mm: remove put_page_unless_one()

	return atomic_inc_not_zero(&page->_count);

}

/*

 * Try to drop a ref unless the page has a refcount of one, return false if

 * that is the case.

 * This is to make sure that the refcount won't become zero after this drop.

 * This can be called when MMU is off so it must not access

 * any of the virtual mappings.

 */

static inline int put_page_unless_one(struct page *page)

{

	return atomic_add_unless(&page->_count, -1, 1);

}

extern int page_is_ram(unsigned long pfn);

extern int region_is_ram(resource_size_t phys_addr, unsigned long size);