> +static int hmm_pfns_fill(unsigned long addr,
> + unsigned long end,
> + struct hmm_range *range,
> + enum hmm_pfn_value_e value)
Nit: can we use the space a little more efficient, e.g.:
static int hmm_pfns_fill(unsigned long addr, unsigned long end,
struct hmm_range *range, enum hmm_pfn_value_e value)
> +static int hmm_vma_walk_test(unsigned long start,
> + unsigned long end,
> + struct mm_walk *walk)
Same here.
> + if (!(vma->vm_flags & VM_READ)) {
> + (void) hmm_pfns_fill(start, end, range, HMM_PFN_NONE);
There should be no need for the void cast here.
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