linux-kernel - [for-next][PATCH 07/15] tracing: Check the return value of tracing_update

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Message-ID: <20260127150612.459344562@kernel.org>
Date: Tue, 27 Jan 2026 10:06:02 -0500
From: Steven Rostedt <rostedt@...nel.org>
To: linux-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>,
 Li Zhong <floridsleeves@...il.com>
Subject: [for-next][PATCH 07/15] tracing: Check the return value of tracing_update_buffers()

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

In the very unlikely event that tracing_update_buffers() fails in
trace_printk_init_buffers(), report the failure so that it is known.

Link: https://lore.kernel.org/all/20220917020353.3836285-1-floridsleeves@gmail.com/

Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Link: https://patch.msgid.link/20260107161510.4dc98b15@gandalf.local.home
Suggested-by: Li Zhong <floridsleeves@...il.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/trace.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8bd4ec08fb36..870205cba31e 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3309,9 +3309,10 @@ void trace_printk_init_buffers(void)
 	pr_warn("**********************************************************\n");
 
 	/* Expand the buffers to set size */
-	tracing_update_buffers(&global_trace);
-
-	buffers_allocated = 1;
+	if (tracing_update_buffers(&global_trace) < 0)
+		pr_err("Failed to expand tracing buffers for trace_printk() calls\n");
+	else
+		buffers_allocated = 1;
 
 	/*
 	 * trace_printk_init_buffers() can be called by modules.
-- 
2.51.0