Re: [PATCH 3/5] mm: Rework return value for copy_one_pte()

[Oleg Nesterov]

On 09/21, Peter Xu wrote:
>
> @@ -866,13 +877,18 @@ static int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
>  	pte_unmap_unlock(orig_dst_pte, dst_ptl);
>  	cond_resched();
>  
> -	if (entry.val) {
> -		if (add_swap_count_continuation(entry, GFP_KERNEL) < 0)
> +	switch (copy_ret) {
> +	case COPY_MM_SWAP_CONT:
> +		if (add_swap_count_continuation(data.entry, GFP_KERNEL) < 0)
>  			return -ENOMEM;
> -		progress = 0;
> +		break;

Note that you didn't clear copy_ret, it is still COPY_MM_SWAP_CONT,

> +	default:
> +		break;
>  	}
> +
>  	if (addr != end)
>  		goto again;

After that the main loop can stop again because of need_resched(), and
in this case add_swap_count_continuation(data.entry) will be called again?

Oleg.