Use new return type vm_fault_t for page_mkwrite,
pfn_mkwrite and fault handler.
Signed-off-by: NSouptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: NMatthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: NJan Kara <jack@suse.cz>