Re: [PATCH rdma-next 3/4] lib/scatterlist: Add support in dynamic allocation of SG table from pages

From: Jason Gunthorpe
Date: Tue Sep 08 2020 - 13:51:23 EST

On Tue, Sep 08, 2020 at 05:54:09PM +0200, Christoph Hellwig wrote:
> Given that ARCH_NO_SG_CHAIN is only true for alpha, parisc and a few
> arm subarchitectures I think just not supporting umem is probably
> cleared. And eventually we'll need to drop ARCH_NO_SG_CHAIN entirely.

It would be fine to make INFINIBAND_USER_MEM depend on
!ARCH_NO_SG_CHAIN. alpha and parisc are not supported in rdma-core,
and the non-multiplatform ARM sub-arches are probably also the kind
that don't work with the userspace DMA model anyhow.