1 /* Include in trace.c */
3 #include <linux/stringify.h>
4 #include <linux/kthread.h>
5 #include <linux/delay.h>
6 #include <linux/slab.h>
8 static inline int trace_valid_entry(struct trace_entry *entry)
10 switch (entry->type) {
24 static int trace_test_buffer_cpu(struct trace_buffer *buf, int cpu)
26 struct ring_buffer_event *event;
27 struct trace_entry *entry;
28 unsigned int loops = 0;
30 while ((event = ring_buffer_consume(buf->buffer, cpu, NULL, NULL))) {
31 entry = ring_buffer_event_data(event);
34 * The ring buffer is a size of trace_buf_size, if
35 * we loop more than the size, there's something wrong
36 * with the ring buffer.
38 if (loops++ > trace_buf_size) {
39 printk(KERN_CONT ".. bad ring buffer ");
42 if (!trace_valid_entry(entry)) {
43 printk(KERN_CONT ".. invalid entry %d ",
53 printk(KERN_CONT ".. corrupted trace buffer .. ");
58 * Test the trace buffer to see if all the elements
61 static int trace_test_buffer(struct trace_buffer *buf, unsigned long *count)
63 unsigned long flags, cnt = 0;
66 /* Don't allow flipping of max traces now */
67 local_irq_save(flags);
68 arch_spin_lock(&ftrace_max_lock);
70 cnt = ring_buffer_entries(buf->buffer);
73 * The trace_test_buffer_cpu runs a while loop to consume all data.
74 * If the calling tracer is broken, and is constantly filling
75 * the buffer, this will run forever, and hard lock the box.
76 * We disable the ring buffer while we do this test to prevent
80 for_each_possible_cpu(cpu) {
81 ret = trace_test_buffer_cpu(buf, cpu);
86 arch_spin_unlock(&ftrace_max_lock);
87 local_irq_restore(flags);
95 static inline void warn_failed_init_tracer(struct tracer *trace, int init_ret)
97 printk(KERN_WARNING "Failed to init %s tracer, init returned %d\n",
98 trace->name, init_ret);
100 #ifdef CONFIG_FUNCTION_TRACER
102 #ifdef CONFIG_DYNAMIC_FTRACE
104 static int trace_selftest_test_probe1_cnt;
105 static void trace_selftest_test_probe1_func(unsigned long ip,
107 struct ftrace_ops *op,
108 struct pt_regs *pt_regs)
110 trace_selftest_test_probe1_cnt++;
113 static int trace_selftest_test_probe2_cnt;
114 static void trace_selftest_test_probe2_func(unsigned long ip,
116 struct ftrace_ops *op,
117 struct pt_regs *pt_regs)
119 trace_selftest_test_probe2_cnt++;
122 static int trace_selftest_test_probe3_cnt;
123 static void trace_selftest_test_probe3_func(unsigned long ip,
125 struct ftrace_ops *op,
126 struct pt_regs *pt_regs)
128 trace_selftest_test_probe3_cnt++;
131 static int trace_selftest_test_global_cnt;
132 static void trace_selftest_test_global_func(unsigned long ip,
134 struct ftrace_ops *op,
135 struct pt_regs *pt_regs)
137 trace_selftest_test_global_cnt++;
140 static int trace_selftest_test_dyn_cnt;
141 static void trace_selftest_test_dyn_func(unsigned long ip,
143 struct ftrace_ops *op,
144 struct pt_regs *pt_regs)
146 trace_selftest_test_dyn_cnt++;
149 static struct ftrace_ops test_probe1 = {
150 .func = trace_selftest_test_probe1_func,
151 .flags = FTRACE_OPS_FL_RECURSION_SAFE,
154 static struct ftrace_ops test_probe2 = {
155 .func = trace_selftest_test_probe2_func,
156 .flags = FTRACE_OPS_FL_RECURSION_SAFE,
159 static struct ftrace_ops test_probe3 = {
160 .func = trace_selftest_test_probe3_func,
161 .flags = FTRACE_OPS_FL_RECURSION_SAFE,
164 static struct ftrace_ops test_global = {
165 .func = trace_selftest_test_global_func,
166 .flags = FTRACE_OPS_FL_GLOBAL | FTRACE_OPS_FL_RECURSION_SAFE,
169 static void print_counts(void)
171 printk("(%d %d %d %d %d) ",
172 trace_selftest_test_probe1_cnt,
173 trace_selftest_test_probe2_cnt,
174 trace_selftest_test_probe3_cnt,
175 trace_selftest_test_global_cnt,
176 trace_selftest_test_dyn_cnt);
179 static void reset_counts(void)
181 trace_selftest_test_probe1_cnt = 0;
182 trace_selftest_test_probe2_cnt = 0;
183 trace_selftest_test_probe3_cnt = 0;
184 trace_selftest_test_global_cnt = 0;
185 trace_selftest_test_dyn_cnt = 0;
188 static int trace_selftest_ops(int cnt)
190 int save_ftrace_enabled = ftrace_enabled;
191 struct ftrace_ops *dyn_ops;
198 printk(KERN_CONT "PASSED\n");
199 pr_info("Testing dynamic ftrace ops #%d: ", cnt);
204 /* Handle PPC64 '.' name */
205 func1_name = "*" __stringify(DYN_FTRACE_TEST_NAME);
206 func2_name = "*" __stringify(DYN_FTRACE_TEST_NAME2);
207 len1 = strlen(func1_name);
208 len2 = strlen(func2_name);
211 * Probe 1 will trace function 1.
