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>
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@ -157,13 +157,6 @@ static struct page *balloon_retrieve(bool prefer_highmem)
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return page;
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}
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static struct page *balloon_first_page(void)
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{
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if (list_empty(&ballooned_pages))
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return NULL;
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return list_entry(ballooned_pages.next, struct page, lru);
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}
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static struct page *balloon_next_page(struct page *page)
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{
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struct list_head *next = page->lru.next;
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@ -328,7 +321,7 @@ static enum bp_state increase_reservation(unsigned long nr_pages)
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if (nr_pages > ARRAY_SIZE(frame_list))
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nr_pages = ARRAY_SIZE(frame_list);
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page = balloon_first_page();
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page = list_first_entry_or_null(&ballooned_pages, struct page, lru);
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for (i = 0; i < nr_pages; i++) {
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if (!page) {
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nr_pages = i;
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