LXR linux/lib/test

   1// SPDX-License-Identifier: GPL-2.0-only
   2#include <linux/sort.h>
   3#include <linux/slab.h>
   4#include <linux/module.h>
   5
   6/* a simple boot-time regression test */
   7
   8#define TEST_LEN 1000
   9
  10static int __init cmpint(const void *a, const void *b)
  11{
  12        return *(int *)a - *(int *)b;
  13}
  14
  15static int __init test_sort_init(void)
  16{
  17        int *a, i, r = 1, err = -ENOMEM;
  18
  19        a = kmalloc_array(TEST_LEN, sizeof(*a), GFP_KERNEL);
  20        if (!a)
  21                return err;
  22
  23        for (i = 0; i < TEST_LEN; i++) {
  24                r = (r * 725861) % 6599;
  25                a[i] = r;
  26        }
  27
  28        sort(a, TEST_LEN, sizeof(*a), cmpint, NULL);
  29
  30        err = -EINVAL;
  31        for (i = 0; i < TEST_LEN-1; i++)
  32                if (a[i] > a[i+1]) {
  33                        pr_err("test has failed\n");
  34                        goto exit;
  35                }
  36        err = 0;
  37        pr_info("test passed\n");
  38exit:
  39        kfree(a);
  40        return err;
  41}
  42
  43static void __exit test_sort_exit(void)
  44{
  45}
  46
  47module_init(test_sort_init);
  48module_exit(test_sort_exit);
  49
  50MODULE_LICENSE("GPL");
  51