static DEFINE_RAW_SPINLOCK(max_trace_lock); 28 static DEFINE_RAW_SPINLOCK(max_trace_lock);
30 29
31 enum { 30 enum {
32 TRACER_IRQS_OFF = (1 << 1), 31 TRACER_IRQS_OFF = (1 << 1),
33 TRACER_PREEMPT_OFF = (1 << 2), 32 TRACER_PREEMPT_OFF = (1 << 2),
34 }; 33 };
35 34
36 static int trace_type __read_mostly; 35 static int trace_type __read_mostly;
37 36
38 static int save_flags; 37 static int save_flags;
39 38
40 static void stop_irqsoff_tracer(struct trace_a 39 static void stop_irqsoff_tracer(struct trace_array *tr, int graph);
41 static int start_irqsoff_tracer(struct trace_a 40 static int start_irqsoff_tracer(struct trace_array *tr, int graph);
42 41
43 #ifdef CONFIG_PREEMPT_TRACER 42 #ifdef CONFIG_PREEMPT_TRACER
44 static inline int 43 static inline int
45 preempt_trace(int pc) !! 44 preempt_trace(void)
46 { 45 {
47 return ((trace_type & TRACER_PREEMPT_O !! 46 return ((trace_type & TRACER_PREEMPT_OFF) && preempt_count());
48 } 47 }
49 #else 48 #else
50 # define preempt_trace(pc) (0) !! 49 # define preempt_trace() (0)
51 #endif 50 #endif
52 51
53 #ifdef CONFIG_IRQSOFF_TRACER 52 #ifdef CONFIG_IRQSOFF_TRACER
54 static inline int 53 static inline int
55 irq_trace(void) 54 irq_trace(void)
56 { 55 {
57 return ((trace_type & TRACER_IRQS_OFF) 56 return ((trace_type & TRACER_IRQS_OFF) &&
58 irqs_disabled()); 57 irqs_disabled());
59 } 58 }
60 #else 59 #else
61 # define irq_trace() (0) 60 # define irq_trace() (0)
62 #endif 61 #endif
63 62
64 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 63 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
65 static int irqsoff_display_graph(struct trace_ 64 static int irqsoff_display_graph(struct trace_array *tr, int set);
66 # define is_graph(tr) ((tr)->trace_flags & TRA 65 # define is_graph(tr) ((tr)->trace_flags & TRACE_ITER_DISPLAY_GRAPH)
67 #else 66 #else
68 static inline int irqsoff_display_graph(struct 67 static inline int irqsoff_display_graph(struct trace_array *tr, int set)
69 { 68 {
70 return -EINVAL; 69 return -EINVAL;
71 } 70 }
72 # define is_graph(tr) false 71 # define is_graph(tr) false
73 #endif 72 #endif
74 73
75 /* 74 /*
76 * Sequence count - we record it when starting 75 * Sequence count - we record it when starting a measurement and
77 * skip the latency if the sequence has change 76 * skip the latency if the sequence has changed - some other section
78 * did a maximum and could disturb our measure 77 * did a maximum and could disturb our measurement with serial console
79 * printouts, etc. Truly coinciding maximum la 78 * printouts, etc. Truly coinciding maximum latencies should be rare
80 * and what happens together happens separatel 79 * and what happens together happens separately as well, so this doesn't
81 * decrease the validity of the maximum found: 80 * decrease the validity of the maximum found:
82 */ 81 */
83 static __cacheline_aligned_in_smp unsign 82 static __cacheline_aligned_in_smp unsigned long max_sequence;
84 83
85 #ifdef CONFIG_FUNCTION_TRACER 84 #ifdef CONFIG_FUNCTION_TRACER
86 /* 85 /*
87 * Prologue for the preempt and irqs off funct 86 * Prologue for the preempt and irqs off function tracers.
88 * 87 *
89 * Returns 1 if it is OK to continue, and data 88 * Returns 1 if it is OK to continue, and data->disabled is
90 * incremented. 89 * incremented.
91 * 0 if the trace is to be ignored, an 90 * 0 if the trace is to be ignored, and data->disabled
92 * is kept the same. 91 * is kept the same.
93 * 92 *
94 * Note, this function is also used outside th 93 * Note, this function is also used outside this ifdef but
95 * inside the #ifdef of the function graph tr 94 * inside the #ifdef of the function graph tracer below.
96 * This is OK, since the function graph trace 95 * This is OK, since the function graph tracer is
97 * dependent on the function tracer. 96 * dependent on the function tracer.
98 */ 97 */
99 static int func_prolog_dec(struct trace_array 98 static int func_prolog_dec(struct trace_array *tr,
100 struct trace_array_ 99 struct trace_array_cpu **data,
101 unsigned long *flag 100 unsigned long *flags)
102 { 101 {
103 long disabled; 102 long disabled;
104 int cpu; 103 int cpu;
105 104
106 /* 105 /*
107 * Does not matter if we preempt. We t 106 * Does not matter if we preempt. We test the flags
108 * afterward, to see if irqs are disab 107 * afterward, to see if irqs are disabled or not.
109 * If we preempt and get a false posit 108 * If we preempt and get a false positive, the flags
110 * test will fail. 109 * test will fail.
111 */ 110 */
112 cpu = raw_smp_processor_id(); 111 cpu = raw_smp_processor_id();
113 if (likely(!per_cpu(tracing_cpu, cpu)) 112 if (likely(!per_cpu(tracing_cpu, cpu)))
114 return 0; 113 return 0;
115 114
116 local_save_flags(*flags); 115 local_save_flags(*flags);
117 /* 116 /*
118 * Slight chance to get a false positi 117 * Slight chance to get a false positive on tracing_cpu,
119 * although I'm starting to think ther 118 * although I'm starting to think there isn't a chance.
120 * Leave this for now just to be paran 119 * Leave this for now just to be paranoid.
