function_graph: Have profiler use curr_ret_stack and not depth

commit b1b35f2e218a5b57d03bbc3b0667d5064570dc60 upstream.

The profiler uses trace->depth to find its entry on the ret_stack, but the
depth may not match the actual location of where its entry is (if an
interrupt were to preempt the processing of the profiler for another
function, the depth and the curr_ret_stack will be different).

Have it use the curr_ret_stack as the index to find its ret_stack entry
instead of using the depth variable, as that is no longer guaranteed to be
the same.

Cc: stable@kernel.org
Fixes: 03274a3f ("tracing/fgraph: Adjust fgraph depth before calling trace return callback")
Reviewed-by: NMasami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: NSteven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

kernel/trace/ftrace.c

@@ -817,7 +817,7 @@ function_profile_call(unsigned long ip, unsigned long parent_ip,
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 static int profile_graph_entry(struct ftrace_graph_ent *trace)
 {
-	int index = trace->depth;
+	int index = current->curr_ret_stack;
 
 	function_profile_call(trace->func, 0, NULL, NULL);
 
@@ -852,7 +852,7 @@ static void profile_graph_return(struct ftrace_graph_ret *trace)
 	if (!fgraph_graph_time) {
 		int index;
 
-		index = trace->depth;
+		index = current->curr_ret_stack;
 
 		/* Append this call time to the parent time to subtract */
 		if (index)