Re: [PATCH v2] mm: Cleanup __put_devmap_managed_page() vs ->page_free()

+ if (count > 1) { + /* still busy */ + return; + } else if (count == 0) { + /* only triggered by the dev_pagemap shutdown path */ + __put_page(page); + return; + } else if (!is_device_private_page(page)) { + /* notify page idle for dax */ + wake_up_var(&page->_refcount); + return; + }