121 */ 120 */
122 if (!irqs_disabled_flags(*flags) && !p 121 if (!irqs_disabled_flags(*flags) && !preempt_count())
123 return 0; 122 return 0;
124 123
125 *data = per_cpu_ptr(tr->array_buffer.d !! 124 *data = per_cpu_ptr(tr->trace_buffer.data, cpu);
126 disabled = atomic_inc_return(&(*data)- 125 disabled = atomic_inc_return(&(*data)->disabled);
127 126
128 if (likely(disabled == 1)) 127 if (likely(disabled == 1))
129 return 1; 128 return 1;
130 129
131 atomic_dec(&(*data)->disabled); 130 atomic_dec(&(*data)->disabled);
132 131
133 return 0; 132 return 0;
134 } 133 }
135 134
136 /* 135 /*
137 * irqsoff uses its own tracer function to kee 136 * irqsoff uses its own tracer function to keep the overhead down:
138 */ 137 */
139 static void 138 static void
140 irqsoff_tracer_call(unsigned long ip, unsigned 139 irqsoff_tracer_call(unsigned long ip, unsigned long parent_ip,
141 struct ftrace_ops *op, str !! 140 struct ftrace_ops *op, struct pt_regs *pt_regs)
142 { 141 {
143 struct trace_array *tr = irqsoff_trace 142 struct trace_array *tr = irqsoff_trace;
144 struct trace_array_cpu *data; 143 struct trace_array_cpu *data;
145 unsigned long flags; 144 unsigned long flags;
146 unsigned int trace_ctx; <<
147 145
148 if (!func_prolog_dec(tr, &data, &flags 146 if (!func_prolog_dec(tr, &data, &flags))
149 return; 147 return;
150 148
151 trace_ctx = tracing_gen_ctx_flags(flag !! 149 trace_function(tr, ip, parent_ip, flags, preempt_count());
152 <<
153 trace_function(tr, ip, parent_ip, trac <<
154 150
155 atomic_dec(&data->disabled); 151 atomic_dec(&data->disabled);
156 } 152 }
157 #endif /* CONFIG_FUNCTION_TRACER */ 153 #endif /* CONFIG_FUNCTION_TRACER */
158 154
159 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 155 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
160 static int irqsoff_display_graph(struct trace_ 156 static int irqsoff_display_graph(struct trace_array *tr, int set)
161 { 157 {
162 int cpu; 158 int cpu;
163 159
164 if (!(is_graph(tr) ^ set)) 160 if (!(is_graph(tr) ^ set))
165 return 0; 161 return 0;
166 162
167 stop_irqsoff_tracer(irqsoff_trace, !se 163 stop_irqsoff_tracer(irqsoff_trace, !set);
168 164
169 for_each_possible_cpu(cpu) 165 for_each_possible_cpu(cpu)
170 per_cpu(tracing_cpu, cpu) = 0; 166 per_cpu(tracing_cpu, cpu) = 0;
171 167
172 tr->max_latency = 0; 168 tr->max_latency = 0;
173 tracing_reset_online_cpus(&irqsoff_tra !! 169 tracing_reset_online_cpus(&irqsoff_trace->trace_buffer);
174 170
175 return start_irqsoff_tracer(irqsoff_tr 171 return start_irqsoff_tracer(irqsoff_trace, set);
176 } 172 }
177 173
178 static int irqsoff_graph_entry(struct ftrace_g !! 174 static int irqsoff_graph_entry(struct ftrace_graph_ent *trace)
179 struct fgraph_o <<
180 { 175 {
181 struct trace_array *tr = irqsoff_trace 176 struct trace_array *tr = irqsoff_trace;
182 struct trace_array_cpu *data; 177 struct trace_array_cpu *data;
183 unsigned long flags; 178 unsigned long flags;
184 unsigned int trace_ctx; <<
185 int ret; 179 int ret;
>> 180 int pc;
186 181
187 if (ftrace_graph_ignore_func(gops, tra !! 182 if (ftrace_graph_ignore_func(trace))
188 return 0; 183 return 0;
189 /* 184 /*
190 * Do not trace a function if it's fil 185 * Do not trace a function if it's filtered by set_graph_notrace.
191 * Make the index of ret stack negativ 186 * Make the index of ret stack negative to indicate that it should
192 * ignore further functions. But it n 187 * ignore further functions. But it needs its own ret stack entry
193 * to recover the original index in or 188 * to recover the original index in order to continue tracing after
194 * returning from the function. 189 * returning from the function.
195 */ 190 */
196 if (ftrace_graph_notrace_addr(trace->f 191 if (ftrace_graph_notrace_addr(trace->func))
197 return 1; 192 return 1;
198 193
199 if (!func_prolog_dec(tr, &data, &flags 194 if (!func_prolog_dec(tr, &data, &flags))
200 return 0; 195 return 0;
201 196
202 trace_ctx = tracing_gen_ctx_flags(flag !! 197 pc = preempt_count();
203 ret = __trace_graph_entry(tr, trace, t !! 198 ret = __trace_graph_entry(tr, trace, flags, pc);
204 atomic_dec(&data->disabled); 199 atomic_dec(&data->disabled);
205 200
206 return ret; 201 return ret;
207 } 202 }
208 203
209 static void irqsoff_graph_return(struct ftrace !! 204 static void irqsoff_graph_return(struct ftrace_graph_ret *trace)
210 struct fgraph <<
211 { 205 {
212 struct trace_array *tr = irqsoff_trace 206 struct trace_array *tr = irqsoff_trace;
213 struct trace_array_cpu *data; 207 struct trace_array_cpu *data;
214 unsigned long flags; 208 unsigned long flags;
215 unsigned int trace_ctx; !! 209 int pc;