212 * Probe 2 will trace function 2.
213 * Probe 3 will trace functions 1 and 2.
215 ftrace_set_filter(&test_probe1, func1_name, len1, 1);
216 ftrace_set_filter(&test_probe2, func2_name, len2, 1);
217 ftrace_set_filter(&test_probe3, func1_name, len1, 1);
218 ftrace_set_filter(&test_probe3, func2_name, len2, 0);
220 register_ftrace_function(&test_probe1);
221 register_ftrace_function(&test_probe2);
222 register_ftrace_function(&test_probe3);
223 register_ftrace_function(&test_global);
225 DYN_FTRACE_TEST_NAME();
229 if (trace_selftest_test_probe1_cnt != 1)
231 if (trace_selftest_test_probe2_cnt != 0)
233 if (trace_selftest_test_probe3_cnt != 1)
235 if (trace_selftest_test_global_cnt == 0)
238 DYN_FTRACE_TEST_NAME2();
242 if (trace_selftest_test_probe1_cnt != 1)
244 if (trace_selftest_test_probe2_cnt != 1)
246 if (trace_selftest_test_probe3_cnt != 2)
249 /* Add a dynamic probe */
250 dyn_ops = kzalloc(sizeof(*dyn_ops), GFP_KERNEL);
252 printk("MEMORY ERROR ");
256 dyn_ops->func = trace_selftest_test_dyn_func;
258 register_ftrace_function(dyn_ops);
260 trace_selftest_test_global_cnt = 0;
262 DYN_FTRACE_TEST_NAME();
266 if (trace_selftest_test_probe1_cnt != 2)
268 if (trace_selftest_test_probe2_cnt != 1)
270 if (trace_selftest_test_probe3_cnt != 3)
272 if (trace_selftest_test_global_cnt == 0)
274 if (trace_selftest_test_dyn_cnt == 0)
277 DYN_FTRACE_TEST_NAME2();
281 if (trace_selftest_test_probe1_cnt != 2)
283 if (trace_selftest_test_probe2_cnt != 2)
285 if (trace_selftest_test_probe3_cnt != 4)
290 unregister_ftrace_function(dyn_ops);
294 /* Purposely unregister in the same order */
295 unregister_ftrace_function(&test_probe1);
296 unregister_ftrace_function(&test_probe2);
297 unregister_ftrace_function(&test_probe3);
298 unregister_ftrace_function(&test_global);
300 /* Make sure everything is off */
302 DYN_FTRACE_TEST_NAME();
303 DYN_FTRACE_TEST_NAME();
305 if (trace_selftest_test_probe1_cnt ||
306 trace_selftest_test_probe2_cnt ||
307 trace_selftest_test_probe3_cnt ||
308 trace_selftest_test_global_cnt ||
309 trace_selftest_test_dyn_cnt)
312 ftrace_enabled = save_ftrace_enabled;
317 /* Test dynamic code modification and ftrace filters */
318 int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
319 struct trace_array *tr,
322 int save_ftrace_enabled = ftrace_enabled;
327 /* The ftrace test PASSED */
328 printk(KERN_CONT "PASSED\n");
329 pr_info("Testing dynamic ftrace: ");
331 /* enable tracing, and record the filter function */
334 /* passed in by parameter to fool gcc from optimizing */
338 * Some archs *cough*PowerPC*cough* add characters to the
339 * start of the function names. We simply put a '*' to
342 func_name = "*" __stringify(DYN_FTRACE_TEST_NAME);
344 /* filter only on our function */
345 ftrace_set_global_filter(func_name, strlen(func_name), 1);
348 ret = tracer_init(trace, tr);
350 warn_failed_init_tracer(trace, ret);
354 /* Sleep for a 1/10 of a second */
357 /* we should have nothing in the buffer */
358 ret = trace_test_buffer(&tr->trace_buffer, &count);
364 printk(KERN_CONT ".. filter did not filter .. ");
368 /* call our function again */
374 /* stop the tracing. */
378 /* check the trace buffer */
379 ret = trace_test_buffer(&tr->trace_buffer, &count);
382 /* we should only have one item */
383 if (!ret && count != 1) {
385 printk(KERN_CONT ".. filter failed count=%ld ..", count);
390 /* Test the ops with global tracing running */
391 ret = trace_selftest_ops(1);
395 ftrace_enabled = save_ftrace_enabled;
397 /* Enable tracing on all functions again */
