diff options
Diffstat (limited to 'kernel/trace/trace_selftest.c')
-rw-r--r-- | kernel/trace/trace_selftest.c | 59 |
1 files changed, 57 insertions, 2 deletions
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c index d2cdbabb4ead..280fea470d67 100644 --- a/kernel/trace/trace_selftest.c +++ b/kernel/trace/trace_selftest.c | |||
@@ -17,6 +17,7 @@ static inline int trace_valid_entry(struct trace_entry *entry) | |||
17 | case TRACE_GRAPH_ENT: | 17 | case TRACE_GRAPH_ENT: |
18 | case TRACE_GRAPH_RET: | 18 | case TRACE_GRAPH_RET: |
19 | case TRACE_HW_BRANCHES: | 19 | case TRACE_HW_BRANCHES: |
20 | case TRACE_KSYM: | ||
20 | return 1; | 21 | return 1; |
21 | } | 22 | } |
22 | return 0; | 23 | return 0; |
@@ -66,7 +67,7 @@ static int trace_test_buffer(struct trace_array *tr, unsigned long *count) | |||
66 | 67 | ||
67 | /* Don't allow flipping of max traces now */ | 68 | /* Don't allow flipping of max traces now */ |
68 | local_irq_save(flags); | 69 | local_irq_save(flags); |
69 | __raw_spin_lock(&ftrace_max_lock); | 70 | arch_spin_lock(&ftrace_max_lock); |
70 | 71 | ||
71 | cnt = ring_buffer_entries(tr->buffer); | 72 | cnt = ring_buffer_entries(tr->buffer); |
72 | 73 | ||
@@ -84,7 +85,7 @@ static int trace_test_buffer(struct trace_array *tr, unsigned long *count) | |||
84 | break; | 85 | break; |
85 | } | 86 | } |
86 | tracing_on(); | 87 | tracing_on(); |
87 | __raw_spin_unlock(&ftrace_max_lock); | 88 | arch_spin_unlock(&ftrace_max_lock); |
88 | local_irq_restore(flags); | 89 | local_irq_restore(flags); |
89 | 90 | ||
90 | if (count) | 91 | if (count) |
@@ -808,3 +809,57 @@ trace_selftest_startup_hw_branches(struct tracer *trace, | |||
808 | return ret; | 809 | return ret; |
809 | } | 810 | } |
810 | #endif /* CONFIG_HW_BRANCH_TRACER */ | 811 | #endif /* CONFIG_HW_BRANCH_TRACER */ |
812 | |||
813 | #ifdef CONFIG_KSYM_TRACER | ||
814 | static int ksym_selftest_dummy; | ||
815 | |||
816 | int | ||
817 | trace_selftest_startup_ksym(struct tracer *trace, struct trace_array *tr) | ||
818 | { | ||
819 | unsigned long count; | ||
820 | int ret; | ||
821 | |||
822 | /* start the tracing */ | ||
823 | ret = tracer_init(trace, tr); | ||
824 | if (ret) { | ||
825 | warn_failed_init_tracer(trace, ret); | ||
826 | return ret; | ||
827 | } | ||
828 | |||
829 | ksym_selftest_dummy = 0; | ||
830 | /* Register the read-write tracing request */ | ||
831 | |||
832 | ret = process_new_ksym_entry("ksym_selftest_dummy", | ||
833 | HW_BREAKPOINT_R | HW_BREAKPOINT_W, | ||
834 | (unsigned long)(&ksym_selftest_dummy)); | ||
835 | |||
836 | if (ret < 0) { | ||
837 | printk(KERN_CONT "ksym_trace read-write startup test failed\n"); | ||
838 | goto ret_path; | ||
839 | } | ||
840 | /* Perform a read and a write operation over the dummy variable to | ||
841 | * trigger the tracer | ||
842 | */ | ||
843 | if (ksym_selftest_dummy == 0) | ||
844 | ksym_selftest_dummy++; | ||
845 | |||
846 | /* stop the tracing. */ | ||
847 | tracing_stop(); | ||
848 | /* check the trace buffer */ | ||
849 | ret = trace_test_buffer(tr, &count); | ||
850 | trace->reset(tr); | ||
851 | tracing_start(); | ||
852 | |||
853 | /* read & write operations - one each is performed on the dummy variable | ||
854 | * triggering two entries in the trace buffer | ||
855 | */ | ||
856 | if (!ret && count != 2) { | ||
857 | printk(KERN_CONT "Ksym tracer startup test failed"); | ||
858 | ret = -1; | ||
859 | } | ||
860 | |||
861 | ret_path: | ||
862 | return ret; | ||
863 | } | ||
864 | #endif /* CONFIG_KSYM_TRACER */ | ||
865 | |||