commit 43a15386c4faf913f7d70a47748c266d6210cd6e
author Frédéric Weisbecker <fweisbec@gmail.com> Sun Sep 21 20:16:30 2008 +0200
committer Ingo Molnar <mingo@elte.hu> Tue Oct 14 10:38:09 2008 +0200
tree 2af766a34661123bd520fb30b1f83fbff1e65dab
parent 2a3a4f669df2164288d11406d11d5e4933bf5e53

tracing/ftrace: replace none tracer by nop tracer

Replace "none" tracer by the recently created "nop" tracer.
Both are pretty similar except that nop accepts TRACE_PRINT
or TRACE_SPECIAL entries.

And as a consequence, changing the size of the ring buffer now
requires that tracing has already been disabled.

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

kernel/trace/trace.h

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index c8c6870..cb2c3fb 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -369,4 +369,6 @@
 	TRACE_ITER_PRINTK		= 0x400,
 };
 
+extern struct tracer nop_trace;
+
 #endif /* _LINUX_KERNEL_TRACE_H */