diff options
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 7a93c663e52..33549537f30 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -44,13 +44,14 @@ unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; unsigned long __read_mostly tracing_thresh; -/* We need to change this state when a selftest is running. +/* + * We need to change this state when a selftest is running. * A selftest will lurk into the ring-buffer to count the * entries inserted during the selftest although some concurrent * insertions into the ring-buffer such as ftrace_printk could occurred * at the same time, giving false positive or negative results. */ -static atomic_t tracing_selftest_running = ATOMIC_INIT(0); +static bool __read_mostly tracing_selftest_running; /* For tracers that don't implement custom flags */ static struct tracer_opt dummy_tracer_opt[] = { @@ -574,6 +575,8 @@ int register_tracer(struct tracer *type) unlock_kernel(); mutex_lock(&trace_types_lock); + tracing_selftest_running = true; + for (t = trace_types; t; t = t->next) { if (strcmp(type->name, t->name) == 0) { /* already found */ @@ -598,7 +601,6 @@ int register_tracer(struct tracer *type) struct trace_array *tr = &global_trace; int i; - atomic_set(&tracing_selftest_running, 1); /* * Run a selftest on this tracer. * Here we reset the trace buffer, and set the current @@ -613,7 +615,6 @@ int register_tracer(struct tracer *type) /* the test is responsible for initializing and enabling */ pr_info("Testing tracer %s: ", type->name); ret = type->selftest(type, tr); - atomic_set(&tracing_selftest_running, 0); /* the test is responsible for resetting too */ current_trace = saved_tracer; if (ret) { @@ -635,6 +636,7 @@ int register_tracer(struct tracer *type) max_tracer_type_len = len; out: + tracing_selftest_running = false; mutex_unlock(&trace_types_lock); lock_kernel(); @@ -3605,7 +3607,7 @@ int trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args) unsigned long flags, irq_flags; int cpu, len = 0, size, pc; - if (tracing_disabled || atomic_read(&tracing_selftest_running)) + if (tracing_disabled || tracing_selftest_running) return 0; pc = preempt_count(); |