linux-kernel - [PATCH v2 05/10] tracing: Make printk

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Message-ID: <20260208032450.144525891@kernel.org>
Date: Sat, 07 Feb 2026 22:24:22 -0500
From: Steven Rostedt <rostedt@...nel.org>
To: linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v2 05/10] tracing: Make printk_trace global for tracing system

From: Steven Rostedt <rostedt@...dmis.org>

The printk_trace is used to determine which trace_array trace_printk()
writes to. By making it a global variable among the tracing subsystem it
will allow the trace_printk functions to be moved out of trace.c and still
have direct access to that variable.

Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/trace.c | 2 +-
 kernel/trace/trace.h | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index a515b5241391..4a73822e2603 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -534,7 +534,7 @@ static struct trace_array global_trace = {
 	.trace_flags = TRACE_DEFAULT_FLAGS,
 };
 
-static struct trace_array *printk_trace = &global_trace;
+struct trace_array *printk_trace = &global_trace;
 
 /* List of trace_arrays interested in the top level trace_marker */
 static LIST_HEAD(marker_copies);
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 605ee23f3262..921e4daa2825 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -482,6 +482,8 @@ extern bool trace_clock_in_ns(struct trace_array *tr);
 
 extern unsigned long trace_adjust_address(struct trace_array *tr, unsigned long addr);
 
+extern struct trace_array *printk_trace;
+
 /*
  * The global tracer (top) should be the first trace array added,
  * but we check the flag anyway.
-- 
2.51.0