From: Jie Liu <jeff.liu@oracle.com>
Date: Wed, 13 Nov 2013 12:59:58 +0000 (+0800)
Subject: xen: simplify balloon_first_page() with list_first_entry_or_null()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9346c2a8defab777d1fba6bcc284f6ada181fe96;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

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 4c02e2b94103..37d06ea624aa 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -157,13 +157,6 @@ static struct page *balloon_retrieve(bool prefer_highmem)
 	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 @@ static enum bp_state increase_reservation(unsigned long nr_pages)
 	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;