--- /dev/null
+From 31c683967174b487939efaf65e41f5ff1404e141 Mon Sep 17 00:00:00 2001
+From: "Steven Rostedt (Google)" <rostedt@goodmis.org>
+Date: Thu, 6 Apr 2023 11:10:33 -0400
+Subject: tracing/synthetic: Make lastcmd_mutex static
+
+From: Steven Rostedt (Google) <rostedt@goodmis.org>
+
+commit 31c683967174b487939efaf65e41f5ff1404e141 upstream.
+
+The lastcmd_mutex is only used in trace_events_synth.c and should be
+static.
+
+Link: https://lore.kernel.org/linux-trace-kernel/202304062033.cRStgOuP-lkp@intel.com/
+Link: https://lore.kernel.org/linux-trace-kernel/20230406111033.6e26de93@gandalf.local.home
+
+Cc: Masami Hiramatsu <mhiramat@kernel.org>
+Cc: Mark Rutland <mark.rutland@arm.com>
+Cc: Tze-nan Wu <Tze-nan.Wu@mediatek.com>
+Fixes: 4ccf11c4e8a8e ("tracing/synthetic: Fix races on freeing last_cmd")
+Reviewed-by: Mukesh Ojha <quic_mojha@quicinc.com>
+Reported-by: kernel test robot <lkp@intel.com>
+Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ kernel/trace/trace_events_synth.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/kernel/trace/trace_events_synth.c
++++ b/kernel/trace/trace_events_synth.c
+@@ -44,7 +44,7 @@ enum { ERRORS };
+
+ static const char *err_text[] = { ERRORS };
+
+-DEFINE_MUTEX(lastcmd_mutex);
++static DEFINE_MUTEX(lastcmd_mutex);
+ static char *last_cmd;
+
+ static int errpos(const char *str)