[tip:tracing/urgent] function-graph: Allow writing the same val to set_graph_function

[tip-bot for Li Zefan <lizf@cn.fujitsu.com>]

Commit-ID:  91baf6285be7282cfa487de92f836c50749dffb9
Gitweb:     http://git.kernel.org/tip/91baf6285be7282cfa487de92f836c50749dffb9
Author:     Li Zefan <lizf@cn.fujitsu.com>
AuthorDate: Tue, 8 Dec 2009 11:15:45 +0800
Committer:  Frederic Weisbecker <fweisbec@gmail.com>
CommitDate: Sun, 13 Dec 2009 18:37:26 +0100

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>
---
 kernel/trace/ftrace.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

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 @@ ftrace_set_func(unsigned long *array, int *idx, char *buffer)
 					exists = true;
 					break;
 				}
-			if (!exists) {
+			if (!exists)
 				array[(*idx)++] = rec->ip;
-				found = 1;
-			}
+			found = 1;
 		}
 	} while_for_each_ftrace_rec();