216 <<
217 ftrace_graph_addr_finish(gops, trace); <<
218 210
219 if (!func_prolog_dec(tr, &data, &flags 211 if (!func_prolog_dec(tr, &data, &flags))
220 return; 212 return;
221 213
222 trace_ctx = tracing_gen_ctx_flags(flag !! 214 pc = preempt_count();
223 __trace_graph_return(tr, trace, trace_ !! 215 __trace_graph_return(tr, trace, flags, pc);
224 atomic_dec(&data->disabled); 216 atomic_dec(&data->disabled);
225 } 217 }
226 218
227 static struct fgraph_ops fgraph_ops = { <<
228 .entryfunc = &irqsoff_gra <<
229 .retfunc = &irqsoff_gra <<
230 }; <<
231 <<
232 static void irqsoff_trace_open(struct trace_it 219 static void irqsoff_trace_open(struct trace_iterator *iter)
233 { 220 {
234 if (is_graph(iter->tr)) 221 if (is_graph(iter->tr))
235 graph_trace_open(iter); 222 graph_trace_open(iter);
236 else !! 223
237 iter->private = NULL; <<
238 } 224 }
239 225
240 static void irqsoff_trace_close(struct trace_i 226 static void irqsoff_trace_close(struct trace_iterator *iter)
241 { 227 {
242 if (iter->private) 228 if (iter->private)
243 graph_trace_close(iter); 229 graph_trace_close(iter);
244 } 230 }
245 231
246 #define GRAPH_TRACER_FLAGS (TRACE_GRAPH_PRINT_ 232 #define GRAPH_TRACER_FLAGS (TRACE_GRAPH_PRINT_CPU | \
247 TRACE_GRAPH_PRINT_ 233 TRACE_GRAPH_PRINT_PROC | \
248 TRACE_GRAPH_PRINT_ !! 234 TRACE_GRAPH_PRINT_ABS_TIME | \
249 TRACE_GRAPH_PRINT_ 235 TRACE_GRAPH_PRINT_DURATION)
250 236
251 static enum print_line_t irqsoff_print_line(st 237 static enum print_line_t irqsoff_print_line(struct trace_iterator *iter)
252 { 238 {
253 /* 239 /*
254 * In graph mode call the graph tracer 240 * In graph mode call the graph tracer output function,
255 * otherwise go with the TRACE_FN even 241 * otherwise go with the TRACE_FN event handler
256 */ 242 */
257 if (is_graph(iter->tr)) 243 if (is_graph(iter->tr))
258 return print_graph_function_fl 244 return print_graph_function_flags(iter, GRAPH_TRACER_FLAGS);
259 245
260 return TRACE_TYPE_UNHANDLED; 246 return TRACE_TYPE_UNHANDLED;
261 } 247 }
262 248
263 static void irqsoff_print_header(struct seq_fi 249 static void irqsoff_print_header(struct seq_file *s)
264 { 250 {
265 struct trace_array *tr = irqsoff_trace 251 struct trace_array *tr = irqsoff_trace;
266 252
267 if (is_graph(tr)) 253 if (is_graph(tr))
268 print_graph_headers_flags(s, G 254 print_graph_headers_flags(s, GRAPH_TRACER_FLAGS);
269 else 255 else
270 trace_default_header(s); 256 trace_default_header(s);
271 } 257 }
272 258
273 static void 259 static void
274 __trace_function(struct trace_array *tr, 260 __trace_function(struct trace_array *tr,
275 unsigned long ip, unsigned lo 261 unsigned long ip, unsigned long parent_ip,
276 unsigned int trace_ctx) !! 262 unsigned long flags, int pc)
277 { 263 {
278 if (is_graph(tr)) 264 if (is_graph(tr))
279 trace_graph_function(tr, ip, p !! 265 trace_graph_function(tr, ip, parent_ip, flags, pc);
280 else 266 else
281 trace_function(tr, ip, parent_ !! 267 trace_function(tr, ip, parent_ip, flags, pc);
282 } 268 }
283 269
284 #else 270 #else
285 #define __trace_function trace_function 271 #define __trace_function trace_function
286 272
>> 273 #ifdef CONFIG_FUNCTION_TRACER
>> 274 static int irqsoff_graph_entry(struct ftrace_graph_ent *trace)
>> 275 {
>> 276 return -1;
>> 277 }
>> 278 #endif
>> 279
287 static enum print_line_t irqsoff_print_line(st 280 static enum print_line_t irqsoff_print_line(struct trace_iterator *iter)
288 { 281 {
289 return TRACE_TYPE_UNHANDLED; 282 return TRACE_TYPE_UNHANDLED;
290 } 283 }
291 284
292 static void irqsoff_trace_open(struct trace_it 285 static void irqsoff_trace_open(struct trace_iterator *iter) { }
293 static void irqsoff_trace_close(struct trace_i 286 static void irqsoff_trace_close(struct trace_iterator *iter) { }
294 287
295 #ifdef CONFIG_FUNCTION_TRACER 288 #ifdef CONFIG_FUNCTION_TRACER
>> 289 static void irqsoff_graph_return(struct ftrace_graph_ret *trace) { }
296 static void irqsoff_print_header(struct seq_fi 290 static void irqsoff_print_header(struct seq_file *s)
297 { 291 {
298 trace_default_header(s); 292 trace_default_header(s);
299 } 293 }
300 #else 294 #else
301 static void irqsoff_print_header(struct seq_fi 295 static void irqsoff_print_header(struct seq_file *s)
302 { 296 {
303 trace_latency_header(s); 297 trace_latency_header(s);
304 } 298 }
305 #endif /* CONFIG_FUNCTION_TRACER */ 299 #endif /* CONFIG_FUNCTION_TRACER */
306 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 300 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
307 301
308 /* 302 /*
309 * Should this new latency be reported/recorde 303 * Should this new latency be reported/recorded?
