[RFC PATCH v2 04/15] tracing: kprobes: Register to dynevent earlier stage

[Masami Hiramatsu]

Register kprobe event to dynevent in subsys_initcall level.
This will allow kernel to register new kprobe events in
fs_initcall level via trace_run_command.

Signed-off-by: Masami Hiramatsu <mhira...@kernel.org>
---
 kernel/trace/trace_kprobe.c |   19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 6c5145525f90..5135c07b6557 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1484,11 +1484,12 @@ static __init void setup_boot_kprobe_events(void)
        enable_boot_kprobe_events();
 }
 
-/* Make a tracefs interface for controlling probe points */
-static __init int init_kprobe_trace(void)
+/*
+ * Register dynevent at subsys_initcall. This allows kernel to setup kprobe
+ * events in fs_initcall without tracefs.
+ */
+static __init int init_kprobe_trace_early(void)
 {
-       struct dentry *d_tracer;
-       struct dentry *entry;
        int ret;
 
        ret = dyn_event_register(&trace_kprobe_ops);
@@ -1498,6 +1499,16 @@ static __init int init_kprobe_trace(void)
        if (register_module_notifier(&trace_kprobe_module_nb))
                return -EINVAL;
 
+       return 0;
+}
+subsys_initcall(init_kprobe_trace_early);
+
+/* Make a tracefs interface for controlling probe points */
+static __init int init_kprobe_trace(void)
+{
+       struct dentry *d_tracer;
+       struct dentry *entry;
+
        d_tracer = tracing_init_dentry();
        if (IS_ERR(d_tracer))
                return 0;