linux-kernel - [PATCH] virtio: Change typecasts in vring

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Date:   Tue, 27 Aug 2019 15:20:57 +0000
From:   Matej Genci <matej.genci@...anix.com>
To:     "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "mst@...hat.com" <mst@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Matej Genci <matej.genci@...anix.com>
Subject: [PATCH] virtio: Change typecasts in vring_init()

Compilers such as g++ 7.3 complain about assigning void* variable to
a non-void* variable (like struct pointers) and pointer arithmetics
on void*.

Signed-off-by: Matej Genci <matej.genci@...anix.com>
---
 include/uapi/linux/virtio_ring.h | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/include/uapi/linux/virtio_ring.h b/include/uapi/linux/virtio_ring.h
index 4c4e24c291a5..2c339b9e2923 100644
--- a/include/uapi/linux/virtio_ring.h
+++ b/include/uapi/linux/virtio_ring.h
@@ -168,10 +168,11 @@ static inline void vring_init(struct vring *vr, unsigned int num, void *p,
 			      unsigned long align)
 {
 	vr->num = num;
-	vr->desc = p;
-	vr->avail = p + num*sizeof(struct vring_desc);
-	vr->used = (void *)(((uintptr_t)&vr->avail->ring[num] + sizeof(__virtio16)
-		+ align-1) & ~(align - 1));
+	vr->desc = (struct vring_desc *)p;
+	vr->avail = (struct vring_avail *)((uintptr_t)p
+		+ num*sizeof(struct vring_desc));
+	vr->used = (struct vring_used *)(((uintptr_t)&vr->avail->ring[num]
+		+ sizeof(__virtio16) + align-1) & ~(align - 1));
 }
 
 static inline unsigned vring_size(unsigned int num, unsigned long align)
-- 
2.22.0