[PATCH 1/3] makedumpfile: introduce struct cycle to store the cyclic region

[Baoquan He]

> +static void first_cycle(unsigned long long start, unsigned long long max, struct cycle *cycle)
> +{
> +	cycle->start_pfn = start;

recheck code, the start_pfn may need be aligned to info->pfn_cyclic,
Though I don't know what will happen if not doing this.
	cycle->start_pfn = round(start, info->pfn_cyclic);

> +	cycle->end_pfn = cycle->start_pfn + info->pfn_cyclic;
> +
> +	if (cycle->end_pfn > max)
> +		cycle->end_pfn = max;
> +}
> +