>> Can it be helpful to convert initialisations for these variables
>> into later assignments?
>
> Perhaps. Then it looks like the below.


…
> +++ b/drivers/vfio/vfio_iommu_type1.c
> @@ -2798,9 +2798,12 @@ static int vfio_iommu_type1_dma_rw_chunk
…
> -     bool kthread = current->mm == NULL;
> +     bool kthread;
> +     bool use_mm;

I would prefer the following variable declarations then.

+       bool kthread, use_mm;


>       size_t offset;
>
> +     kthread = current->flags & PF_KTHREAD;
> +     use_mm = current->mm == NULL;

I propose to move such assignments directly before the corresponding check.


…
>       if (!mm)
>               return -EPERM;


+       kthread = current->flags & PF_KTHREAD;
+       use_mm = !current->mm;

> -     if (kthread)
> +     if (kthread && use_mm)
>               kthread_use_mm(mm);
…

Regards,
Markus
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