linux-kernel - [PATCH v3 23/38] virtio_config: cread/write cleanup

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Date:   Wed, 5 Aug 2020 09:44:18 -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 v3 23/38] virtio_config: cread/write cleanup

Use vars of the correct type instead of casting.

Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 include/linux/virtio_config.h | 31 +++++++++++++++++++------------
 1 file changed, 19 insertions(+), 12 deletions(-)

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index c68f58f3bf34..5c3b02245ecd 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -444,53 +444,60 @@ static inline void virtio_cwrite8(struct virtio_device *vdev,
 static inline u16 virtio_cread16(struct virtio_device *vdev,
 				 unsigned int offset)
 {
-	u16 ret;
+	__virtio16 ret;
 
 	might_sleep();
 	vdev->config->get(vdev, offset, &ret, sizeof(ret));
-	return virtio16_to_cpu(vdev, (__force __virtio16)ret);
+	return virtio16_to_cpu(vdev, ret);
 }
 
 static inline void virtio_cwrite16(struct virtio_device *vdev,
 				   unsigned int offset, u16 val)
 {
+	__virtio16 v;
+
 	might_sleep();
-	val = (__force u16)cpu_to_virtio16(vdev, val);
-	vdev->config->set(vdev, offset, &val, sizeof(val));
+	v = cpu_to_virtio16(vdev, val);
+	vdev->config->set(vdev, offset, &v, sizeof(v));
 }
 
 static inline u32 virtio_cread32(struct virtio_device *vdev,
 				 unsigned int offset)
 {
-	u32 ret;
+	__virtio32 ret;
 
 	might_sleep();
 	vdev->config->get(vdev, offset, &ret, sizeof(ret));
-	return virtio32_to_cpu(vdev, (__force __virtio32)ret);
+	return virtio32_to_cpu(vdev, ret);
 }
 
 static inline void virtio_cwrite32(struct virtio_device *vdev,
 				   unsigned int offset, u32 val)
 {
+	__virtio32 v;
+
 	might_sleep();
-	val = (__force u32)cpu_to_virtio32(vdev, val);
-	vdev->config->set(vdev, offset, &val, sizeof(val));
+	v = cpu_to_virtio32(vdev, val);
+	vdev->config->set(vdev, offset, &v, sizeof(v));
 }
 
 static inline u64 virtio_cread64(struct virtio_device *vdev,
 				 unsigned int offset)
 {
-	u64 ret;
+	__virtio64 ret;
+
 	__virtio_cread_many(vdev, offset, &ret, 1, sizeof(ret));
-	return virtio64_to_cpu(vdev, (__force __virtio64)ret);
+	return virtio64_to_cpu(vdev, ret);
 }
 
 static inline void virtio_cwrite64(struct virtio_device *vdev,
 				   unsigned int offset, u64 val)
 {
+	__virtio64 v;
+
 	might_sleep();
-	val = (__force u64)cpu_to_virtio64(vdev, val);
-	vdev->config->set(vdev, offset, &val, sizeof(val));
+	v = cpu_to_virtio64(vdev, val);
+	vdev->config->set(vdev, offset, &v, sizeof(v));
 }
 
 /* Conditional config space accessors. */
-- 
MST