range.c

/*
 * Range add and subtract
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sort.h>

#include <linux/range.h>

int add_range(struct range *range, int az, int nr_range, u64 start, u64 end)
{
	if (start >= end)
		return nr_range;

	/* Out of slots: */
	if (nr_range >= az)
		return nr_range;

	range[nr_range].start = start;
	range[nr_range].end = end;

	nr_range++;

	return nr_range;
}

int add_range_with_merge(struct range *range, int az, int nr_range,
		     u64 start, u64 end)
{
	int i;

	if (start >= end)
		return nr_range;

	/* Try to merge it with old one: */
	for (i = 0; i < nr_range; i++) {
		u64 final_start, final_end;
		u64 common_start, common_end;

		if (!range[i].end)
			continue;

		common_start = max(range[i].start, start);
		common_end = min(range[i].end, end);
		if (common_start > common_end)
			continue;

		final_start = min(range[i].start, start);
		final_end = max(range[i].end, end);

		range[i].start = final_start;
		range[i].end =  final_end;
		return nr_range;
	}

	/* Need to add it: */
	return add_range(range, az, nr_range, start, end);
}

void subtract_range(struct range *range, int az, u64 start, u64 end)
{
	int i, j;

	if (start >= end)
		return;

	for (j = 0; j < az; j++) {
		if (!range[j].end)
			continue;