Re: [PATCH 3/9] fs: explicitly check for CHECK_IOVEC_ONLY in rw_copy_check_uvector

[Matthew Wilcox]

On Fri, Sep 18, 2020 at 02:45:27PM +0200, Christoph Hellwig wrote:
>  		}
> -		if (type >= 0
> -		    && unlikely(!access_ok(buf, len))) {
> +		if (type != CHECK_IOVEC_ONLY && unlikely(!access_ok(buf, len))) {

drop the unlikely() at the same time?  if it's really advantageous,
that should be embedded in the access_ok macro.