iommufd_ioctls: Use *mut cast for IOMMU_IOAS_UNMAP #2
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The kernel updates the length field to return the unmapped size, so the struct should be passed as a mutable pointer to the ioctl. Signed-off-by: Bo Chen <bchen@crusoe.ai>
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The kernel updates the length field to return the unmapped size, so the struct should be passed as a mutable pointer to the ioctl.