Commit 0b6e4d56 authored Oct 28, 2008 by Frederic Weisbecker Committed by Ingo Molnar Oct 28, 2008

ftrace: perform an initialization for ftrace to enable it



Impact: corrects a bug which made the non-dyn function tracer not functional

With latest git, the non-dynamic function tracer didn't get any trace.

The problem was the fact that ftrace_enabled wasn't initialized to 1
because ftrace hasn't any init function when DYNAMIC_FTRACE is disabled.

So when a tracer tries to register an ftrace_ops struct,
__register_ftrace_function failed to set the hook.

This patch corrects it by setting an init function to initialize
ftrace during the boot.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent e946217e

kernel/trace/ftrace.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -1339,6 +1339,14 @@ void __init ftrace_init(void)
		}

		#else

		static int __init ftrace_nodyn_init(void)
		{
		ftrace_enabled = 1;
		return 0;
		}
		device_initcall(ftrace_nodyn_init);

		# define ftrace_startup() do { } while (0)
		# define ftrace_shutdown() do { } while (0)
		# define ftrace_startup_sysctl() do { } while (0)