310 */ 304 */
311 static bool report_latency(struct trace_array 305 static bool report_latency(struct trace_array *tr, u64 delta)
312 { 306 {
313 if (tracing_thresh) { 307 if (tracing_thresh) {
314 if (delta < tracing_thresh) 308 if (delta < tracing_thresh)
315 return false; 309 return false;
316 } else { 310 } else {
317 if (delta <= tr->max_latency) 311 if (delta <= tr->max_latency)
318 return false; 312 return false;
319 } 313 }
320 return true; 314 return true;
321 } 315 }
322 316
323 static void 317 static void
324 check_critical_timing(struct trace_array *tr, 318 check_critical_timing(struct trace_array *tr,
325 struct trace_array_cpu * 319 struct trace_array_cpu *data,
326 unsigned long parent_ip, 320 unsigned long parent_ip,
327 int cpu) 321 int cpu)
328 { 322 {
329 u64 T0, T1, delta; 323 u64 T0, T1, delta;
330 unsigned long flags; 324 unsigned long flags;
331 unsigned int trace_ctx; !! 325 int pc;
332 326
333 T0 = data->preempt_timestamp; 327 T0 = data->preempt_timestamp;
334 T1 = ftrace_now(cpu); 328 T1 = ftrace_now(cpu);
335 delta = T1-T0; 329 delta = T1-T0;
336 330
337 trace_ctx = tracing_gen_ctx(); !! 331 local_save_flags(flags);
>> 332
>> 333 pc = preempt_count();
338 334
339 if (!report_latency(tr, delta)) 335 if (!report_latency(tr, delta))
340 goto out; 336 goto out;
341 337
342 raw_spin_lock_irqsave(&max_trace_lock, 338 raw_spin_lock_irqsave(&max_trace_lock, flags);
343 339
344 /* check if we are still the max laten 340 /* check if we are still the max latency */
345 if (!report_latency(tr, delta)) 341 if (!report_latency(tr, delta))
346 goto out_unlock; 342 goto out_unlock;
347 343
348 __trace_function(tr, CALLER_ADDR0, par !! 344 __trace_function(tr, CALLER_ADDR0, parent_ip, flags, pc);
349 /* Skip 5 functions to get to the irq/ 345 /* Skip 5 functions to get to the irq/preempt enable function */
350 __trace_stack(tr, trace_ctx, 5); !! 346 __trace_stack(tr, flags, 5, pc);
351 347
352 if (data->critical_sequence != max_seq 348 if (data->critical_sequence != max_sequence)
353 goto out_unlock; 349 goto out_unlock;
354 350
355 data->critical_end = parent_ip; 351 data->critical_end = parent_ip;
356 352
357 if (likely(!is_tracing_stopped())) { 353 if (likely(!is_tracing_stopped())) {
358 tr->max_latency = delta; 354 tr->max_latency = delta;
359 update_max_tr_single(tr, curre 355 update_max_tr_single(tr, current, cpu);
360 } 356 }
361 357
362 max_sequence++; 358 max_sequence++;
363 359
364 out_unlock: 360 out_unlock:
365 raw_spin_unlock_irqrestore(&max_trace_ 361 raw_spin_unlock_irqrestore(&max_trace_lock, flags);
366 362
367 out: 363 out:
368 data->critical_sequence = max_sequence 364 data->critical_sequence = max_sequence;
369 data->preempt_timestamp = ftrace_now(c 365 data->preempt_timestamp = ftrace_now(cpu);
370 __trace_function(tr, CALLER_ADDR0, par !! 366 __trace_function(tr, CALLER_ADDR0, parent_ip, flags, pc);
371 } 367 }
372 368
373 static nokprobe_inline void !! 369 static inline void
374 start_critical_timing(unsigned long ip, unsign 370 start_critical_timing(unsigned long ip, unsigned long parent_ip)
375 { 371 {
376 int cpu; 372 int cpu;
377 struct trace_array *tr = irqsoff_trace 373 struct trace_array *tr = irqsoff_trace;
378 struct trace_array_cpu *data; 374 struct trace_array_cpu *data;
>> 375 unsigned long flags;
379 376
380 if (!tracer_enabled || !tracing_is_ena 377 if (!tracer_enabled || !tracing_is_enabled())
381 return; 378 return;
382 379
383 cpu = raw_smp_processor_id(); 380 cpu = raw_smp_processor_id();
384 381
385 if (per_cpu(tracing_cpu, cpu)) 382 if (per_cpu(tracing_cpu, cpu))
386 return; 383 return;
387 384
388 data = per_cpu_ptr(tr->array_buffer.da !! 385 data = per_cpu_ptr(tr->trace_buffer.data, cpu);
389 386
390 if (unlikely(!data) || atomic_read(&da 387 if (unlikely(!data) || atomic_read(&data->disabled))
391 return; 388 return;
392 389
393 atomic_inc(&data->disabled); 390 atomic_inc(&data->disabled);
394 391
395 data->critical_sequence = max_sequence 392 data->critical_sequence = max_sequence;
396 data->preempt_timestamp = ftrace_now(c 393 data->preempt_timestamp = ftrace_now(cpu);
397 data->critical_start = parent_ip ? : i 394 data->critical_start = parent_ip ? : ip;
398 395
399 __trace_function(tr, ip, parent_ip, tr !! 396 local_save_flags(flags);
>> 397
>> 398 __trace_function(tr, ip, parent_ip, flags, preempt_count());
400 399
401 per_cpu(tracing_cpu, cpu) = 1; 400 per_cpu(tracing_cpu, cpu) = 1;
402 401
403 atomic_dec(&data->disabled); 402 atomic_dec(&data->disabled);
404 } 403 }
405 404
406 static nokprobe_inline void !! 405 static inline void
407 stop_critical_timing(unsigned long ip, unsigne 406 stop_critical_timing(unsigned long ip, unsigned long parent_ip)
408 { 407 {
409 int cpu; 408 int cpu;
410 struct trace_array *tr = irqsoff_trace 409 struct trace_array *tr = irqsoff_trace;
411 struct trace_array_cpu *data; 410 struct trace_array_cpu *data;
412 unsigned int trace_ctx; !! 411 unsigned long flags;
413 412
414 cpu = raw_smp_processor_id(); 413 cpu = raw_smp_processor_id();
415 /* Always clear the tracing cpu on sto 414 /* Always clear the tracing cpu on stopping the trace */
416 if (unlikely(per_cpu(tracing_cpu, cpu) 415 if (unlikely(per_cpu(tracing_cpu, cpu)))
417 per_cpu(tracing_cpu, cpu) = 0; 416 per_cpu(tracing_cpu, cpu) = 0;