398 ftrace_set_global_filter(NULL, 0, 1);
400 /* Test the ops with global tracing off */
402 ret = trace_selftest_ops(2);
407 static int trace_selftest_recursion_cnt;
408 static void trace_selftest_test_recursion_func(unsigned long ip,
410 struct ftrace_ops *op,
411 struct pt_regs *pt_regs)
414 * This function is registered without the recursion safe flag.
415 * The ftrace infrastructure should provide the recursion
416 * protection. If not, this will crash the kernel!
418 if (trace_selftest_recursion_cnt++ > 10)
420 DYN_FTRACE_TEST_NAME();
423 static void trace_selftest_test_recursion_safe_func(unsigned long ip,
425 struct ftrace_ops *op,
426 struct pt_regs *pt_regs)
429 * We said we would provide our own recursion. By calling
430 * this function again, we should recurse back into this function
431 * and count again. But this only happens if the arch supports
432 * all of ftrace features and nothing else is using the function
435 if (trace_selftest_recursion_cnt++)
437 DYN_FTRACE_TEST_NAME();
440 static struct ftrace_ops test_rec_probe = {
441 .func = trace_selftest_test_recursion_func,
444 static struct ftrace_ops test_recsafe_probe = {
445 .func = trace_selftest_test_recursion_safe_func,
446 .flags = FTRACE_OPS_FL_RECURSION_SAFE,
450 trace_selftest_function_recursion(void)
452 int save_ftrace_enabled = ftrace_enabled;
457 /* The previous test PASSED */
459 pr_info("Testing ftrace recursion: ");
462 /* enable tracing, and record the filter function */
465 /* Handle PPC64 '.' name */
466 func_name = "*" __stringify(DYN_FTRACE_TEST_NAME);
467 len = strlen(func_name);
469 ret = ftrace_set_filter(&test_rec_probe, func_name, len, 1);
471 pr_cont("*Could not set filter* ");
475 ret = register_ftrace_function(&test_rec_probe);
477 pr_cont("*could not register callback* ");
481 DYN_FTRACE_TEST_NAME();
483 unregister_ftrace_function(&test_rec_probe);
486 if (trace_selftest_recursion_cnt != 1) {
487 pr_cont("*callback not called once (%d)* ",
488 trace_selftest_recursion_cnt);
492 trace_selftest_recursion_cnt = 1;
495 pr_info("Testing ftrace recursion safe: ");
497 ret = ftrace_set_filter(&test_recsafe_probe, func_name, len, 1);
499 pr_cont("*Could not set filter* ");
503 ret = register_ftrace_function(&test_recsafe_probe);
505 pr_cont("*could not register callback* ");
509 DYN_FTRACE_TEST_NAME();
511 unregister_ftrace_function(&test_recsafe_probe);
514 if (trace_selftest_recursion_cnt != 2) {
515 pr_cont("*callback not called expected 2 times (%d)* ",
516 trace_selftest_recursion_cnt);
522 ftrace_enabled = save_ftrace_enabled;
527 # define trace_selftest_startup_dynamic_tracing(trace, tr, func) ({ 0; })
528 # define trace_selftest_function_recursion() ({ 0; })
529 #endif /* CONFIG_DYNAMIC_FTRACE */
532 TRACE_SELFTEST_REGS_START,
533 TRACE_SELFTEST_REGS_FOUND,
534 TRACE_SELFTEST_REGS_NOT_FOUND,
535 } trace_selftest_regs_stat;
537 static void trace_selftest_test_regs_func(unsigned long ip,
539 struct ftrace_ops *op,
540 struct pt_regs *pt_regs)
543 trace_selftest_regs_stat = TRACE_SELFTEST_REGS_FOUND;
545 trace_selftest_regs_stat = TRACE_SELFTEST_REGS_NOT_FOUND;
548 static struct ftrace_ops test_regs_probe = {
549 .func = trace_selftest_test_regs_func,
550 .flags = FTRACE_OPS_FL_RECURSION_SAFE | FTRACE_OPS_FL_SAVE_REGS,
554 trace_selftest_function_regs(void)
556 int save_ftrace_enabled = ftrace_enabled;
562 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
566 /* The previous test PASSED */
568 pr_info("Testing ftrace regs%s: ",
569 !supported ? "(no arch support)" : "");
