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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2021-02-05 18:04:39 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2021-02-05 18:04:39 -0500
commit2d396cb3b12641adcde91104a7c89994f2e876a6 (patch)
treecfbb3b68e841e1e4c78bc983c45f37a396ba1aa8 /kernel/trace
parent4b9091e1c1948dea3b0b097496f308ede897d665 (diff)
tracing: Do not create "enable" or "filter" files for ftrace event subsystem
The ftrace event subsystem is only created for showing the format files of events created by the ftrace tracers, and are not trace events. The ftrace subsystem currently has both the "enable" and "filter" files that in other subsystems are used to enable/disable all events within the subsystem or set a filter for all the subsystem events. As ftrace subsystem events do not use enable or filter operations, these files are useless in the ftrace subsystem. Remove them. Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/trace_events.c22
1 files changed, 13 insertions, 9 deletions
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 20ccce3e4ffb..c1e90611fe22 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -2097,16 +2097,20 @@ event_subsystem_dir(struct trace_array *tr, const char *name,
dir->subsystem = system;
file->system = dir;
- entry = tracefs_create_file("filter", 0644, dir->entry, dir,
- &ftrace_subsystem_filter_fops);
- if (!entry) {
- kfree(system->filter);
- system->filter = NULL;
- pr_warn("Could not create tracefs '%s/filter' entry\n", name);
- }
+ /* the ftrace system is special, do not create enable or filter files */
+ if (strcmp(name, "ftrace") != 0) {
+
+ entry = tracefs_create_file("filter", 0644, dir->entry, dir,
+ &ftrace_subsystem_filter_fops);
+ if (!entry) {
+ kfree(system->filter);
+ system->filter = NULL;
+ pr_warn("Could not create tracefs '%s/filter' entry\n", name);
+ }
- trace_create_file("enable", 0644, dir->entry, dir,
- &ftrace_system_enable_fops);
+ trace_create_file("enable", 0644, dir->entry, dir,
+ &ftrace_system_enable_fops);
+ }
list_add(&dir->list, &tr->systems);