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tracing: Consolidate trace_add/remove_event_call back to the nolock functions

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The trace_add/remove_event_call_nolock() functions were added to allow
the tace_add/remove_event_call() code be called when the event_mutex
lock was already taken. Now that all callers are done within the
event_mutex, there's no reason to have two different interfaces.

Remove the current wrapper trace_add/remove_event_call()s and rename the
_nolock versions back to the original names.

Link: http://lkml.kernel.org/r/154140866955.17322.2081425494660638846.stgit@devbox

Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2018-12-04 13:35:45 -05:00
parent 0e2b81f7b5
commit 7e1413edd6
5 changed files with 11 additions and 35 deletions
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2
include/linux/trace_events.h
View file

@ -529,8 +529,6 @@ extern int trace_event_raw_init(struct trace_event_call *call);
extern int trace_define_field(struct trace_event_call *call, const char *type,
const char *name, int offset, int size,
int is_signed, int filter_type);
extern int trace_add_event_call_nolock(struct trace_event_call *call);
extern int trace_remove_event_call_nolock(struct trace_event_call *call);
extern int trace_add_event_call(struct trace_event_call *call);
extern int trace_remove_event_call(struct trace_event_call *call);
extern int trace_event_get_offsets(struct trace_event_call *call);

30
kernel/trace/trace_events.c
View file

@ -2305,7 +2305,8 @@ __trace_early_add_new_event(struct trace_event_call *call,
struct ftrace_module_file_ops;
static void __add_event_to_tracers(struct trace_event_call *call);
int trace_add_event_call_nolock(struct trace_event_call *call)
/* Add an additional event_call dynamically */
int trace_add_event_call(struct trace_event_call *call)
{
int ret;
lockdep_assert_held(&event_mutex);
@ -2320,17 +2321,6 @@ int trace_add_event_call_nolock(struct trace_event_call *call)
return ret;
}
/* Add an additional event_call dynamically */
int trace_add_event_call(struct trace_event_call *call)
{
int ret;
mutex_lock(&event_mutex);
ret = trace_add_event_call_nolock(call);
mutex_unlock(&event_mutex);
return ret;
}
/*
* Must be called under locking of trace_types_lock, event_mutex and
* trace_event_sem.
@ -2376,8 +2366,8 @@ static int probe_remove_event_call(struct trace_event_call *call)
return 0;
}
/* no event_mutex version */
int trace_remove_event_call_nolock(struct trace_event_call *call)
/* Remove an event_call */
int trace_remove_event_call(struct trace_event_call *call)
{
int ret;
@ -2392,18 +2382,6 @@ int trace_remove_event_call_nolock(struct trace_event_call *call)
return ret;
}
/* Remove an event_call */
int trace_remove_event_call(struct trace_event_call *call)
{
int ret;
mutex_lock(&event_mutex);
ret = trace_remove_event_call_nolock(call);
mutex_unlock(&event_mutex);
return ret;
}
#define for_each_event(event, start, end) \
for (event = start; \
(unsigned long)event < (unsigned long)end; \

6
kernel/trace/trace_events_hist.c
View file

@ -960,7 +960,7 @@ static int register_synth_event(struct synth_event *event)
call->data = event;
call->tp = event->tp;
ret = trace_add_event_call_nolock(call);
ret = trace_add_event_call(call);
if (ret) {
pr_warn("Failed to register synthetic event: %s\n",
trace_event_name(call));
@ -969,7 +969,7 @@ static int register_synth_event(struct synth_event *event)
ret = set_synth_event_print_fmt(call);
if (ret < 0) {
trace_remove_event_call_nolock(call);
trace_remove_event_call(call);
goto err;
}
out:
@ -984,7 +984,7 @@ static int unregister_synth_event(struct synth_event *event)
struct trace_event_call *call = &event->call;
int ret;
ret = trace_remove_event_call_nolock(call);
ret = trace_remove_event_call(call);
return ret;
}

4
kernel/trace/trace_kprobe.c
View file

@ -1353,7 +1353,7 @@ static int register_kprobe_event(struct trace_kprobe *tk)
kfree(call->print_fmt);
return -ENODEV;
}
ret = trace_add_event_call_nolock(call);
ret = trace_add_event_call(call);
if (ret) {
pr_info("Failed to register kprobe event: %s\n",
trace_event_name(call));
@ -1368,7 +1368,7 @@ static int unregister_kprobe_event(struct trace_kprobe *tk)
int ret;
/* tp->event is unregistered in trace_remove_event_call() */
ret = trace_remove_event_call_nolock(&tk->tp.call);
ret = trace_remove_event_call(&tk->tp.call);
if (!ret)
kfree(tk->tp.call.print_fmt);
return ret;

4
kernel/trace/trace_uprobe.c
View file

@ -1320,7 +1320,7 @@ static int register_uprobe_event(struct trace_uprobe *tu)
return -ENODEV;
}
ret = trace_add_event_call_nolock(call);
ret = trace_add_event_call(call);
if (ret) {
pr_info("Failed to register uprobe event: %s\n",
@ -1337,7 +1337,7 @@ static int unregister_uprobe_event(struct trace_uprobe *tu)
int ret;
/* tu->event is unregistered in trace_remove_event_call() */
ret = trace_remove_event_call_nolock(&tu->tp.call);
ret = trace_remove_event_call(&tu->tp.call);
if (ret)
return ret;
kfree(tu->tp.call.print_fmt);