tracing/kprobes: Do not open code event reserve logic

As kprobe events use trace_event_buffer_commit() to commit the event to
the ftrace ring buffer, for consistency, it should use
trace_event_buffer_reserve() to allocate it, as the two functions are
related.

Link: https://lkml.kernel.org/r/20211130024319.257430762@goodmis.orgAcked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

kernel/trace/trace_kprobe.c

@@ -1383,17 +1383,11 @@ __kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs,
 	if (trace_trigger_soft_disabled(trace_file))
 		return;
 
-	fbuffer.trace_ctx = tracing_gen_ctx();
-	fbuffer.trace_file = trace_file;
-
 	dsize = __get_data_size(&tk->tp, regs);
 
-	fbuffer.event =
-		trace_event_buffer_lock_reserve(&fbuffer.buffer, trace_file,
-					call->event.type,
-					sizeof(*entry) + tk->tp.size + dsize,
-					fbuffer.trace_ctx);
-	if (!fbuffer.event)
+	entry = trace_event_buffer_reserve(&fbuffer, trace_file,
+					   sizeof(*entry) + tk->tp.size + dsize);
+	if (!entry)
 		return;
 
 	fbuffer.regs = regs;
@@ -1430,16 +1424,11 @@ __kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
 	if (trace_trigger_soft_disabled(trace_file))
 		return;
 
-	fbuffer.trace_ctx = tracing_gen_ctx();
-	fbuffer.trace_file = trace_file;
-
 	dsize = __get_data_size(&tk->tp, regs);
-	fbuffer.event =
-		trace_event_buffer_lock_reserve(&fbuffer.buffer, trace_file,
-					call->event.type,
-					sizeof(*entry) + tk->tp.size + dsize,
-					fbuffer.trace_ctx);
-	if (!fbuffer.event)
+
+	entry = trace_event_buffer_reserve(&fbuffer, trace_file,
+					   sizeof(*entry) + tk->tp.size + dsize);
+	if (!entry)
 		return;
 
 	fbuffer.regs = regs;