[tip: locking/core] rust: sync: Add helpers for mb, dma_mb and friends

["tip-bot2 for Gary Guo" <tip-bot2@linutronix.de>]

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     79d3d667af401eaa452f046595209aae6933c485
Gitweb:        https://git.kernel.org/tip/79d3d667af401eaa452f046595209aae6933c485
Author:        Gary Guo <gary@garyguo.net>
AuthorDate:    Tue, 09 Jun 2026 16:38:37 +01:00
Committer:     Boqun Feng <boqun@kernel.org>
CommitterDate: Tue, 04 Aug 2026 05:52:54 -07:00

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 fed8853..dbc7a30 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();