From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH] drm/amdgpu: replace readq/writeq with atomic64 operations
Date: Wed, 7 Aug 2019 00:08:34 -0700
Message-ID: <20190807070834.GA24792@infradead.org>
References: <20190807025640.682-1-tao.zhou1@amd.com>
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To: Tao Zhou <tao.zhou1@amd.com>
Cc: linux-arm-kernel@lists.infradead.org, kernel-build-reports@lists.linaro.org, amd-gfx@lists.freedesktop.org, broonie@kernel.org, linux-next@vger.kernel.org, alexander.deucher@amd.com, akpm@linux-foundation.org, christian.koenig@amd.com, dennis.li@amd.com, hawking.zhang@amd.com
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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.