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    Subject[PATCH 06/13] 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>
    ---
    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();

    --
    1.6.3


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