linux-kernel - Re: [PATCH] iommu/vt-d: Return the correct dma mask when we are bypassing the IOMMU

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Message-ID: <20191009065115.GB30157@lst.de>
Date:   Wed, 9 Oct 2019 08:51:15 +0200
From:   Christoph Hellwig <hch@....de>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>,
        linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] iommu/vt-d: Return the correct dma mask when we are
 bypassing the IOMMU

On Wed, Oct 09, 2019 at 10:45:15AM +0800, Lu Baolu wrote:
> Do you mind explaining why we always return 32 bit here?

See the comment in dma_get_required_mask().