Re: [PATCH v7 12/21] RDMA/rw: drop pci_p2pdma_[un]map_sg()

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To: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Subject: Re: [PATCH v7 12/21] RDMA/rw: drop pci_p2pdma_[un]map_sg()
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 29 Jun 2022 08:42:48 +0200
Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-nvme@xxxxxxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-pci@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, Stephen Bates <sbates@xxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, Dan Williams <dan.j.williams@xxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxx>, Christian König <christian.koenig@xxxxxxx>, John Hubbard <jhubbard@xxxxxxxxxx>, Don Dutile <ddutile@xxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Daniel Vetter <daniel.vetter@xxxxxxxx>, Minturn Dave B <dave.b.minturn@xxxxxxxxx>, Jason Ekstrand <jason@xxxxxxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Xiong Jianxin <jianxin.xiong@xxxxxxxxx>, Bjorn Helgaas <helgaas@xxxxxxxxxx>, Ira Weiny <ira.weiny@xxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, Martin Oliveira <martin.oliveira@xxxxxxxxxxxxx>, Chaitanya Kulkarni <ckulkarnilinux@xxxxxxxxx>, Ralph Campbell <rcampbell@xxxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxxxx>
In-reply-to: <20220615161233.17527-13-logang@deltatee.com>
References: <20220615161233.17527-1-logang@deltatee.com> <20220615161233.17527-13-logang@deltatee.com>
User-agent: Mutt/1.5.17 (2007-11-01)

On Wed, Jun 15, 2022 at 10:12:24AM -0600, Logan Gunthorpe wrote:
> dma_map_sg() now supports the use of P2PDMA pages so pci_p2pdma_map_sg()
> is no longer necessary and may be dropped. This means the
> rdma_rw_[un]map_sg() helpers are no longer necessary. Remove it all.

Looks good:

Reviewed-by: Christoph Hellwig <hch@xxxxxx>

References:
- [PATCH v7 00/21] Userspace P2PDMA with O_DIRECT NVMe devices
  - From: Logan Gunthorpe
- [PATCH v7 12/21] RDMA/rw: drop pci_p2pdma_[un]map_sg()
  - From: Logan Gunthorpe

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