xen: simplify balloon_first_page() with list_first_entry_or_null()
Replace the code logic at balloon_first_page() by calling
list_first_entry_or_null() directly. since here is only
one user of that routine, therefore we can just remove it.
Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 4c02e2b..37d06ea 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -157,13 +157,6 @@
return page;
}
-static struct page *balloon_first_page(void)
-{
- if (list_empty(&ballooned_pages))
- return NULL;
- return list_entry(ballooned_pages.next, struct page, lru);
-}
-
static struct page *balloon_next_page(struct page *page)
{
struct list_head *next = page->lru.next;
@@ -328,7 +321,7 @@
if (nr_pages > ARRAY_SIZE(frame_list))
nr_pages = ARRAY_SIZE(frame_list);
- page = balloon_first_page();
+ page = list_first_entry_or_null(&ballooned_pages, struct page, lru);
for (i = 0; i < nr_pages; i++) {
if (!page) {
nr_pages = i;