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


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