[PATCH 04/11] iov_iter: explicitly check for CHECK_IOVEC_ONLY in rw_copy_check_uvector

[Al Viro]

On Mon, Sep 21, 2020 at 04:34:27PM +0200, Christoph Hellwig wrote:
> Explicitly check for the magic value insted of implicitly relying on
> its numeric representation.   Also drop the rather pointless unlikely
> annotation.

See above - I would rather have CHECK_IOVEC_ONLY gone.

The reason for doing these access_ok() in the same loop is fairly weak,
especially since you are checking type on each iteration.  Might as
well do that in a separate loop afterwards.