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Date:   Wed, 20 Feb 2019 07:10:56 -0800
From:   Christoph Hellwig <hch@infradead.org>
To:     Thomas Bogendoerfer <tbogendoerfer@suse.de>
Cc:     Christoph Hellwig <hch@infradead.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
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        Ralf Baechle <ralf@linux-mips.org>
Subject: Re: [PATCH 6/7] MIPS: SGI-IP27: use generic PCI driver
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On Mon, Feb 18, 2019 at 11:58:07AM +0100, Thomas Bogendoerfer wrote:
> This of course will break SH7786. To fix both cases how about making dma_pfn_offset
>
> a signed long ?

Yes, making it signed sounds like a good idea.