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![Paul Gortmaker](/assets/img/avatar_default.png)
This file isn't doing anything with modules and so it should not be including <linux/module.h> just to get basic stuff like printk() and min/max. Revector it to <linux/kernel.h>. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
159 lines
2.9 KiB
C
159 lines
2.9 KiB
C
/*
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* Range add and subtract
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/sort.h>
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#include <linux/range.h>
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int add_range(struct range *range, int az, int nr_range, u64 start, u64 end)
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{
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if (start >= end)
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return nr_range;
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/* Out of slots: */
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if (nr_range >= az)
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return nr_range;
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range[nr_range].start = start;
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range[nr_range].end = end;
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nr_range++;
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return nr_range;
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}
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int add_range_with_merge(struct range *range, int az, int nr_range,
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u64 start, u64 end)
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{
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int i;
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if (start >= end)
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return nr_range;
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/* Try to merge it with old one: */
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for (i = 0; i < nr_range; i++) {
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u64 final_start, final_end;
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u64 common_start, common_end;
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if (!range[i].end)
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continue;
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common_start = max(range[i].start, start);
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common_end = min(range[i].end, end);
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if (common_start > common_end)
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continue;
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final_start = min(range[i].start, start);
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final_end = max(range[i].end, end);
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range[i].start = final_start;
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range[i].end = final_end;
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return nr_range;
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}
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/* Need to add it: */
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return add_range(range, az, nr_range, start, end);
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}
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void subtract_range(struct range *range, int az, u64 start, u64 end)
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{
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int i, j;
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if (start >= end)
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return;
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for (j = 0; j < az; j++) {
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if (!range[j].end)
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continue;
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if (start <= range[j].start && end >= range[j].end) {
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range[j].start = 0;
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range[j].end = 0;
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continue;
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}
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if (start <= range[j].start && end < range[j].end &&
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range[j].start < end) {
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range[j].start = end;
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continue;
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}
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if (start > range[j].start && end >= range[j].end &&
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range[j].end > start) {
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range[j].end = start;
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continue;
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}
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if (start > range[j].start && end < range[j].end) {
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/* Find the new spare: */
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for (i = 0; i < az; i++) {
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if (range[i].end == 0)
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break;
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}
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if (i < az) {
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range[i].end = range[j].end;
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range[i].start = end;
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} else {
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printk(KERN_ERR "run of slot in ranges\n");
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}
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range[j].end = start;
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continue;
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}
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}
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}
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static int cmp_range(const void *x1, const void *x2)
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{
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const struct range *r1 = x1;
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const struct range *r2 = x2;
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s64 start1, start2;
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start1 = r1->start;
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start2 = r2->start;
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return start1 - start2;
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}
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int clean_sort_range(struct range *range, int az)
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{
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int i, j, k = az - 1, nr_range = az;
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for (i = 0; i < k; i++) {
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if (range[i].end)
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continue;
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for (j = k; j > i; j--) {
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if (range[j].end) {
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k = j;
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break;
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}
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}
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if (j == i)
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break;
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range[i].start = range[k].start;
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range[i].end = range[k].end;
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range[k].start = 0;
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range[k].end = 0;
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k--;
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}
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/* count it */
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for (i = 0; i < az; i++) {
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if (!range[i].end) {
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nr_range = i;
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break;
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}
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}
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/* sort them */
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sort(range, nr_range, sizeof(struct range), cmp_range, NULL);
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return nr_range;
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}
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void sort_range(struct range *range, int nr_range)
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{
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/* sort them */
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sort(range, nr_range, sizeof(struct range), cmp_range, NULL);
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}
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