Re: [RFC PATCH] vfio: type1: fix kthread use case

[Markus Elfring <Markus.Elfring@xxxxxx>]

…
> +++ b/drivers/vfio/vfio_iommu_type1.c
…
> @@ -2812,11 +2815,10 @@ static int vfio_iommu_type1_dma_rw_chunk
…
>  	if (!mm)
>  		return -EPERM;
>
> -	if (kthread)
> +	if (kthread && use_mm)

Can another design approach make sense here?

+	bool thread_use_mm = ((current->flags & PF_KTHREAD) && !current->mm);
+	if (thread_use_mm)


>  		kthread_use_mm(mm);
…

Regards,
Markus