418 else 417 else
419 return; 418 return;
420 419
421 if (!tracer_enabled || !tracing_is_ena 420 if (!tracer_enabled || !tracing_is_enabled())
422 return; 421 return;
423 422
424 data = per_cpu_ptr(tr->array_buffer.da !! 423 data = per_cpu_ptr(tr->trace_buffer.data, cpu);
425 424
426 if (unlikely(!data) || 425 if (unlikely(!data) ||
427 !data->critical_start || atomic_re 426 !data->critical_start || atomic_read(&data->disabled))
428 return; 427 return;
429 428
430 atomic_inc(&data->disabled); 429 atomic_inc(&data->disabled);
431 430
432 trace_ctx = tracing_gen_ctx(); !! 431 local_save_flags(flags);
433 __trace_function(tr, ip, parent_ip, tr !! 432 __trace_function(tr, ip, parent_ip, flags, preempt_count());
434 check_critical_timing(tr, data, parent 433 check_critical_timing(tr, data, parent_ip ? : ip, cpu);
435 data->critical_start = 0; 434 data->critical_start = 0;
436 atomic_dec(&data->disabled); 435 atomic_dec(&data->disabled);
437 } 436 }
438 437
439 /* start and stop critical timings used to for 438 /* start and stop critical timings used to for stoppage (in idle) */
440 void start_critical_timings(void) 439 void start_critical_timings(void)
441 { 440 {
442 if (preempt_trace(preempt_count()) || !! 441 if (preempt_trace() || irq_trace())
443 start_critical_timing(CALLER_A 442 start_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
444 } 443 }
445 EXPORT_SYMBOL_GPL(start_critical_timings); 444 EXPORT_SYMBOL_GPL(start_critical_timings);
446 NOKPROBE_SYMBOL(start_critical_timings); <<
447 445
448 void stop_critical_timings(void) 446 void stop_critical_timings(void)
449 { 447 {
450 if (preempt_trace(preempt_count()) || !! 448 if (preempt_trace() || irq_trace())
451 stop_critical_timing(CALLER_AD 449 stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
452 } 450 }
453 EXPORT_SYMBOL_GPL(stop_critical_timings); 451 EXPORT_SYMBOL_GPL(stop_critical_timings);
454 NOKPROBE_SYMBOL(stop_critical_timings); !! 452
>> 453 #ifdef CONFIG_IRQSOFF_TRACER
>> 454 #ifdef CONFIG_PROVE_LOCKING
>> 455 void time_hardirqs_on(unsigned long a0, unsigned long a1)
>> 456 {
>> 457 if (!preempt_trace() && irq_trace())
>> 458 stop_critical_timing(a0, a1);
>> 459 }
>> 460
>> 461 void time_hardirqs_off(unsigned long a0, unsigned long a1)
>> 462 {
>> 463 if (!preempt_trace() && irq_trace())
>> 464 start_critical_timing(a0, a1);
>> 465 }
>> 466
>> 467 #else /* !CONFIG_PROVE_LOCKING */
>> 468
>> 469 /*
>> 470 * We are only interested in hardirq on/off events:
>> 471 */
>> 472 static inline void tracer_hardirqs_on(void)
>> 473 {
>> 474 if (!preempt_trace() && irq_trace())
>> 475 stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
>> 476 }
>> 477
>> 478 static inline void tracer_hardirqs_off(void)
>> 479 {
>> 480 if (!preempt_trace() && irq_trace())
>> 481 start_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
>> 482 }
>> 483
>> 484 static inline void tracer_hardirqs_on_caller(unsigned long caller_addr)
>> 485 {
>> 486 if (!preempt_trace() && irq_trace())
>> 487 stop_critical_timing(CALLER_ADDR0, caller_addr);
>> 488 }
>> 489
>> 490 static inline void tracer_hardirqs_off_caller(unsigned long caller_addr)
>> 491 {
>> 492 if (!preempt_trace() && irq_trace())
>> 493 start_critical_timing(CALLER_ADDR0, caller_addr);
>> 494 }
>> 495
>> 496 #endif /* CONFIG_PROVE_LOCKING */
>> 497 #endif /* CONFIG_IRQSOFF_TRACER */
>> 498
>> 499 #ifdef CONFIG_PREEMPT_TRACER
>> 500 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1)
>> 501 {
>> 502 if (preempt_trace() && !irq_trace())
>> 503 stop_critical_timing(a0, a1);
>> 504 }
>> 505
>> 506 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1)
>> 507 {
>> 508 if (preempt_trace() && !irq_trace())
>> 509 start_critical_timing(a0, a1);
>> 510 }
>> 511 #endif /* CONFIG_PREEMPT_TRACER */
455 512
456 #ifdef CONFIG_FUNCTION_TRACER 513 #ifdef CONFIG_FUNCTION_TRACER
457 static bool function_enabled; 514 static bool function_enabled;
458 515
459 static int register_irqsoff_function(struct tr 516 static int register_irqsoff_function(struct trace_array *tr, int graph, int set)
460 { 517 {
461 int ret; 518 int ret;
462 519
463 /* 'set' is set if TRACE_ITER_FUNCTION 520 /* 'set' is set if TRACE_ITER_FUNCTION is about to be set */
464 if (function_enabled || (!set && !(tr- 521 if (function_enabled || (!set && !(tr->trace_flags & TRACE_ITER_FUNCTION)))
465 return 0; 522 return 0;
466 523
467 if (graph) 524 if (graph)
468 ret = register_ftrace_graph(&f !! 525 ret = register_ftrace_graph(&irqsoff_graph_return,
>> 526 &irqsoff_graph_entry);
469 else 527 else
470 ret = register_ftrace_function 528 ret = register_ftrace_function(tr->ops);
471 529
472 if (!ret) 530 if (!ret)
473 function_enabled = true; 531 function_enabled = true;
474 532
475 return ret; 533 return ret;
476 } 534 }
477 535
478 static void unregister_irqsoff_function(struct 536 static void unregister_irqsoff_function(struct trace_array *tr, int graph)
479 { 537 {
480 if (!function_enabled) 538 if (!function_enabled)
481 return; 539 return;
482 540
483 if (graph) 541 if (graph)
484 unregister_ftrace_graph(&fgrap !! 542 unregister_ftrace_graph();
485 else 543 else
486 unregister_ftrace_function(tr- 544 unregister_ftrace_function(tr->ops);
487 545
488 function_enabled = false; 546 function_enabled = false;
