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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>
This commit is contained in:
Li Zefan 2009-12-08 11:15:45 +08:00 committed by Frederic Weisbecker
parent 313254a940
commit 91baf6285b
1 changed files with 2 additions and 3 deletions
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5
kernel/trace/ftrace.c
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@ -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();