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    Subject[PATCH 5.5 226/257] ftrace/kprobe: Show the maxactive number on kprobe_events
    Date
    From: Masami Hiramatsu <mhiramat@kernel.org>

    commit 6a13a0d7b4d1171ef9b80ad69abc37e1daa941b3 upstream.

    Show maxactive parameter on kprobe_events.
    This allows user to save the current configuration and
    restore it without losing maxactive parameter.

    Link: http://lkml.kernel.org/r/4762764a-6df7-bc93-ed60-e336146dce1f@gmail.com
    Link: http://lkml.kernel.org/r/158503528846.22706.5549974121212526020.stgit@devnote2

    Cc: stable@vger.kernel.org
    Fixes: 696ced4fb1d76 ("tracing/kprobes: expose maxactive for kretprobe in kprobe_events")
    Reported-by: Taeung Song <treeze.taeung@gmail.com>
    Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
    Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    kernel/trace/trace_kprobe.c | 2 ++
    1 file changed, 2 insertions(+)

    --- a/kernel/trace/trace_kprobe.c
    +++ b/kernel/trace/trace_kprobe.c
    @@ -918,6 +918,8 @@ static int trace_kprobe_show(struct seq_
    int i;

    seq_putc(m, trace_kprobe_is_return(tk) ? 'r' : 'p');
    + if (trace_kprobe_is_return(tk) && tk->rp.maxactive)
    + seq_printf(m, "%d", tk->rp.maxactive);
    seq_printf(m, ":%s/%s", trace_probe_group_name(&tk->tp),
    trace_probe_name(&tk->tp));


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