489 } 547 }
490 548
491 static int irqsoff_function_set(struct trace_a 549 static int irqsoff_function_set(struct trace_array *tr, u32 mask, int set)
492 { 550 {
493 if (!(mask & TRACE_ITER_FUNCTION)) 551 if (!(mask & TRACE_ITER_FUNCTION))
494 return 0; 552 return 0;
495 553
496 if (set) 554 if (set)
497 register_irqsoff_function(tr, 555 register_irqsoff_function(tr, is_graph(tr), 1);
498 else 556 else
499 unregister_irqsoff_function(tr 557 unregister_irqsoff_function(tr, is_graph(tr));
500 return 1; 558 return 1;
501 } 559 }
502 #else 560 #else
503 static int register_irqsoff_function(struct tr 561 static int register_irqsoff_function(struct trace_array *tr, int graph, int set)
504 { 562 {
505 return 0; 563 return 0;
506 } 564 }
507 static void unregister_irqsoff_function(struct 565 static void unregister_irqsoff_function(struct trace_array *tr, int graph) { }
508 static inline int irqsoff_function_set(struct 566 static inline int irqsoff_function_set(struct trace_array *tr, u32 mask, int set)
509 { 567 {
510 return 0; 568 return 0;
511 } 569 }
512 #endif /* CONFIG_FUNCTION_TRACER */ 570 #endif /* CONFIG_FUNCTION_TRACER */
513 571
514 static int irqsoff_flag_changed(struct trace_a 572 static int irqsoff_flag_changed(struct trace_array *tr, u32 mask, int set)
515 { 573 {
516 struct tracer *tracer = tr->current_tr 574 struct tracer *tracer = tr->current_trace;
517 575
518 if (irqsoff_function_set(tr, mask, set 576 if (irqsoff_function_set(tr, mask, set))
519 return 0; 577 return 0;
520 578
521 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 579 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
522 if (mask & TRACE_ITER_DISPLAY_GRAPH) 580 if (mask & TRACE_ITER_DISPLAY_GRAPH)
523 return irqsoff_display_graph(t 581 return irqsoff_display_graph(tr, set);
524 #endif 582 #endif
525 583
526 return trace_keep_overwrite(tracer, ma 584 return trace_keep_overwrite(tracer, mask, set);
527 } 585 }
528 586
529 static int start_irqsoff_tracer(struct trace_a 587 static int start_irqsoff_tracer(struct trace_array *tr, int graph)
530 { 588 {
531 int ret; 589 int ret;
532 590
533 ret = register_irqsoff_function(tr, gr 591 ret = register_irqsoff_function(tr, graph, 0);
534 592
535 if (!ret && tracing_is_enabled()) 593 if (!ret && tracing_is_enabled())
536 tracer_enabled = 1; 594 tracer_enabled = 1;
537 else 595 else
538 tracer_enabled = 0; 596 tracer_enabled = 0;
539 597
540 return ret; 598 return ret;
541 } 599 }
542 600
543 static void stop_irqsoff_tracer(struct trace_a 601 static void stop_irqsoff_tracer(struct trace_array *tr, int graph)
544 { 602 {
545 tracer_enabled = 0; 603 tracer_enabled = 0;
546 604
547 unregister_irqsoff_function(tr, graph) 605 unregister_irqsoff_function(tr, graph);
548 } 606 }
549 607
550 static bool irqsoff_busy; 608 static bool irqsoff_busy;
551 609
552 static int __irqsoff_tracer_init(struct trace_ 610 static int __irqsoff_tracer_init(struct trace_array *tr)
553 { 611 {
554 if (irqsoff_busy) 612 if (irqsoff_busy)
555 return -EBUSY; 613 return -EBUSY;
556 614
557 save_flags = tr->trace_flags; 615 save_flags = tr->trace_flags;
558 616
559 /* non overwrite screws up the latency 617 /* non overwrite screws up the latency tracers */
560 set_tracer_flag(tr, TRACE_ITER_OVERWRI 618 set_tracer_flag(tr, TRACE_ITER_OVERWRITE, 1);
561 set_tracer_flag(tr, TRACE_ITER_LATENCY 619 set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, 1);
562 /* without pause, we will produce garb <<
563 set_tracer_flag(tr, TRACE_ITER_PAUSE_O <<
564 620
565 tr->max_latency = 0; 621 tr->max_latency = 0;
566 irqsoff_trace = tr; 622 irqsoff_trace = tr;
567 /* make sure that the tracer is visibl 623 /* make sure that the tracer is visible */
568 smp_wmb(); 624 smp_wmb();
569 625
570 ftrace_init_array_ops(tr, irqsoff_trac 626 ftrace_init_array_ops(tr, irqsoff_tracer_call);
571 627
572 /* Only toplevel instance supports gra 628 /* Only toplevel instance supports graph tracing */
573 if (start_irqsoff_tracer(tr, (tr->flag 629 if (start_irqsoff_tracer(tr, (tr->flags & TRACE_ARRAY_FL_GLOBAL &&
574 is_graph 630 is_graph(tr))))
575 printk(KERN_ERR "failed to sta 631 printk(KERN_ERR "failed to start irqsoff tracer\n");
576 632
577 irqsoff_busy = true; 633 irqsoff_busy = true;
578 return 0; 634 return 0;
579 } 635 }
580 636
581 static void __irqsoff_tracer_reset(struct trac !! 637 static void irqsoff_tracer_reset(struct trace_array *tr)
582 { 638 {
583 int lat_flag = save_flags & TRACE_ITER 639 int lat_flag = save_flags & TRACE_ITER_LATENCY_FMT;
584 int overwrite_flag = save_flags & TRAC 640 int overwrite_flag = save_flags & TRACE_ITER_OVERWRITE;
585 int pause_flag = save_flags & TRACE_IT <<
586 641
587 stop_irqsoff_tracer(tr, is_graph(tr)); 642 stop_irqsoff_tracer(tr, is_graph(tr));
588 643
589 set_tracer_flag(tr, TRACE_ITER_LATENCY 644 set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, lat_flag);
590 set_tracer_flag(tr, TRACE_ITER_OVERWRI 645 set_tracer_flag(tr, TRACE_ITER_OVERWRITE, overwrite_flag);
591 set_tracer_flag(tr, TRACE_ITER_PAUSE_O <<
592 ftrace_reset_array_ops(tr); 646 ftrace_reset_array_ops(tr);
593 647
594 irqsoff_busy = false; 648 irqsoff_busy = false;
595 } 649 }
596 650
597 static void irqsoff_tracer_start(struct trace_ 651 static void irqsoff_tracer_start(struct trace_array *tr)
