lib/test_sort.c

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