Re: [PATCH 26/27] iov_iter: add import_kvec()

[Al Viro]

On Fri, Nov 30, 2018 at 09:56:45AM -0700, Jens Axboe wrote:
> This explicitly sets up an ITER_KVEC from an iovec with kernel ranges
> mapped.

> +int import_kvec(int type, const struct kvec *kvecs, unsigned nr_segs,
> +             size_t bytes, struct iov_iter *iter)
> +{
> +     const struct iovec *p = (const struct iovec *) kvecs;
> +
> +     iov_iter_init_type(iter, ITER_KVEC, type, p, nr_segs, bytes);
> +     return 0;
> +}

What the hell is wrong with existing iov_iter_kvec()?