fgraph: Remove redundant ftrace_graph_notrace_addr() test

We already have tested it before. The second one should be removed.
With this change, the performance should have little improvement.

Link: http://lkml.kernel.org/r/20190730140850.7927-1-changbin.du@gmail.com
Cc: stable@vger.kernel.org
Fixes: 9cd2992f2d6c ("fgraph: Have set_graph_notrace only affect function_graph tracer")
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 69ebf3c..78af971 100644 (file)
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -137,6 +137,13 @@ int trace_graph_entry(struct ftrace_graph_ent *trace)
        if (trace_recursion_test(TRACE_GRAPH_NOTRACE_BIT))
                return 0;
 
+       /*
+        * Do not trace a function if it's filtered by set_graph_notrace.
+        * Make the index of ret stack negative to indicate that it should
+        * ignore further functions.  But it needs its own ret stack entry
+        * to recover the original index in order to continue tracing after
+        * returning from the function.
+        */
        if (ftrace_graph_notrace_addr(trace->func)) {
                trace_recursion_set(TRACE_GRAPH_NOTRACE_BIT);
                /*
@@ -156,16 +163,6 @@ int trace_graph_entry(struct ftrace_graph_ent *trace)
                return 0;
 
        /*
-        * Do not trace a function if it's filtered by set_graph_notrace.
-        * Make the index of ret stack negative to indicate that it should
-        * ignore further functions.  But it needs its own ret stack entry
-        * to recover the original index in order to continue tracing after
-        * returning from the function.
-        */
-       if (ftrace_graph_notrace_addr(trace->func))
-               return 1;
-
-       /*
         * Stop here if tracing_threshold is set. We only write function return
         * events to the ring buffer.
         */