[PATCH] page migration cleanup: drop nr_refs in remove_references()

/*

 * Remove references for a page and establish the new page with the correct

 * basic settings to be able to stop accesses to the page.

 *

 * The number of remaining references must be:

 * 1 for anonymous pages without a mapping

 * 2 for pages with a mapping

 * 3 for pages with a mapping and PagePrivate set.

 */

static int migrate_page_remove_references(struct page *newpage,

				struct page *page, int nr_refs)

				struct page *page)

{

	struct address_space *mapping = page_mapping(page);

	struct page **radix_pointer;

	/*

	 * Avoid doing any of the following work if the page count

	 * indicates that the page is in use or truncate has removed

	 * the page.

	 */

	if (!mapping || page_mapcount(page) + nr_refs != page_count(page))

	if (!mapping)

		return -EAGAIN;

	/*

						&mapping->page_tree,

						page_index(page));

	if (!page_mapping(page) || page_count(page) != nr_refs ||

	if (!page_mapping(page) ||

			page_count(page) != 2 + !!PagePrivate(page) ||

			*radix_pointer != page) {

		write_unlock_irq(&mapping->tree_lock);

		return -EAGAIN;

	BUG_ON(PageWriteback(page));	/* Writeback must be complete */

	rc = migrate_page_remove_references(newpage, page, 2);

	rc = migrate_page_remove_references(newpage, page);

	if (rc)

		return rc;

	head = page_buffers(page);

	rc = migrate_page_remove_references(newpage, page, 3);

	rc = migrate_page_remove_references(newpage, page);

	if (rc)

		return rc;