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

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Message-ID: <20200908161307.GL9166@nvidia.com>
Date:   Tue, 8 Sep 2020 13:13:07 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Christoph Hellwig <hch@....de>
CC:     Maor Gottlieb <maorg@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        Doug Ledford <dledford@...hat.com>,
        <linux-kernel@...r.kernel.org>, <linux-rdma@...r.kernel.org>
Subject: Re: [PATCH rdma-next 3/4] lib/scatterlist: Add support in dynamic
 allocation of SG table from pages

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.

Jason