571 /* enable tracing, and record the filter function */
574 /* Handle PPC64 '.' name */
575 func_name = "*" __stringify(DYN_FTRACE_TEST_NAME);
576 len = strlen(func_name);
578 ret = ftrace_set_filter(&test_regs_probe, func_name, len, 1);
580 * If DYNAMIC_FTRACE is not set, then we just trace all functions.
581 * This test really doesn't care.
583 if (ret && ret != -ENODEV) {
584 pr_cont("*Could not set filter* ");
588 ret = register_ftrace_function(&test_regs_probe);
590 * Now if the arch does not support passing regs, then this should
595 pr_cont("*registered save-regs without arch support* ");
598 test_regs_probe.flags |= FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED;
599 ret = register_ftrace_function(&test_regs_probe);
602 pr_cont("*could not register callback* ");
607 DYN_FTRACE_TEST_NAME();
609 unregister_ftrace_function(&test_regs_probe);
613 switch (trace_selftest_regs_stat) {
614 case TRACE_SELFTEST_REGS_START:
615 pr_cont("*callback never called* ");
618 case TRACE_SELFTEST_REGS_FOUND:
621 pr_cont("*callback received regs without arch support* ");
624 case TRACE_SELFTEST_REGS_NOT_FOUND:
627 pr_cont("*callback received NULL regs* ");
633 ftrace_enabled = save_ftrace_enabled;
639 * Simple verification test of ftrace function tracer.
640 * Enable ftrace, sleep 1/10 second, and then read the trace
641 * buffer to see if all is in order.
644 trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr)
646 int save_ftrace_enabled = ftrace_enabled;
650 /* make sure msleep has been recorded */
653 /* start the tracing */
656 ret = tracer_init(trace, tr);
658 warn_failed_init_tracer(trace, ret);
662 /* Sleep for a 1/10 of a second */
664 /* stop the tracing. */
668 /* check the trace buffer */
669 ret = trace_test_buffer(&tr->trace_buffer, &count);
673 if (!ret && !count) {
674 printk(KERN_CONT ".. no entries found ..");
679 ret = trace_selftest_startup_dynamic_tracing(trace, tr,
680 DYN_FTRACE_TEST_NAME);
684 ret = trace_selftest_function_recursion();
688 ret = trace_selftest_function_regs();
690 ftrace_enabled = save_ftrace_enabled;
692 /* kill ftrace totally if we failed */
698 #endif /* CONFIG_FUNCTION_TRACER */
701 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
703 /* Maximum number of functions to trace before diagnosing a hang */
704 #define GRAPH_MAX_FUNC_TEST 100000000
706 static unsigned int graph_hang_thresh;
708 /* Wrap the real function entry probe to avoid possible hanging */
709 static int trace_graph_entry_watchdog(struct ftrace_graph_ent *trace)
711 /* This is harmlessly racy, we want to approximately detect a hang */
712 if (unlikely(++graph_hang_thresh > GRAPH_MAX_FUNC_TEST)) {
714 printk(KERN_WARNING "BUG: Function graph tracer hang!\n");
715 if (ftrace_dump_on_oops) {
716 ftrace_dump(DUMP_ALL);
717 /* ftrace_dump() disables tracing */
723 return trace_graph_entry(trace);
727 * Pretty much the same than for the function tracer from which the selftest
731 trace_selftest_startup_function_graph(struct tracer *trace,
732 struct trace_array *tr)
738 * Simulate the init() callback but we attach a watchdog callback
739 * to detect and recover from possible hangs
741 tracing_reset_online_cpus(&tr->trace_buffer);
743 ret = register_ftrace_graph(&trace_graph_return,
744 &trace_graph_entry_watchdog);
746 warn_failed_init_tracer(trace, ret);
749 tracing_start_cmdline_record();
751 /* Sleep for a 1/10 of a second */
754 /* Have we just recovered from a hang? */
755 if (graph_hang_thresh > GRAPH_MAX_FUNC_TEST) {
756 tracing_selftest_disabled = true;
