tracing/selftest: Add a WARN_ON() if a tracer test fails

Add a WARN_ON() output on test failures so that they are easier to detect
in automated tests. Although, the WARN_ON() will not print if the test
causes the system to crash, obviously.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 49249c28690d..748f6401edf6 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -830,6 +830,8 @@ int register_tracer(struct tracer *type)
                 current_trace = saved_tracer;
                 if (ret) {
                         printk(KERN_CONT "FAILED!\n");
+                        /* Add the warning after printing 'FAILED' */
+                        WARN_ON(1);
                         goto out;
                 }
                 /* Only reset on passing, to avoid touching corrupted buffers */