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    SubjectRe: [PATCH 01/11] iommu: Add device dma ownership set/release interfaces
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    Hi Christoph,

    On 11/15/21 9:14 PM, Christoph Hellwig wrote:
    > On Mon, Nov 15, 2021 at 10:05:42AM +0800, Lu Baolu wrote:
    >> +enum iommu_dma_owner {
    >> + DMA_OWNER_NONE,
    >> + DMA_OWNER_KERNEL,
    >> + DMA_OWNER_USER,
    >> +};
    >> +
    >
    >> + enum iommu_dma_owner dma_owner;
    >> + refcount_t owner_cnt;
    >> + struct file *owner_user_file;
    >
    > I'd just overload the ownership into owner_user_file,
    >
    > NULL -> no owner
    > (struct file *)1UL) -> kernel
    > real pointer -> user
    >
    > Which could simplify a lot of the code dealing with the owner.
    >

    Yeah! Sounds reasonable. I will make this in the next version.

    Best regards,
    baolu

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