linux-kernel - [PATCH] virtio, ring: Use ALIGN macros in virtio

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Date:	Tue, 26 Apr 2011 12:11:10 +0800
From:	Liu Yuan <namei.unix@...il.com>
To:	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: [PATCH] virtio, ring: Use ALIGN macros in virtio_ring.h

From: Liu Yuan <tailai.ly@...bao.com>


Signed-off-by: Liu Yuan <tailai.ly@...bao.com>
---
 include/linux/virtio_ring.h |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
index e4d144b..6299050 100644
--- a/include/linux/virtio_ring.h
+++ b/include/linux/virtio_ring.h
@@ -99,15 +99,13 @@ static inline void vring_init(struct vring *vr, unsigned int num, void *p,
 	vr->num = num;
 	vr->desc = p;
 	vr->avail = p + num*sizeof(struct vring_desc);
-	vr->used = (void *)(((unsigned long)&vr->avail->ring[num] + align-1)
-			    & ~(align - 1));
+	vr->used = (void *)PTR_ALIGN(&vr->avail->ring[num], align);
 }
 
 static inline unsigned vring_size(unsigned int num, unsigned long align)
 {
-	return ((sizeof(struct vring_desc) * num + sizeof(__u16) * (2 + num)
-		 + align - 1) & ~(align - 1))
-		+ sizeof(__u16) * 2 + sizeof(struct vring_used_elem) * num;
+	return ((sizeof(struct vring_desc) * num + ALIGN(sizeof(__u16) * (2 + num), align))
+		+ sizeof(__u16) * 2 + sizeof(struct vring_used_elem) * num);
 }
 
 #ifdef __KERNEL__
-- 
1.7.1

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