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>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 49249c2..748f640 100644 (file)
--- 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 */