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Date:   Fri, 14 May 2021 15:51:26 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Logan Gunthorpe <logang@deltatee.com>
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Subject: Re: [PATCH v2 08/22] dma-mapping: Allow map_sg() ops to return
 negative error codes
Message-ID: <20210514135126.GB4715@lst.de>
References: <20210513223203.5542-1-logang@deltatee.com> <20210513223203.5542-9-logang@deltatee.com>
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> +int __dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, int nents,
>  		enum dma_data_direction dir, unsigned long attrs);

I don't think it makes sense to expose this __dma_map_sg_attrs helper.
Just keep it static and move the sgtable helper to kernel/dma/mapping.c
as well.