From d632f88e20cc0a43f9e0d82bac2a231198590927 Mon Sep 17 00:00:00 2001
From: Jung-uk Kim <jkim@FreeBSD.org>
Date: Thu, 15 Aug 2019 16:04:22 +0000
Subject: [PATCH] Enable ACPICA mutex debugging in INVARIANTS case.

This lets us detect lock order reversal in ACPICA code to avoid deadlock.
---
 sys/contrib/dev/acpica/include/platform/acfreebsd.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys/contrib/dev/acpica/include/platform/acfreebsd.h b/sys/contrib/dev/acpica/include/platform/acfreebsd.h
index aaeecfb3cfa7..46de7c830bed 100644
--- a/sys/contrib/dev/acpica/include/platform/acfreebsd.h
+++ b/sys/contrib/dev/acpica/include/platform/acfreebsd.h
@@ -203,6 +203,10 @@
 
 #define DEBUGGER_THREADING  0   /* integrated with DDB */
 
+#ifdef INVARIANTS
+#define ACPI_MUTEX_DEBUG
+#endif
+
 #else /* _KERNEL */
 
 #if __STDC_HOSTED__