// SPDX-License-Identifier: GPL-2.0
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/*
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* Test cases for memcat_p() in lib/memcat_p.c
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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struct test_struct {
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int num;
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unsigned int magic;
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};
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#define MAGIC 0xf00ff00f
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/* Size of each of the NULL-terminated input arrays */
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#define INPUT_MAX 128
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/* Expected number of non-NULL elements in the output array */
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#define EXPECT (INPUT_MAX * 2 - 2)
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static int __init test_memcat_p_init(void)
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{
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struct test_struct **in0, **in1, **out, **p;
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int err = -ENOMEM, i, r, total = 0;
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in0 = kcalloc(INPUT_MAX, sizeof(*in0), GFP_KERNEL);
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if (!in0)
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return err;
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in1 = kcalloc(INPUT_MAX, sizeof(*in1), GFP_KERNEL);
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if (!in1)
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goto err_free_in0;
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for (i = 0, r = 1; i < INPUT_MAX - 1; i++) {
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in0[i] = kmalloc(sizeof(**in0), GFP_KERNEL);
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if (!in0[i])
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goto err_free_elements;
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in1[i] = kmalloc(sizeof(**in1), GFP_KERNEL);
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if (!in1[i]) {
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kfree(in0[i]);
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goto err_free_elements;
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}
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/* lifted from test_sort.c */
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r = (r * 725861) % 6599;
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in0[i]->num = r;
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in1[i]->num = -r;
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in0[i]->magic = MAGIC;
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in1[i]->magic = MAGIC;
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}
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in0[i] = in1[i] = NULL;
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out = memcat_p(in0, in1);
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if (!out)
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goto err_free_all_elements;
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err = -EINVAL;
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for (i = 0, p = out; *p && (i < INPUT_MAX * 2 - 1); p++, i++) {
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total += (*p)->num;
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if ((*p)->magic != MAGIC) {
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pr_err("test failed: wrong magic at %d: %u\n", i,
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(*p)->magic);
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goto err_free_out;
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}
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}
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if (total) {
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pr_err("test failed: expected zero total, got %d\n", total);
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goto err_free_out;
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}
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if (i != EXPECT) {
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pr_err("test failed: expected output size %d, got %d\n",
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EXPECT, i);
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goto err_free_out;
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}
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for (i = 0; i < INPUT_MAX - 1; i++)
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if (out[i] != in0[i] || out[i + INPUT_MAX - 1] != in1[i]) {
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pr_err("test failed: wrong element order at %d\n", i);
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goto err_free_out;
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}
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err = 0;
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pr_info("test passed\n");
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err_free_out:
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kfree(out);
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err_free_all_elements:
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i = INPUT_MAX;
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err_free_elements:
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for (i--; i >= 0; i--) {
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kfree(in1[i]);
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kfree(in0[i]);
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}
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kfree(in1);
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err_free_in0:
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kfree(in0);
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return err;
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}
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static void __exit test_memcat_p_exit(void)
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{
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}
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module_init(test_memcat_p_init);
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module_exit(test_memcat_p_exit);
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MODULE_LICENSE("GPL");
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