LXR linux/lib/test_memcat

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Test cases for memcat_p() in lib/memcat_p.c
   4 */
   5#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   6
   7#include <linux/string.h>
   8#include <linux/slab.h>
   9#include <linux/module.h>
  10
  11struct test_struct {
  12        int             num;
  13        unsigned int    magic;
  14};
  15
  16#define MAGIC           0xf00ff00f
  17/* Size of each of the NULL-terminated input arrays */
  18#define INPUT_MAX       128
  19/* Expected number of non-NULL elements in the output array */
  20#define EXPECT          (INPUT_MAX * 2 - 2)
  21
  22static int __init test_memcat_p_init(void)
  23{
  24        struct test_struct **in0, **in1, **out, **p;
  25        int err = -ENOMEM, i, r, total = 0;
  26
  27        in0 = kcalloc(INPUT_MAX, sizeof(*in0), GFP_KERNEL);
  28        if (!in0)
  29                return err;
  30
  31        in1 = kcalloc(INPUT_MAX, sizeof(*in1), GFP_KERNEL);
  32        if (!in1)
  33                goto err_free_in0;
  34
  35        for (i = 0, r = 1; i < INPUT_MAX - 1; i++) {
  36                in0[i] = kmalloc(sizeof(**in0), GFP_KERNEL);
  37                if (!in0[i])
  38                        goto err_free_elements;
  39
  40                in1[i] = kmalloc(sizeof(**in1), GFP_KERNEL);
  41                if (!in1[i]) {
  42                        kfree(in0[i]);
  43                        goto err_free_elements;
  44                }
  45
  46                /* lifted from test_sort.c */
  47                r = (r * 725861) % 6599;
  48                in0[i]->num = r;
  49                in1[i]->num = -r;
  50                in0[i]->magic = MAGIC;
  51                in1[i]->magic = MAGIC;
  52        }
  53
  54        in0[i] = in1[i] = NULL;
  55
  56        out = memcat_p(in0, in1);
  57        if (!out)
  58                goto err_free_all_elements;
  59
  60        err = -EINVAL;
  61        for (i = 0, p = out; *p && (i < INPUT_MAX * 2 - 1); p++, i++) {
  62                total += (*p)->num;
  63
  64                if ((*p)->magic != MAGIC) {
  65                        pr_err("test failed: wrong magic at %d: %u\n", i,
  66                               (*p)->magic);
  67                        goto err_free_out;
  68                }
  69        }
  70
  71        if (total) {
  72                pr_err("test failed: expected zero total, got %d\n", total);
  73                goto err_free_out;
  74        }
  75
  76        if (i != EXPECT) {
  77                pr_err("test failed: expected output size %d, got %d\n",
  78                       EXPECT, i);
  79                goto err_free_out;
  80        }
  81
  82        for (i = 0; i < INPUT_MAX - 1; i++)
  83                if (out[i] != in0[i] || out[i + INPUT_MAX - 1] != in1[i]) {
  84                        pr_err("test failed: wrong element order at %d\n", i);
  85                        goto err_free_out;
  86                }
  87
  88        err = 0;
  89        pr_info("test passed\n");
  90
  91err_free_out:
  92        kfree(out);
  93err_free_all_elements:
  94        i = INPUT_MAX;
  95err_free_elements:
  96        for (i--; i >= 0; i--) {
  97                kfree(in1[i]);
  98                kfree(in0[i]);
  99        }
 100
 101        kfree(in1);
 102err_free_in0:
 103        kfree(in0);
 104
 105        return err;
 106}
 107
 108static void __exit test_memcat_p_exit(void)
 109{
 110}
 111
 112module_init(test_memcat_p_init);
 113module_exit(test_memcat_p_exit);
 114
 115MODULE_LICENSE("GPL");
 116