iov: Add iov_init() helper

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

page-pipe.c

@@ -19,6 +19,12 @@ static inline bool iov_grow_page(struct iovec *iov, unsigned long addr)
 	return false;
 }
 
+static inline void iov_init(struct iovec *iov, unsigned long addr)
+{
+	iov->iov_base = (void *)addr;
+	iov->iov_len = PAGE_SIZE;
+}
+
 static int page_pipe_grow(struct page_pipe *pp)
 {
 	struct page_pipe_buf *ppb;
@@ -150,9 +156,7 @@ static inline int try_add_page_to(struct page_pipe *pp, struct page_pipe_buf *pp
 
 	pr_debug("Add iov to page pipe (%u iovs, %u/%u total)\n",
 			ppb->nr_segs, pp->free_iov, pp->nr_iovs);
-	ppb->iov[ppb->nr_segs].iov_base = (void *)addr;
-	ppb->iov[ppb->nr_segs].iov_len = PAGE_SIZE;
-	ppb->nr_segs++;
+	iov_init(&ppb->iov[ppb->nr_segs++], addr);
 	pp->free_iov++;
 	BUG_ON(pp->free_iov > pp->nr_iovs);
 out:
@@ -187,8 +191,6 @@ int page_pipe_add_page(struct page_pipe *pp, unsigned long addr)
 
 int page_pipe_add_hole(struct page_pipe *pp, unsigned long addr)
 {
-	struct iovec *iov;
-
 	if (pp->free_hole >= pp->nr_holes) {
 		pp->holes = xrealloc(pp->holes,
 				(pp->nr_holes + PP_HOLES_BATCH) * sizeof(struct iovec));
@@ -202,10 +204,7 @@ int page_pipe_add_hole(struct page_pipe *pp, unsigned long addr)
 			iov_grow_page(&pp->holes[pp->free_hole - 1], addr))
 		goto out;
 
-	iov = &pp->holes[pp->free_hole];
-	iov->iov_base = (void *)addr;
-	iov->iov_len = PAGE_SIZE;
-	pp->free_hole++;
+	iov_init(&pp->holes[pp->free_hole++], addr);
 out:
 	return 0;
 }