linux-kernel - fix x86 swiotlb regression

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Message-Id: <20180409091517.6619-1-hch@lst.de>
Date:   Mon,  9 Apr 2018 11:15:16 +0200
From:   Christoph Hellwig <hch@....de>
To:     iommu@...ts.linux-foundation.org
Cc:     Dominik Brodowski <linux@...inikbrodowski.net>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: fix x86 swiotlb regression

Hi all,

this patch fixes a regression in the x86 swiotlb conversion.  This mostly
happend because swiotlb_dma_support does the wrong thing (and did so for
a long time) and we switched x86 to use it.

There are a few others users of swiotlb_dma_supported that also look
rather broken, but I'll take care of those for the next merge window.