On Mon, Sep 21, 2020 at 04:34:28PM +0200, Christoph Hellwig wrote: > +static int compat_copy_iovecs_from_user(struct iovec *iov, > + const struct iovec __user *uvector, unsigned long nr_segs) > +{ > + const struct compat_iovec __user *uiov = > + (const struct compat_iovec __user *)uvector; > + unsigned long i; ^^^^ Huh?