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virtio: rename 'pagesize' arg to vring_init/vring_size

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It's really the alignment desired for consumer/producer separation;
historically this x86 pagesize, but with PowerPC it'll still be x86
pagesize.  And in theory lguest could choose a different value.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2008-12-30 09:25:57 -06:00
parent 480daab42c
commit 5f0d1d7f22
1 changed files with 6 additions and 6 deletions
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12
include/linux/virtio_ring.h
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@ -83,7 +83,7 @@ struct vring {
* __u16 avail_idx;
* __u16 available[num];
*
* // Padding to the next page boundary.
* // Padding to the next align boundary.
* char pad[];
*
* // A ring of used descriptor heads with free-running index.
@ -93,19 +93,19 @@ struct vring {
* };
*/
static inline void vring_init(struct vring *vr, unsigned int num, void *p,
unsigned long pagesize)
unsigned long align)
{
vr->num = num;
vr->desc = p;
vr->avail = p + num*sizeof(struct vring_desc);
vr->used = (void *)(((unsigned long)&vr->avail->ring[num] + pagesize-1)
& ~(pagesize - 1));
vr->used = (void *)(((unsigned long)&vr->avail->ring[num] + align-1)
& ~(align - 1));
}
static inline unsigned vring_size(unsigned int num, unsigned long pagesize)
static inline unsigned vring_size(unsigned int num, unsigned long align)
{
return ((sizeof(struct vring_desc) * num + sizeof(__u16) * (2 + num)
+ pagesize - 1) & ~(pagesize - 1))
+ align - 1) & ~(align - 1))
+ sizeof(__u16) * 2 + sizeof(struct vring_used_elem) * num;
}