598 { 652 {
599 tracer_enabled = 1; 653 tracer_enabled = 1;
600 } 654 }
601 655
602 static void irqsoff_tracer_stop(struct trace_a 656 static void irqsoff_tracer_stop(struct trace_array *tr)
603 { 657 {
604 tracer_enabled = 0; 658 tracer_enabled = 0;
605 } 659 }
606 660
607 #ifdef CONFIG_IRQSOFF_TRACER 661 #ifdef CONFIG_IRQSOFF_TRACER
608 /* <<
609 * We are only interested in hardirq on/off ev <<
610 */ <<
611 void tracer_hardirqs_on(unsigned long a0, unsi <<
612 { <<
613 if (!preempt_trace(preempt_count()) && <<
614 stop_critical_timing(a0, a1); <<
615 } <<
616 NOKPROBE_SYMBOL(tracer_hardirqs_on); <<
617 <<
618 void tracer_hardirqs_off(unsigned long a0, uns <<
619 { <<
620 if (!preempt_trace(preempt_count()) && <<
621 start_critical_timing(a0, a1); <<
622 } <<
623 NOKPROBE_SYMBOL(tracer_hardirqs_off); <<
624 <<
625 static int irqsoff_tracer_init(struct trace_ar 662 static int irqsoff_tracer_init(struct trace_array *tr)
626 { 663 {
627 trace_type = TRACER_IRQS_OFF; 664 trace_type = TRACER_IRQS_OFF;
628 665
629 return __irqsoff_tracer_init(tr); 666 return __irqsoff_tracer_init(tr);
630 } 667 }
631 <<
632 static void irqsoff_tracer_reset(struct trace_ <<
633 { <<
634 __irqsoff_tracer_reset(tr); <<
635 } <<
636 <<
637 static struct tracer irqsoff_tracer __read_mos 668 static struct tracer irqsoff_tracer __read_mostly =
638 { 669 {
639 .name = "irqsoff", 670 .name = "irqsoff",
640 .init = irqsoff_tracer_init, 671 .init = irqsoff_tracer_init,
641 .reset = irqsoff_tracer_reset 672 .reset = irqsoff_tracer_reset,
642 .start = irqsoff_tracer_start 673 .start = irqsoff_tracer_start,
643 .stop = irqsoff_tracer_stop, 674 .stop = irqsoff_tracer_stop,
644 .print_max = true, 675 .print_max = true,
645 .print_header = irqsoff_print_header 676 .print_header = irqsoff_print_header,
646 .print_line = irqsoff_print_line, 677 .print_line = irqsoff_print_line,
647 .flag_changed = irqsoff_flag_changed 678 .flag_changed = irqsoff_flag_changed,
648 #ifdef CONFIG_FTRACE_SELFTEST 679 #ifdef CONFIG_FTRACE_SELFTEST
649 .selftest = trace_selftest_startup_ 680 .selftest = trace_selftest_startup_irqsoff,
650 #endif 681 #endif
651 .open = irqsoff_trace_open, 682 .open = irqsoff_trace_open,
652 .close = irqsoff_trace_close, 683 .close = irqsoff_trace_close,
653 .allow_instances = true, 684 .allow_instances = true,
654 .use_max_tr = true, 685 .use_max_tr = true,
655 }; 686 };
656 #endif /* CONFIG_IRQSOFF_TRACER */ !! 687 # define register_irqsoff(trace) register_tracer(&trace)
>> 688 #else
>> 689 # define register_irqsoff(trace) do { } while (0)
>> 690 #endif
657 691
658 #ifdef CONFIG_PREEMPT_TRACER 692 #ifdef CONFIG_PREEMPT_TRACER
659 void tracer_preempt_on(unsigned long a0, unsig <<
660 { <<
661 if (preempt_trace(preempt_count()) && <<
662 stop_critical_timing(a0, a1); <<
663 } <<
664 <<
665 void tracer_preempt_off(unsigned long a0, unsi <<
666 { <<
667 if (preempt_trace(preempt_count()) && <<
668 start_critical_timing(a0, a1); <<
669 } <<
670 <<
671 static int preemptoff_tracer_init(struct trace 693 static int preemptoff_tracer_init(struct trace_array *tr)
672 { 694 {
673 trace_type = TRACER_PREEMPT_OFF; 695 trace_type = TRACER_PREEMPT_OFF;
674 696
675 return __irqsoff_tracer_init(tr); 697 return __irqsoff_tracer_init(tr);
676 } 698 }
677 699
678 static void preemptoff_tracer_reset(struct tra <<
679 { <<
680 __irqsoff_tracer_reset(tr); <<
681 } <<
682 <<
683 static struct tracer preemptoff_tracer __read_ 700 static struct tracer preemptoff_tracer __read_mostly =
684 { 701 {
685 .name = "preemptoff", 702 .name = "preemptoff",
686 .init = preemptoff_tracer_in 703 .init = preemptoff_tracer_init,
687 .reset = preemptoff_tracer_re !! 704 .reset = irqsoff_tracer_reset,
688 .start = irqsoff_tracer_start 705 .start = irqsoff_tracer_start,
689 .stop = irqsoff_tracer_stop, 706 .stop = irqsoff_tracer_stop,
690 .print_max = true, 707 .print_max = true,
691 .print_header = irqsoff_print_header 708 .print_header = irqsoff_print_header,
692 .print_line = irqsoff_print_line, 709 .print_line = irqsoff_print_line,
693 .flag_changed = irqsoff_flag_changed 710 .flag_changed = irqsoff_flag_changed,
694 #ifdef CONFIG_FTRACE_SELFTEST 711 #ifdef CONFIG_FTRACE_SELFTEST
695 .selftest = trace_selftest_startup_ 712 .selftest = trace_selftest_startup_preemptoff,
696 #endif 713 #endif
697 .open = irqsoff_trace_open, 714 .open = irqsoff_trace_open,
698 .close = irqsoff_trace_close, 715 .close = irqsoff_trace_close,
699 .allow_instances = true, 716 .allow_instances = true,
700 .use_max_tr = true, 717 .use_max_tr = true,
701 }; 718 };
702 #endif /* CONFIG_PREEMPT_TRACER */ !! 719 # define register_preemptoff(trace) register_tracer(&trace)
>> 720 #else
>> 721 # define register_preemptoff(trace) do { } while (0)
>> 722 #endif
703 723
704 #if defined(CONFIG_IRQSOFF_TRACER) && defined( !! 724 #if defined(CONFIG_IRQSOFF_TRACER) && \
>> 725 defined(CONFIG_PREEMPT_TRACER)
705 726
706 static int preemptirqsoff_tracer_init(struct t 727 static int preemptirqsoff_tracer_init(struct trace_array *tr)
707 { 728 {
708 trace_type = TRACER_IRQS_OFF | TRACER_ 729 trace_type = TRACER_IRQS_OFF | TRACER_PREEMPT_OFF;
709 730
710 return __irqsoff_tracer_init(tr); 731 return __irqsoff_tracer_init(tr);
