From: Tom Zanussi <zanussi@kernel.org>
To: rostedt@goodmis.org
Cc: artem.bityutskiy@linux.intel.com, mhiramat@kernel.org,
linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org
Subject: [PATCH v2 01/12] tracing: Add trace_array_find() to find instance trace arrays
Date: Fri, 10 Jan 2020 14:35:07 -0600
Message-ID: <24b84188ea96d0ffddfd803b567a536f3fb9577e.1578688120.git.zanussi@kernel.org> (raw)
In-Reply-To: <cover.1578688120.git.zanussi@kernel.org>
In-Reply-To: <cover.1578688120.git.zanussi@kernel.org>
Add a new trace_array_find() function that can be used to find a trace
array given the instance name, and replace existing code that does the
same thing with it.
Also make it available for use outside of trace.c.
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
---
kernel/trace/trace.c | 30 ++++++++++++++++++++----------
kernel/trace/trace.h | 1 +
2 files changed, 21 insertions(+), 10 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 23459d53d576..3da836ef23ee 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -8455,6 +8455,21 @@ static void update_tracer_options(struct trace_array *tr)
mutex_unlock(&trace_types_lock);
}
+/* Must have trace_types_lock held */
+struct trace_array *trace_array_find(const char *name)
+{
+ struct trace_array *tr, *found = NULL;
+
+ list_for_each_entry(tr, &ftrace_trace_arrays, list) {
+ if (tr->name && strcmp(tr->name, name) == 0) {
+ found = tr;
+ break;
+ }
+ }
+
+ return found;
+}
+
static struct trace_array *trace_array_create(const char *name)
{
struct trace_array *tr;
@@ -8531,10 +8546,8 @@ static int instance_mkdir(const char *name)
mutex_lock(&trace_types_lock);
ret = -EEXIST;
- list_for_each_entry(tr, &ftrace_trace_arrays, list) {
- if (tr->name && strcmp(tr->name, name) == 0)
- goto out_unlock;
- }
+ if (trace_array_find(name))
+ goto out_unlock;
tr = trace_array_create(name);
@@ -8658,12 +8671,9 @@ static int instance_rmdir(const char *name)
mutex_lock(&trace_types_lock);
ret = -ENODEV;
- list_for_each_entry(tr, &ftrace_trace_arrays, list) {
- if (tr->name && strcmp(tr->name, name) == 0) {
- ret = __remove_instance(tr);
- break;
- }
- }
+ tr = trace_array_find(name);
+ if (tr)
+ ret = __remove_instance(tr);
mutex_unlock(&trace_types_lock);
mutex_unlock(&event_mutex);
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 63bf60f79398..f37ef6524821 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -346,6 +346,7 @@ extern struct mutex trace_types_lock;
extern int trace_array_get(struct trace_array *tr);
extern int tracing_check_open_get_tr(struct trace_array *tr);
+extern struct trace_array *trace_array_find(const char *name);
extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs);
extern int tracing_set_clock(struct trace_array *tr, const char *clockstr);
--
2.14.1
next prev parent reply index
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-10 20:35 [PATCH v2 00/12] tracing: Add support for in-kernel dynamic event API Tom Zanussi
2020-01-10 20:35 ` Tom Zanussi [this message]
2020-01-10 20:35 ` [PATCH v2 02/12] tracing: Add get/put_event_file() Tom Zanussi
2020-01-13 13:15 ` Masami Hiramatsu
2020-01-13 15:15 ` Tom Zanussi
2020-01-10 20:35 ` [PATCH v2 03/12] tracing: Add delete_synth_event() Tom Zanussi
2020-01-10 20:35 ` [PATCH v2 04/12] tracing: Add dynamic event command creation interface Tom Zanussi
2020-01-14 12:14 ` Masami Hiramatsu
2020-01-14 15:19 ` Tom Zanussi
2020-01-10 20:35 ` [PATCH v2 05/12] tracing: Add synth_event_run_command() Tom Zanussi
2020-01-21 16:53 ` Steven Rostedt
2020-01-10 20:35 ` [PATCH v2 06/12] tracing: Add synthetic event command generation functions Tom Zanussi
2020-01-21 16:57 ` Steven Rostedt
2020-01-21 19:20 ` Tom Zanussi
2020-01-10 20:35 ` [PATCH v2 07/12] tracing: Add trace_synth_event() and related functions Tom Zanussi
2020-01-21 17:03 ` Steven Rostedt
2020-01-21 19:22 ` Tom Zanussi
2020-01-10 20:35 ` [PATCH v2 08/12] tracing: Add synth event generation test module Tom Zanussi
2020-01-10 20:35 ` [PATCH v2 09/12] tracing: Add trace_kprobe_run_command() Tom Zanussi
2020-01-10 20:35 ` [PATCH v2 10/12] tracing: Add kprobe event command generation functions Tom Zanussi
2020-01-10 20:35 ` [PATCH v2 11/12] tracing: Add kprobe event command generation test module Tom Zanussi
2020-01-10 20:35 ` [PATCH v2 12/12] tracing: Documentation for in-kernel synthetic event API Tom Zanussi
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