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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2014-12-13 04:05:10 +0300
committerSteven Rostedt <rostedt@goodmis.org>2014-12-15 18:16:50 +0300
commit5f893b2639b21ffe6834b1aebba392c37d2b83f9 (patch)
treeaff7db6baf3dd393a4791f2106ebacbe02b1ae5b /include/linux/ftrace.h
parentaee4e5f3d3abb7a2239dd02f6d8fb173413fd02f (diff)
downloadlinux-5f893b2639b21ffe6834b1aebba392c37d2b83f9.tar.xz
tracing: Move enabling tracepoints to just after rcu_init()
Enabling tracepoints at boot up can be very useful. The tracepoint can be initialized right after RCU has been. There's no need to wait for the early_initcall() to be called. That's too late for some things that can use tracepoints for debugging. Move the logic to enable tracepoints out of the initcalls and into init/main.c to right after rcu_init(). This also allows trace_printk() to be used early too. Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1412121539300.16494@nanos Link: http://lkml.kernel.org/r/20141214164104.307127356@goodmis.org Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Suggested-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/ftrace.h')
-rw-r--r--include/linux/ftrace.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index ed501953f0b2..f4bc14b7d444 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -39,6 +39,12 @@
# define FTRACE_FORCE_LIST_FUNC 0
#endif
+/* Main tracing buffer and events set up */
+#ifdef CONFIG_TRACING
+void trace_init(void);
+#else
+static inline void trace_init(void) { }
+#endif
struct module;
struct ftrace_hash;