763 /* check the trace buffer */
764 ret = trace_test_buffer(&tr->trace_buffer, &count);
769 if (!ret && !count) {
770 printk(KERN_CONT ".. no entries found ..");
775 /* Don't test dynamic tracing, the function tracer already did */
778 /* Stop it if we failed */
784 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
787 #ifdef CONFIG_IRQSOFF_TRACER
789 trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr)
791 unsigned long save_max = tracing_max_latency;
795 /* start the tracing */
796 ret = tracer_init(trace, tr);
798 warn_failed_init_tracer(trace, ret);
802 /* reset the max latency */
803 tracing_max_latency = 0;
804 /* disable interrupts for a bit */
810 * Stop the tracer to avoid a warning subsequent
811 * to buffer flipping failure because tracing_stop()
812 * disables the tr and max buffers, making flipping impossible
813 * in case of parallels max irqs off latencies.
816 /* stop the tracing. */
818 /* check both trace buffers */
819 ret = trace_test_buffer(&tr->trace_buffer, NULL);
821 ret = trace_test_buffer(&tr->max_buffer, &count);
825 if (!ret && !count) {
826 printk(KERN_CONT ".. no entries found ..");
830 tracing_max_latency = save_max;
834 #endif /* CONFIG_IRQSOFF_TRACER */
836 #ifdef CONFIG_PREEMPT_TRACER
838 trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr)
840 unsigned long save_max = tracing_max_latency;
845 * Now that the big kernel lock is no longer preemptable,
846 * and this is called with the BKL held, it will always
847 * fail. If preemption is already disabled, simply
848 * pass the test. When the BKL is removed, or becomes
849 * preemptible again, we will once again test this,
852 if (preempt_count()) {
853 printk(KERN_CONT "can not test ... force ");
857 /* start the tracing */
858 ret = tracer_init(trace, tr);
860 warn_failed_init_tracer(trace, ret);
864 /* reset the max latency */
865 tracing_max_latency = 0;
866 /* disable preemption for a bit */
872 * Stop the tracer to avoid a warning subsequent
873 * to buffer flipping failure because tracing_stop()
874 * disables the tr and max buffers, making flipping impossible
875 * in case of parallels max preempt off latencies.
878 /* stop the tracing. */
880 /* check both trace buffers */
881 ret = trace_test_buffer(&tr->trace_buffer, NULL);
883 ret = trace_test_buffer(&tr->max_buffer, &count);
887 if (!ret && !count) {
888 printk(KERN_CONT ".. no entries found ..");
892 tracing_max_latency = save_max;
896 #endif /* CONFIG_PREEMPT_TRACER */
898 #if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER)
900 trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *tr)
902 unsigned long save_max = tracing_max_latency;
907 * Now that the big kernel lock is no longer preemptable,
908 * and this is called with the BKL held, it will always
909 * fail. If preemption is already disabled, simply
910 * pass the test. When the BKL is removed, or becomes
911 * preemptible again, we will once again test this,
914 if (preempt_count()) {
915 printk(KERN_CONT "can not test ... force ");
919 /* start the tracing */
920 ret = tracer_init(trace, tr);
922 warn_failed_init_tracer(trace, ret);
926 /* reset the max latency */
927 tracing_max_latency = 0;
929 /* disable preemption and interrupts for a bit */
934 /* reverse the order of preempt vs irqs */
938 * Stop the tracer to avoid a warning subsequent
939 * to buffer flipping failure because tracing_stop()
940 * disables the tr and max buffers, making flipping impossible
941 * in case of parallels max irqs/preempt off latencies.
