From: Steven Rostedt <srostedt@redhat.com>
Date: Mon, 12 May 2008 19:20:45 +0000 (+0200)
Subject: ftrace: reset selftests
X-Git-Tag: v2.6.27-rc1~1102^2^2~1^2~124
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1d4db00a5e30c7b8f8dc2a1b19e886fd942be143;p=linux-2.6

ftrace: reset selftests

The tests may leave stuff in the buffers. This resets the buffers
after each test is run. If a test fails, it does not reset the
buffer to avoid touching a buffer that is corrupted.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8755a43704..6580e7ed04 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -289,6 +289,13 @@ int register_tracer(struct tracer *type)
 			printk(KERN_CONT "FAILED!\n");
 			goto out;
 		}
+		/* Only reset on passing, to avoid touching corrupted buffers */
+		for_each_possible_cpu(i) {
+			data = tr->data[i];
+			if (!head_page(data))
+				continue;
+			tracing_reset(data);
+		}
 		printk(KERN_CONT "PASSED\n");
 	}
 #endif