tracing/ftrace: don't insert TRACE_PRINT during selftests

Impact: fix tracer selfstests false results

After setting a ftrace_printk somewhere in th kernel, I saw the
Function tracer selftest failing.

When a selftest occurs, the ring buffer is lurked to see if
some entries were inserted. But concurrent insertion such as
ftrace_printk could occured at the same time and could give
false positive or negative results.

This patch prevent prevent from TRACE_PRINT entries insertion
during selftests.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 12 insertions, 1 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index ea38652d631..5dca6ef1fbe 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -44,6 +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.
+ * 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);
+
 /* For tracers that don't implement custom flags */
 static struct tracer_opt dummy_tracer_opt[] = {
         { }
@@ -589,6 +597,8 @@ int register_tracer(struct tracer *type)
                 struct tracer *saved_tracer = current_trace;
                 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
@@ -603,6 +613,7 @@ 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) {
@@ -3594,7 +3605,7 @@ 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)
+        if (tracing_disabled || atomic_read(&tracing_selftest_running))
                 return 0;
 
         pc = preempt_count();