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    Subject[PATCH V6 08/15] ftrace: Add perf text poke events for ftrace trampolines
    Date
    Add perf text poke events for ftrace trampolines when created and when
    freed.

    Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
    ---
    kernel/trace/ftrace.c | 14 ++++++++++++++
    1 file changed, 14 insertions(+)

    diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
    index 398d58b8ffa5..3318f7eca76c 100644
    --- a/kernel/trace/ftrace.c
    +++ b/kernel/trace/ftrace.c
    @@ -2792,6 +2792,13 @@ static void ftrace_trampoline_free(struct ftrace_ops *ops)
    {
    if (ops && (ops->flags & FTRACE_OPS_FL_ALLOC_TRAMP) &&
    ops->trampoline) {
    + /*
    + * Record the text poke event before the ksymbol unregister
    + * event.
    + */
    + perf_event_text_poke((void *)ops->trampoline,
    + (void *)ops->trampoline,
    + ops->trampoline_size, NULL, 0);
    perf_event_ksymbol(PERF_RECORD_KSYMBOL_TYPE_OOL,
    ops->trampoline, ops->trampoline_size,
    true, FTRACE_TRAMPOLINE_SYM);
    @@ -6816,6 +6823,13 @@ static void ftrace_update_trampoline(struct ftrace_ops *ops)
    perf_event_ksymbol(PERF_RECORD_KSYMBOL_TYPE_OOL,
    ops->trampoline, ops->trampoline_size, false,
    FTRACE_TRAMPOLINE_SYM);
    + /*
    + * Record the perf text poke event after the ksymbol register
    + * event.
    + */
    + perf_event_text_poke((void *)ops->trampoline, NULL, 0,
    + (void *)ops->trampoline,
    + ops->trampoline_size);
    }
    }

    --
    2.17.1
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