Re: [PATCH v6 3/6] iommu: Add iommu_copy_struct_from_user_array helper

[Binbin Wu <binbin.wu@linux.intel.com>]

On 11/17/2023 9:07 PM, Yi Liu wrote:
> +
> +/**
> + * iommu_copy_struct_from_user_array - Copy iommu driver specific user space
> + *                                     data from an iommu_user_data_array
> + * @kdst: Pointer to an iommu driver specific user data that is defined in
> + *        include/uapi/linux/iommufd.h
> + * @user_array: Pointer to a struct iommu_user_data_array for a user space array
> + * @data_type: The data type of the @kdst. Must match with @user_array->type
> + * @index: Index to offset the location in the array to copy user data from
> + * @min_last: The last memember of the data structure @kdst points in the

s/memember/member/

> + *            initial version.
> + * Return 0 for success, otherwise -error.
> + */
> +#define iommu_copy_struct_from_user_array(kdst, user_array, data_type,   \
> +					  index, min_last)               \
> +	__iommu_copy_struct_from_user_array(kdst, user_array, data_type, \
> +					    index, sizeof(*kdst),        \
> +					    offsetofend(typeof(*kdst),   \
> +							min_last))
> +
>   /**
>    * struct iommu_ops - iommu ops and capabilities
>    * @capable: check capability