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tracing: Do not create "enable" or "filter" files for ftrace event subsystem

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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>
This commit is contained in:
Steven Rostedt (VMware) 2021-02-05 18:04:39 -05:00
parent 4b9091e1c1
commit 2d396cb3b1
1 changed files with 13 additions and 9 deletions
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22
kernel/trace/trace_events.c
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@ -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) {
trace_create_file("enable", 0644, dir->entry, dir,
&ftrace_system_enable_fops);
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);
}
list_add(&dir->list, &tr->systems);