Commit 91baf628 authored Dec 08, 2009 by Li Zefan Committed by Frederic Weisbecker Dec 13, 2009

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>

parent 313254a9

kernel/trace/ftrace.c

+2 −3

Original line number	Original line	Diff line number	Diff line
	@@ -2552,11 +2552,10 @@ ftrace_set_func(unsigned long array, int idx, char *buffer)
	exists = true;		exists = true;
	break;		break;
	}		}
	if (!exists) {		if (!exists)
	array[(*idx)++] = rec->ip;		array[(*idx)++] = rec->ip;
	found = 1;		found = 1;
	}		}
	}
	} while_for_each_ftrace_rec();		} while_for_each_ftrace_rec();

	mutex_unlock(&ftrace_lock);		mutex_unlock(&ftrace_lock);