Re: [PATCH v6 19/27] mm/filemap: Add __lock_folio_async

Looks good, Reviewed-by: Christoph Hellwig

[PATCH v6 19/27] mm/filemap: Add __lock_folio_async

There aren't any actual callers of lock_page_async(), so remove it. Convert filemap_update_page() to call __lock_folio_async(). __lock_folio_async() is 21 bytes smaller than __lock_page_async(), but the real savings come from using a folio in filemap_update_page(), shrinking it from 514 bytes to