[PATCH v2 19/37] mm/gup: remove record_subpages()

[David Hildenbrand]

>    	pmdp = pmd_offset_lockless(pudp, pud, addr);
> @@ -3046,23 +3041,21 @@ static int gup_fast_pmd_range(pud_t *pudp, pud_t pud, unsigned long addr,
>    
>    		next = pmd_addr_end(addr, end);
>    		if (!pmd_present(pmd))
> -			return 0;
> +			break;
>    
> -		if (unlikely(pmd_leaf(pmd))) {
> -			/* See gup_fast_pte_range() */
> -			if (pmd_protnone(pmd))
> -				return 0;
> +		if (unlikely(pmd_leaf(pmd)))
> +			cur_nr_pages = gup_fast_pmd_leaf(pmd, pmdp, addr, next, flags, pages);
> +		else
> +			cur_nr_pages = gup_fast_pte_range(pmd, pmdp, addr, next, flags, pages);
>    
> -			if (!gup_fast_pmd_leaf(pmd, pmdp, addr, next, flags,
> -				pages, nr))
> -				return 0;
> +		nr_pages += cur_nr_pages;
> +		pages += cur_nr_pages;
>    
> -		} else if (!gup_fast_pte_range(pmd, pmdp, addr, next, flags,
> -					       pages, nr))
> -			return 0;
> +		if (nr_pages != (next - addr) >> PAGE_SIZE)
> +			break;

^ cur_nr_pages. Open for suggestions on how to make that thing here even 
better.

-- 
Cheers

David / dhildenb