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Date:   Mon, 9 Nov 2020 10:12:58 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Logan Gunthorpe <logang@deltatee.com>
Cc:     linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
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        Don Dutile <ddutile@redhat.com>,
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Subject: Re: [RFC PATCH 04/15] lib/scatterlist: Add flag for indicating
 P2PDMA segments in an SGL
Message-ID: <20201109091258.GB28918@lst.de>
References: <20201106170036.18713-1-logang@deltatee.com> <20201106170036.18713-5-logang@deltatee.com>
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On Fri, Nov 06, 2020 at 10:00:25AM -0700, Logan Gunthorpe wrote:
> We make use of the top bit of the dma_length to indicate a P2PDMA
> segment.

I don't think "we" can.  There is nothing limiting the size of a SGL
segment.