[for-next][PATCH 07/26] tracing: toplevel d_entry already initialized

Steven Rostedt
2020-09-22T01:26:37Z

From: Wei Yang <richard.weiyang@linux.alibaba.com>

Currently we have following call flow:

tracer_init_tracefs()
tracing_init_dentry()
event_trace_init()
tracing_init_dentry()

This shows tracing_init_dentry() is called twice in this flow and this
is not necessary.

Let's remove the second one when it is for sure be properly initialized.

Link: https://lkml.kernel.org/r/20200712011036.70948-4-richard.weiyang@linux.alibaba.com

Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/trace/trace_events.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index a85effb2373b..ee25d849ebba 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -3434,7 +3434,6 @@ early_initcall(event_trace_enable_again);
__init int event_trace_init(void)
{
struct trace_array *tr;
- struct dentry *d_tracer;
struct dentry *entry;
int ret;

@@ -3442,11 +3441,7 @@ __init int event_trace_init(void)
if (!tr)
return -ENODEV;

- d_tracer = tracing_init_dentry();
- if (IS_ERR(d_tracer))
- return 0;
-
- entry = tracefs_create_file("available_events", 0444, d_tracer,
+ entry = tracefs_create_file("available_events", 0444, NULL,
tr, &ftrace_avail_fops);
if (!entry)
pr_warn("Could not create tracefs 'available_events' entry\n");
@@ -3457,7 +3452,7 @@ __init int event_trace_init(void)
if (trace_define_common_fields())
pr_warn("tracing: Failed to allocate common fields");

- ret = early_event_add_tracer(d_tracer, tr);
+ ret = early_event_add_tracer(NULL, tr);
if (ret)
return ret;

--
2.28.0