function-graph: Allow writing the same val to set_graph_function
# echo 'do_open' > set_graph_function
# echo 'do_open' >> set_graph_function
bash: echo: write error: Invalid argument
Make it valid to write the same value to set_graph_function,
which is consistent with set_ftrace_filter interface.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
LKML-reference: <4B1DC4E1.1060303@cn.fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index ff8aecd..7968762 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2552,10 +2552,9 @@
exists = true;
break;
}
- if (!exists) {
+ if (!exists)
array[(*idx)++] = rec->ip;
- found = 1;
- }
+ found = 1;
}
} while_for_each_ftrace_rec();