[RFC PATCH v2 01/15] tracing: Apply soft-disabled and filter to tracepoints printk

[Masami Hiramatsu]

Apply soft-disabled and the filter rule of the trace events to
the printk output of tracepoints (a.k.a. tp_printk kernel parameter)
as same as trace buffer output.

Signed-off-by: Masami Hiramatsu <mhira...@kernel.org>
---
 kernel/trace/trace.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 6b62e1718548..047f37816bf1 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2502,6 +2502,7 @@ static DEFINE_MUTEX(tracepoint_printk_mutex);
 static void output_printk(struct trace_event_buffer *fbuffer)
 {
        struct trace_event_call *event_call;
+       struct trace_event_file *file;
        struct trace_event *event;
        unsigned long flags;
        struct trace_iterator *iter = tracepoint_print_iter;
@@ -2515,6 +2516,12 @@ static void output_printk(struct trace_event_buffer 
*fbuffer)
            !event_call->event.funcs->trace)
                return;
 
+       file = fbuffer->trace_file;
+       if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) ||
+           (unlikely(file->flags & EVENT_FILE_FL_FILTERED) &&
+            !filter_match_preds(file->filter, fbuffer->entry)))
+               return;
+
        event = &fbuffer->trace_file->event_call->event;
 
        spin_lock_irqsave(&tracepoint_iter_lock, flags);