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Date:   Wed, 7 Aug 2019 00:08:34 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Tao Zhou <tao.zhou1@amd.com>
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Subject: Re: [PATCH] drm/amdgpu: replace readq/writeq with atomic64 operations
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On Wed, Aug 07, 2019 at 10:56:40AM +0800, Tao Zhou wrote:
> readq/writeq are not supported on all architectures

NAK.  You must not use atomic_* on __iomem (MMIO) memory.