linux-kernel - [PATCH] virtio_ring: sparse warning fixup

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200710104900.406084-1-mst@redhat.com>
Date:   Fri, 10 Jul 2020 06:49:01 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Jason Wang <jasowang@...hat.com>,
        virtualization@...ts.linux-foundation.org
Subject: [PATCH] virtio_ring: sparse warning fixup

virtio_store_mb was built with split ring in mind so it accepts
__virtio16 arguments. Packed ring uses __le16 values, so sparse
complains.  It's just a store with some barriers so let's convert it to
a macro, we don't loose too much type safety by doing that.

Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 include/linux/virtio_ring.h | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
index 3dc70adfe5f5..b485b13fa50b 100644
--- a/include/linux/virtio_ring.h
+++ b/include/linux/virtio_ring.h
@@ -46,16 +46,15 @@ static inline void virtio_wmb(bool weak_barriers)
 		dma_wmb();
 }
 
-static inline void virtio_store_mb(bool weak_barriers,
-				   __virtio16 *p, __virtio16 v)
-{
-	if (weak_barriers) {
-		virt_store_mb(*p, v);
-	} else {
-		WRITE_ONCE(*p, v);
-		mb();
-	}
-}
+#define virtio_store_mb(weak_barriers, p, v) \
+do { \
+	if (weak_barriers) { \
+		virt_store_mb(*p, v); \
+	} else { \
+		WRITE_ONCE(*p, v); \
+		mb(); \
+	} \
+} while (0) \
 
 struct virtio_device;
 struct virtqueue;
-- 
MST