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

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Date:   Mon, 15 Jul 2019 14:11:20 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Tim Bird <Tim.Bird@...y.com>
Cc:     Ingo Molnar <mingo@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: [RFC PATCH v2 01/15] tracing: Apply soft-disabled and filter to tracepoints printk

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 <mhiramat@...nel.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);