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    Subject[PATCHv6 0/4] tracing: function graph output for preempt/irqs-off tracers

    updates based on comments by Frederic Weisbecker,
    also rebase to latest master.

    I'm sending reworked version of the graph output support for
    preemptirqsoff/preemptoff/irqsoff tracers.

    - using stubs instead of ifdef in trace_irqsoff for graph
    tracer's calls

    - function graph events are back in game
    - changed function graph tracer interface to be able to
    pass custom tracer flags
    - changed calls to trace_function to trace graph records
    when the display-graph otion is enabled. As function tracer
    and graph tracer have different spacing during the record
    output, this way it looks better, and the info stays.

    This could be also done via TRACE_PRINT, then it'd be displayed
    as comment.. I chose the first way, though it could be easily

    - fixed header to display all the info as for
    current irqsoff tracer
    - fixed reset of the max_tr buffer during the
    display-graph switch

    - the function_graph tracer should have the same output
    as current version even with events enabled,
    unless I missed something again ;)
    - I gave up the idea of function_graph events,
    since it was unsuitable for outputing other
    events as comments "/* */"
    - I'm not including the raw function_graph for now

    attached patches:
    - 1/4 adding ftrace events for graph tracer
    - 2/4 graph tracer - adding support for passing flags to ouput functions
    - 3/4 graph output support for irqsoff tracer
    - 4/4 graph output support for preemptirqsoff/preemptoff tracers

    plz let me know what you think


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