Re: [PATCH 2/2] uacce: add uacce module

[Greg Kroah-Hartman]

On Wed, Aug 14, 2019 at 05:34:25PM +0800, Zhangfei Gao wrote:
> +int uacce_register(struct uacce *uacce)
> +{
> +     int ret;
> +
> +     if (!uacce->pdev) {
> +             pr_debug("uacce parent device not set\n");
> +             return -ENODEV;
> +     }
> +
> +     if (uacce->flags & UACCE_DEV_NOIOMMU) {
> +             add_taint(TAINT_CRAP, LOCKDEP_STILL_OK);
> +             dev_warn(uacce->pdev,
> +                      "Register to noiommu mode, which export kernel data to 
> user space and may vulnerable to attack");
> +     }

THat is odd, why even offer this feature then if it is a major issue?

thanks,

greg k-h