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Date:   Mon, 26 Aug 2019 09:33:20 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Masahiro Yamada <yamada.masahiro@socionext.com>
Cc:     Christoph Hellwig <hch@lst.de>,
        Nicolin Chen <nicoleotsuka@gmail.com>,
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Subject: Re: [PATCH v2 2/2] dma-contiguous: Use fallback alloc_pages for
 single pages
Message-ID: <20190826073320.GA11712@lst.de>
References: <20190506223334.1834-1-nicoleotsuka@gmail.com> <20190506223334.1834-3-nicoleotsuka@gmail.com> <CAK7LNARacEorb38mVBw_V-Zvz-znWgBma1AP1-z_5B_xZU4ogg@mail.gmail.com> <CAK7LNAQfYBCoChMV=MOwcUyVoqRkrPWs7DaWdzDqjBe18gGiAQ@mail.gmail.com> <20190825011025.GA23410@lst.de> <CAK7LNAQb1ZHr=DiHLNeNRaQExMuXdDOV4sFghoGbco_Q=Qzb8g@mail.gmail.com>
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On Mon, Aug 26, 2019 at 11:05:00AM +0900, Masahiro Yamada wrote:
> This is included in v5.3-rc6
> so I tested it.

So there is no allocation failure, but you get I/O errors later?

Does the device use a device-private CMA area?  Does it work with Linux
5.2 if CONFIG_DMA_CMA is disabled?