[tip:perf/core] tracing/selftest: Add a WARN_ON() if a tracer test fails

[tip-bot for Steven Rostedt <srostedt@xxxxxxxxxx>]

Commit-ID:  0be61ebc18b919dddbdbcd1c4f42513c310ecf59
Gitweb:     http://git.kernel.org/tip/0be61ebc18b919dddbdbcd1c4f42513c310ecf59
Author:     Steven Rostedt <srostedt@xxxxxxxxxx>
AuthorDate: Mon, 18 Jun 2012 09:28:16 -0400
Committer:  Steven Rostedt <rostedt@xxxxxxxxxxx>
CommitDate: Thu, 28 Jun 2012 13:52:14 -0400

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@xxxxxxxxxxx>
---
 kernel/trace/trace.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

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