Re: [RFC] Distributed mmap API

[Andrew Morton]

Daniel Phillips <phillips@xxxxxxxx> wrote:
>
> -			pte = ptep_get_and_clear(ptep);
> +			if (unlikely(!all) && is_anon(pfn_to_page(pfn)))
> +				continue;
> +			pte = ptep_get_and_clear(ptep); /* get dirty bit atomically */
>  			tlb_remove_tlb_entry(tlb, ptep, address+offset);
>  			if (pfn_valid(pfn)) {

I think you need to check pfn_valid() before running is_anon(pfn_to_page())
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