From 65772b7cafa41a20966fe9e708ab83dbfa4602b4 Mon Sep 17 00:00:00 2001
From: Taylor R Campbell <riastradh@NetBSD.org>
Date: Tue, 19 Jul 2022 16:46:45 +0000
Subject: [PATCH] linux: Add alpha definitions of mb/wmb/rmb too for fun.

Who wants to plug an amdgpu into their alpha?
---
 sys/external/bsd/common/include/asm/barrier.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sys/external/bsd/common/include/asm/barrier.h b/sys/external/bsd/common/include/asm/barrier.h
index 958cf358cc57..73b26fd97659 100644
--- a/sys/external/bsd/common/include/asm/barrier.h
+++ b/sys/external/bsd/common/include/asm/barrier.h
@@ -82,6 +82,11 @@
 #define	mb()	wbflush()
 #define	wmb()	mb()
 #define	rmb()	mb()
+#elif defined(__alpha__)
+#include <machine/alpha_cpu.h>
+#define	mb()	alpha_mb()
+#define	wmb()	alpha_wmb()
+#define	rmb()	mb()
 #else
 #error Missing Linux memory-mapped I/O barriers for this architecture.
 #endif