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>

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>
Li Zefan · Frederic Weisbecker
1 parent 313254a940
Showing 1 changed file with 2 additions and 3 deletions Side-by-side Diff
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();
...	...	@@ -2552,10 +2552,9 @@
2552	2552	exists = true;
2553	2553	break;
2554	2554	}
2555		- if (!exists) {
	2555	+ if (!exists)
2556	2556	array[(*idx)++] = rec->ip;
2557		- found = 1;
2558		- }
	2557	+ found = 1;
2559	2558	}
2560	2559	} while_for_each_ftrace_rec();
2561	2560