[RFC PATCH] nvmet-tcp: Don't kmap() pages which can't come from HIGHMEM

[Keith Busch]

On Wed, Aug 17, 2022 at 12:44:09PM +0300, Sagi Grimberg wrote:
> 
> > You should also remove the cmd's 'nr_mapped' field while you're at it,
> > otherwise you'll hit the WARN in nvmet_tcp_free_cmd_buffers().
> 
> Not remove nr_mapped because we use it to know the iovec entries, but
> we can just remove the WARN statement.

It's only used locally within nvmet_tcp_map_pdu_iovec() after this change, so
no need to carry it in struct nvmet_tcp_cmd anymore.