linux-kernel - [PATCH v2 06/10] tracing: Make tracing_update_buffers() take NULL for global

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Message-ID: <20260208032450.318864210@kernel.org>
Date: Sat, 07 Feb 2026 22:24:23 -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 06/10] tracing: Make tracing_update_buffers() take NULL for global_trace

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

The trace.c file has become a dumping ground for all tracing code and has
become quite large. In order to move the trace_printk functions out of it
these functions can not access global_trace directly, as that is something
that needs to stay static in trace.c.

Have tracing_update_buffers() take NULL for its trace_array to denote it
should work on the global_trace top level trace_array allows that function
to be used outside of trace.c and still update the global_trace
trace_array.

Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/trace.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 4a73822e2603..601b6f622391 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3234,7 +3234,7 @@ void trace_printk_init_buffers(void)
 	pr_warn("**********************************************************\n");
 
 	/* Expand the buffers to set size */
-	if (tracing_update_buffers(&global_trace) < 0)
+	if (tracing_update_buffers(NULL) < 0)
 		pr_err("Failed to expand tracing buffers for trace_printk() calls\n");
 	else
 		buffers_allocated = 1;
@@ -6186,6 +6186,9 @@ int tracing_update_buffers(struct trace_array *tr)
 {
 	int ret = 0;
 
+	if (!tr)
+		tr = &global_trace;
+
 	guard(mutex)(&trace_types_lock);
 
 	update_last_data(tr);
-- 
2.51.0