diff mbox series

[RFC,v3,05/19] tracing: Apply soft-disabled and filter to tracepoints printk

Message ID 156678939711.21459.14981591663181807734.stgit@devnote2 (mailing list archive)
State New, archived
Headers show
Series tracing: skc: Boot-time tracing and Supplemental Kernel Cmdline | expand

Commit Message

Masami Hiramatsu (Google) Aug. 26, 2019, 3:16 a.m. UTC 
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@kernel.org>
---
 kernel/trace/trace.c |    7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 525a97fbbc60..ead3a9faa584 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);