711 } 732 }
712 733
713 static void preemptirqsoff_tracer_reset(struct <<
714 { <<
715 __irqsoff_tracer_reset(tr); <<
716 } <<
717 <<
718 static struct tracer preemptirqsoff_tracer __r 734 static struct tracer preemptirqsoff_tracer __read_mostly =
719 { 735 {
720 .name = "preemptirqsoff", 736 .name = "preemptirqsoff",
721 .init = preemptirqsoff_trace 737 .init = preemptirqsoff_tracer_init,
722 .reset = preemptirqsoff_trace !! 738 .reset = irqsoff_tracer_reset,
723 .start = irqsoff_tracer_start 739 .start = irqsoff_tracer_start,
724 .stop = irqsoff_tracer_stop, 740 .stop = irqsoff_tracer_stop,
725 .print_max = true, 741 .print_max = true,
726 .print_header = irqsoff_print_header 742 .print_header = irqsoff_print_header,
727 .print_line = irqsoff_print_line, 743 .print_line = irqsoff_print_line,
728 .flag_changed = irqsoff_flag_changed 744 .flag_changed = irqsoff_flag_changed,
729 #ifdef CONFIG_FTRACE_SELFTEST 745 #ifdef CONFIG_FTRACE_SELFTEST
730 .selftest = trace_selftest_startup_ 746 .selftest = trace_selftest_startup_preemptirqsoff,
731 #endif 747 #endif
732 .open = irqsoff_trace_open, 748 .open = irqsoff_trace_open,
733 .close = irqsoff_trace_close, 749 .close = irqsoff_trace_close,
734 .allow_instances = true, 750 .allow_instances = true,
735 .use_max_tr = true, 751 .use_max_tr = true,
736 }; 752 };
>> 753
>> 754 # define register_preemptirqsoff(trace) register_tracer(&trace)
>> 755 #else
>> 756 # define register_preemptirqsoff(trace) do { } while (0)
737 #endif 757 #endif
738 758
739 __init static int init_irqsoff_tracer(void) 759 __init static int init_irqsoff_tracer(void)
740 { 760 {
741 #ifdef CONFIG_IRQSOFF_TRACER !! 761 register_irqsoff(irqsoff_tracer);
742 register_tracer(&irqsoff_tracer); !! 762 register_preemptoff(preemptoff_tracer);
743 #endif !! 763 register_preemptirqsoff(preemptirqsoff_tracer);
744 #ifdef CONFIG_PREEMPT_TRACER <<
745 register_tracer(&preemptoff_tracer); <<
746 #endif <<
747 #if defined(CONFIG_IRQSOFF_TRACER) && defined( <<
748 register_tracer(&preemptirqsoff_tracer <<
749 #endif <<
750 764
751 return 0; 765 return 0;
752 } 766 }
753 core_initcall(init_irqsoff_tracer); 767 core_initcall(init_irqsoff_tracer);
754 #endif /* IRQSOFF_TRACER || PREEMPTOFF_TRACER 768 #endif /* IRQSOFF_TRACER || PREEMPTOFF_TRACER */
>> 769
>> 770 #ifndef CONFIG_IRQSOFF_TRACER
>> 771 static inline void tracer_hardirqs_on(void) { }
>> 772 static inline void tracer_hardirqs_off(void) { }
>> 773 static inline void tracer_hardirqs_on_caller(unsigned long caller_addr) { }
>> 774 static inline void tracer_hardirqs_off_caller(unsigned long caller_addr) { }
>> 775 #endif
>> 776
>> 777 #ifndef CONFIG_PREEMPT_TRACER
>> 778 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { }
>> 779 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { }
>> 780 #endif
>> 781
>> 782 #if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PROVE_LOCKING)
>> 783 /* Per-cpu variable to prevent redundant calls when IRQs already off */
>> 784 static DEFINE_PER_CPU(int, tracing_irq_cpu);
>> 785
>> 786 void trace_hardirqs_on(void)
>> 787 {
>> 788 if (!this_cpu_read(tracing_irq_cpu))
>> 789 return;
>> 790
>> 791 trace_irq_enable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
>> 792 tracer_hardirqs_on();
>> 793
>> 794 this_cpu_write(tracing_irq_cpu, 0);
>> 795 }
>> 796 EXPORT_SYMBOL(trace_hardirqs_on);
>> 797
>> 798 void trace_hardirqs_off(void)
>> 799 {
>> 800 if (this_cpu_read(tracing_irq_cpu))
>> 801 return;
>> 802
>> 803 this_cpu_write(tracing_irq_cpu, 1);
>> 804
>> 805 trace_irq_disable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
>> 806 tracer_hardirqs_off();
>> 807 }
>> 808 EXPORT_SYMBOL(trace_hardirqs_off);
>> 809
>> 810 __visible void trace_hardirqs_on_caller(unsigned long caller_addr)
>> 811 {
>> 812 if (!this_cpu_read(tracing_irq_cpu))
>> 813 return;
>> 814
>> 815 trace_irq_enable_rcuidle(CALLER_ADDR0, caller_addr);
>> 816 tracer_hardirqs_on_caller(caller_addr);
>> 817
>> 818 this_cpu_write(tracing_irq_cpu, 0);
>> 819 }
>> 820 EXPORT_SYMBOL(trace_hardirqs_on_caller);
>> 821
>> 822 __visible void trace_hardirqs_off_caller(unsigned long caller_addr)
>> 823 {
>> 824 if (this_cpu_read(tracing_irq_cpu))
>> 825 return;
>> 826
>> 827 this_cpu_write(tracing_irq_cpu, 1);
>> 828
>> 829 trace_irq_disable_rcuidle(CALLER_ADDR0, caller_addr);
>> 830 tracer_hardirqs_off_caller(caller_addr);
>> 831 }
>> 832 EXPORT_SYMBOL(trace_hardirqs_off_caller);
>> 833
>> 834 /*
>> 835 * Stubs:
>> 836 */
>> 837
>> 838 void trace_softirqs_on(unsigned long ip)
>> 839 {
>> 840 }
>> 841
>> 842 void trace_softirqs_off(unsigned long ip)
>> 843 {
>> 844 }
>> 845
>> 846 inline void print_irqtrace_events(struct task_struct *curr)
>> 847 {
>> 848 }
>> 849 #endif
>> 850
>> 851 #if defined(CONFIG_PREEMPT_TRACER) || \
>> 852 (defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_PREEMPTIRQ_EVENTS))
>> 853 void trace_preempt_on(unsigned long a0, unsigned long a1)
>> 854 {
>> 855 trace_preempt_enable_rcuidle(a0, a1);
>> 856 tracer_preempt_on(a0, a1);
>> 857 }
>> 858
>> 859 void trace_preempt_off(unsigned long a0, unsigned long a1)
>> 860 {
>> 861 trace_preempt_disable_rcuidle(a0, a1);
>> 862 tracer_preempt_off(a0, a1);
>> 863 }
>> 864 #endif
755 865
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