944 /* stop the tracing. */
946 /* check both trace buffers */
947 ret = trace_test_buffer(&tr->trace_buffer, NULL);
951 ret = trace_test_buffer(&tr->max_buffer, &count);
955 if (!ret && !count) {
956 printk(KERN_CONT ".. no entries found ..");
961 /* do the test by disabling interrupts first this time */
962 tracing_max_latency = 0;
970 /* reverse the order of preempt vs irqs */
974 /* stop the tracing. */
976 /* check both trace buffers */
977 ret = trace_test_buffer(&tr->trace_buffer, NULL);
981 ret = trace_test_buffer(&tr->max_buffer, &count);
983 if (!ret && !count) {
984 printk(KERN_CONT ".. no entries found ..");
993 tracing_max_latency = save_max;
997 #endif /* CONFIG_IRQSOFF_TRACER && CONFIG_PREEMPT_TRACER */
999 #ifdef CONFIG_NOP_TRACER
1001 trace_selftest_startup_nop(struct tracer *trace, struct trace_array *tr)
1003 /* What could possibly go wrong? */
1008 #ifdef CONFIG_SCHED_TRACER
1009 static int trace_wakeup_test_thread(void *data)
1011 /* Make this a RT thread, doesn't need to be too high */
1012 static const struct sched_param param = { .sched_priority = 5 };
1013 struct completion *x = data;
1015 sched_setscheduler(current, SCHED_FIFO, ¶m);
1017 /* Make it know we have a new prio */
1020 /* now go to sleep and let the test wake us up */
1021 set_current_state(TASK_INTERRUPTIBLE);
1026 /* we are awake, now wait to disappear */
1027 while (!kthread_should_stop()) {
1029 * This is an RT task, do short sleeps to let
1039 trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr)
1041 unsigned long save_max = tracing_max_latency;
1042 struct task_struct *p;
1043 struct completion isrt;
1044 unsigned long count;
1047 init_completion(&isrt);
1049 /* create a high prio thread */
1050 p = kthread_run(trace_wakeup_test_thread, &isrt, "ftrace-test");
1052 printk(KERN_CONT "Failed to create ftrace wakeup test thread ");
1056 /* make sure the thread is running at an RT prio */
1057 wait_for_completion(&isrt);
1059 /* start the tracing */
1060 ret = tracer_init(trace, tr);
1062 warn_failed_init_tracer(trace, ret);
1066 /* reset the max latency */
1067 tracing_max_latency = 0;
1071 * Sleep to make sure the RT thread is asleep too.
1072 * On virtual machines we can't rely on timings,
1073 * but we want to make sure this test still works.
1078 init_completion(&isrt);
1082 /* Wait for the task to wake up */
1083 wait_for_completion(&isrt);
1085 /* stop the tracing. */
1087 /* check both trace buffers */
1088 ret = trace_test_buffer(&tr->trace_buffer, NULL);
1089 printk("ret = %d\n", ret);
1091 ret = trace_test_buffer(&tr->max_buffer, &count);
1097 tracing_max_latency = save_max;
1099 /* kill the thread */
1102 if (!ret && !count) {
1103 printk(KERN_CONT ".. no entries found ..");
1109 #endif /* CONFIG_SCHED_TRACER */
1111 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
1113 trace_selftest_startup_sched_switch(struct tracer *trace, struct trace_array *tr)
1115 unsigned long count;
1118 /* start the tracing */
1119 ret = tracer_init(trace, tr);
1121 warn_failed_init_tracer(trace, ret);
1125 /* Sleep for a 1/10 of a second */
1127 /* stop the tracing. */
1129 /* check the trace buffer */
1130 ret = trace_test_buffer(&tr->trace_buffer, &count);
1134 if (!ret && !count) {
1135 printk(KERN_CONT ".. no entries found ..");
1141 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
1143 #ifdef CONFIG_BRANCH_TRACER
1145 trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr)
1147 unsigned long count;
1150 /* start the tracing */
1151 ret = tracer_init(trace, tr);
1153 warn_failed_init_tracer(trace, ret);
1157 /* Sleep for a 1/10 of a second */
1159 /* stop the tracing. */
1161 /* check the trace buffer */
1162 ret = trace_test_buffer(tr, &count);
1166 if (!ret && !count) {
1167 printk(KERN_CONT ".. no entries found ..");
1173 #endif /* CONFIG_BRANCH_TRACER */