linux-kernel - Re: [PATCH v4 02/23] lib/scatterlist: add flag for indicating P2PDMA segments in an SGL

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Message-ID: <20211221090248.GB7949@lst.de>
Date:   Tue, 21 Dec 2021 10:02:48 +0100
From:   Christoph Hellwig <hch@....de>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-block@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-mm@...ck.org, iommu@...ts.linux-foundation.org,
        Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Christian König <christian.koenig@....com>,
        John Hubbard <jhubbard@...dia.com>,
        Don Dutile <ddutile@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Jakowski Andrzej <andrzej.jakowski@...el.com>,
        Minturn Dave B <dave.b.minturn@...el.com>,
        Jason Ekstrand <jason@...kstrand.net>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Xiong Jianxin <jianxin.xiong@...el.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Ira Weiny <ira.weiny@...el.com>,
        Robin Murphy <robin.murphy@....com>,
        Martin Oliveira <martin.oliveira@...eticom.com>,
        Chaitanya Kulkarni <ckulkarnilinux@...il.com>
Subject: Re: [PATCH v4 02/23] lib/scatterlist: add flag for indicating
 P2PDMA segments in an SGL

> +	#
> +	# The need for the scatterlist DMA bus address flag means PCI P2PDMA
> +	# requires 64bit
> +	#
> +	select NEED_SG_DMA_BUS_ADDR_FLAG

> +config NEED_SG_DMA_BUS_ADDR_FLAG
> +	depends on 64BIT
> +	bool

depends does not work for symbols that are selected using select.