From: Wei Yang <richard.weiyang@linux.alibaba.com>
To: rostedt@goodmis.org, mingo@redhat.com
Cc: linux-kernel@vger.kernel.org,
Wei Yang <richard.weiyang@linux.alibaba.com>
Subject: [PATCH 4/5] tracing: use NULL directly to create root level tracefs
Date: Fri, 3 Jul 2020 10:06:11 +0800 [thread overview]
Message-ID: <20200703020612.12930-4-richard.weiyang@linux.alibaba.com> (raw)
In-Reply-To: <20200703020612.12930-1-richard.weiyang@linux.alibaba.com>
tracing_init_dentry() has two types of return value:
* NULL if succeed
* IS_ERR() if failed
If the function return error, the following check would return from the
function. So we are sure d_tracer passed in here is NULL.
This is a preparation for following cleanup.
Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
---
kernel/trace/trace_events.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index f6f55682d3e2..8b3aa57dcea6 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -3446,7 +3446,7 @@ __init int event_trace_init(void)
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 +3457,7 @@ __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;
--
2.20.1 (Apple Git-117)
next prev parent reply other threads:[~2020-07-03 2:06 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-03 2:06 [PATCH 1/5] tracing: use union to simplify the trace_event_functions initialization Wei Yang
2020-07-03 2:06 ` [PATCH 2/5] tracing: simplify the logic by defining next to be "lasst + 1" Wei Yang
2020-07-09 21:59 ` Steven Rostedt
2020-07-03 2:06 ` [PATCH 3/5] tracing: save one trace_event->type by using __TRACE_LAST_TYPE Wei Yang
2020-07-09 22:04 ` Steven Rostedt
2020-07-03 2:06 ` Wei Yang [this message]
2020-07-03 2:06 ` [PATCH 5/5] tracing: toplevel d_entry already initialized Wei Yang
2020-07-09 22:13 ` Steven Rostedt
2020-07-10 1:11 ` Wei Yang
2020-07-10 13:08 ` Steven Rostedt
2020-07-09 21:57 ` [PATCH 1/5] tracing: use union to simplify the trace_event_functions initialization Steven Rostedt
2020-07-10 1:10 ` Wei Yang
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