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    Subject[PATCH 7/8] tracing/events: add export symbols for trace events in modules
    From: Steven Rostedt <srostedt@redhat.com>

    Impact: let modules add trace events

    The trace event code requires some functions to be exported to allow
    modules to use TRACE_EVENT. This patch adds EXPORT_SYMBOL_GPL to the
    necessary functions.

    Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
    ---
    kernel/trace/trace.c | 3 +++
    kernel/trace/trace_events.c | 1 +
    kernel/trace/trace_events_filter.c | 2 ++
    kernel/trace/trace_output.c | 3 +++
    4 files changed, 9 insertions(+), 0 deletions(-)

    diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
    index c0047fc..2d69b26 100644
    --- a/kernel/trace/trace.c
    +++ b/kernel/trace/trace.c
    @@ -176,6 +176,7 @@ int filter_current_check_discard(struct ftrace_event_call *call, void *rec,
    {
    return filter_check_discard(call, rec, global_trace.buffer, event);
    }
    +EXPORT_SYMBOL_GPL(filter_current_check_discard);

    cycle_t ftrace_now(int cpu)
    {
    @@ -886,6 +887,7 @@ trace_current_buffer_lock_reserve(unsigned char type, unsigned long len,
    return trace_buffer_lock_reserve(&global_trace,
    type, len, flags, pc);
    }
    +EXPORT_SYMBOL(trace_current_buffer_lock_reserve);

    void trace_current_buffer_unlock_commit(struct ring_buffer_event *event,
    unsigned long flags, int pc)
    @@ -903,6 +905,7 @@ void trace_current_buffer_discard_commit(struct ring_buffer_event *event)
    {
    ring_buffer_discard_commit(global_trace.buffer, event);
    }
    +EXPORT_SYMBOL_GPL(trace_nowake_buffer_unlock_commit);

    void
    trace_function(struct trace_array *tr,
    diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
    index 5c66aaf..8b9e621 100644
    --- a/kernel/trace/trace_events.c
    +++ b/kernel/trace/trace_events.c
    @@ -53,6 +53,7 @@ err:

    return -ENOMEM;
    }
    +EXPORT_SYMBOL_GPL(trace_define_field);

    static void ftrace_clear_events(void)
    {
    diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
    index d30b06b..f8e5eab 100644
    --- a/kernel/trace/trace_events_filter.c
    +++ b/kernel/trace/trace_events_filter.c
    @@ -110,6 +110,7 @@ int filter_match_preds(struct ftrace_event_call *call, void *rec)

    return 1;
    }
    +EXPORT_SYMBOL_GPL(filter_match_preds);

    void filter_print_preds(struct filter_pred **preds, int n_preds,
    struct trace_seq *s)
    @@ -220,6 +221,7 @@ oom:

    return -ENOMEM;
    }
    +EXPORT_SYMBOL_GPL(init_preds);

    void filter_free_subsystem_preds(struct event_subsystem *system)
    {
    diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
    index 0e70fb0..83a8abb 100644
    --- a/kernel/trace/trace_output.c
    +++ b/kernel/trace/trace_output.c
    @@ -94,6 +94,7 @@ trace_seq_printf(struct trace_seq *s, const char *fmt, ...)

    return len;
    }
    +EXPORT_SYMBOL_GPL(trace_seq_printf);

    int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
    {
    @@ -538,6 +539,7 @@ int register_ftrace_event(struct trace_event *event)

    return ret;
    }
    +EXPORT_SYMBOL_GPL(register_ftrace_event);

    /**
    * unregister_ftrace_event - remove a no longer used event
    @@ -551,6 +553,7 @@ int unregister_ftrace_event(struct trace_event *event)

    return 0;
    }
    +EXPORT_SYMBOL_GPL(unregister_ftrace_event);

    /*
    * Standard events
    --
    1.6.2.1
    --


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