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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>
This commit is contained in:
Jie Liu 2013-11-13 20:59:58 +08:00 committed by Konrad Rzeszutek Wilk
parent 02bcf053e9
commit 9346c2a8de
1 changed files with 1 additions and 8 deletions
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9
drivers/xen/balloon.c
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@ -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;