From 79d3d667af401eaa452f046595209aae6933c485 Mon Sep 17 00:00:00 2001
From: Gary Guo <gary@garyguo.net>
Date: Tue, 9 Jun 2026 16:38:37 +0100
Subject: [PATCH] rust: sync: Add helpers for mb, dma_mb and friends

They supplement the existing smp_mb, smp_rmb and smp_wmb.

Reviewed-by: Eliot Courtney <ecourtney@nvidia.com>
Signed-off-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Boqun Feng <boqun@kernel.org>
Link: https://patch.msgid.link/20260609-rust-barrier-v2-1-30fcc48e1cd0@garyguo.net
---
 rust/helpers/barrier.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/rust/helpers/barrier.c b/rust/helpers/barrier.c
index fed8853745c8..dbc7a3017c78 100644
--- a/rust/helpers/barrier.c
+++ b/rust/helpers/barrier.c
@@ -2,6 +2,36 @@
 
 #include <asm/barrier.h>
 
+__rust_helper void rust_helper_mb(void)
+{
+	mb();
+}
+
+__rust_helper void rust_helper_rmb(void)
+{
+	rmb();
+}
+
+__rust_helper void rust_helper_wmb(void)
+{
+	wmb();
+}
+
+__rust_helper void rust_helper_dma_mb(void)
+{
+	dma_mb();
+}
+
+__rust_helper void rust_helper_dma_rmb(void)
+{
+	dma_rmb();
+}
+
+__rust_helper void rust_helper_dma_wmb(void)
+{
+	dma_wmb();
+}
+
 __rust_helper void rust_helper_smp_mb(void)
 {
 	smp_mb();