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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2017-03-03 13:37:33 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2017-03-24 13:08:43 -0400
commite725c731e3bb1e892e7b564c945b121cb41d1087 (patch)
tree90e6ebfbd020855bb1914a979fd78d4ef65b8b9d
parent97da3854c526d3a6ee05c849c96e48d21527606c (diff)
tracing: Split tracing initialization into two for early initialization
Create an early_trace_init() function that will initialize the buffers and allow for ealier use of trace_printk(). This will also allow for future work to have function tracing start earlier at boot up. Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
-rw-r--r--include/linux/ftrace.h2
-rw-r--r--init/main.c5
-rw-r--r--kernel/trace/trace.c6
3 files changed, 11 insertions, 2 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 3633e8beff39..569db5589851 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -42,8 +42,10 @@
/* Main tracing buffer and events set up */
#ifdef CONFIG_TRACING
void trace_init(void);
+void early_trace_init(void);
#else
static inline void trace_init(void) { }
+static inline void early_trace_init(void) { }
#endif
struct module;
diff --git a/init/main.c b/init/main.c
index f9c9d9948203..81a49e8d54cc 100644
--- a/init/main.c
+++ b/init/main.c
@@ -545,6 +545,9 @@ asmlinkage __visible void __init start_kernel(void)
trap_init();
mm_init();
+ /* trace_printk can be enabled here */
+ early_trace_init();
+
/*
* Set up the scheduler prior starting any interrupts (such as the
* timer interrupt). Full topology setup happens at smp_init()
@@ -570,7 +573,7 @@ asmlinkage __visible void __init start_kernel(void)
rcu_init();
- /* trace_printk() and trace points may be used after this */
+ /* Trace events are available after this */
trace_init();
context_tracking_init();
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index f35109514a01..6757561d9617 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -7999,7 +7999,7 @@ out:
return ret;
}
-void __init trace_init(void)
+void __init early_trace_init(void)
{
if (tracepoint_printk) {
tracepoint_print_iter =
@@ -8010,6 +8010,10 @@ void __init trace_init(void)
static_key_enable(&tracepoint_printk_key.key);
}
tracer_alloc_buffers();
+}
+
+void __init trace_init(void)
+{
trace_event_init();
}