| Date | Mon, 15 Nov 2021 05:14:12 -0800 | From | Christoph Hellwig <> | Subject | Re: [PATCH 01/11] iommu: Add device dma ownership set/release interfaces |
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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.
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