1 files changed, 115 insertions, 0 deletions

diff --git a/lib/test_memcat_p.c b/lib/test_memcat_p.c
new file mode 100644
index 000000000000..849c477d49d0
--- /dev/null
+++ b/lib/test_memcat_p.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Test cases for memcat_p() in lib/memcat_p.c
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+struct test_struct {
+        int             num;
+        unsigned int    magic;
+};
+
+#define MAGIC           0xf00ff00f
+/* Size of each of the NULL-terminated input arrays */
+#define INPUT_MAX       128
+/* Expected number of non-NULL elements in the output array */
+#define EXPECT          (INPUT_MAX * 2 - 2)
+
+static int __init test_memcat_p_init(void)
+{
+        struct test_struct **in0, **in1, **out, **p;
+        int err = -ENOMEM, i, r, total = 0;
+
+        in0 = kcalloc(INPUT_MAX, sizeof(*in0), GFP_KERNEL);
+        if (!in0)
+                return err;
+
+        in1 = kcalloc(INPUT_MAX, sizeof(*in1), GFP_KERNEL);
+        if (!in1)
+                goto err_free_in0;
+
+        for (i = 0, r = 1; i < INPUT_MAX - 1; i++) {
+                in0[i] = kmalloc(sizeof(**in0), GFP_KERNEL);
+                if (!in0[i])
+                        goto err_free_elements;
+
+                in1[i] = kmalloc(sizeof(**in1), GFP_KERNEL);
+                if (!in1[i]) {
+                        kfree(in0[i]);
+                        goto err_free_elements;
+                }
+
+                /* lifted from test_sort.c */
+                r = (r * 725861) % 6599;
+                in0[i]->num = r;
+                in1[i]->num = -r;
+                in0[i]->magic = MAGIC;
+                in1[i]->magic = MAGIC;
+        }
+
+        in0[i] = in1[i] = NULL;
+
+        out = memcat_p(in0, in1);
+        if (!out)
+                goto err_free_all_elements;
+
+        err = -EINVAL;
+        for (i = 0, p = out; *p && (i < INPUT_MAX * 2 - 1); p++, i++) {
+                total += (*p)->num;
+
+                if ((*p)->magic != MAGIC) {
+                        pr_err("test failed: wrong magic at %d: %u\n", i,
+                               (*p)->magic);
+                        goto err_free_out;
+                }
+        }
+
+        if (total) {
+                pr_err("test failed: expected zero total, got %d\n", total);
+                goto err_free_out;
+        }
+
+        if (i != EXPECT) {
+                pr_err("test failed: expected output size %d, got %d\n",
+                       EXPECT, i);
+                goto err_free_out;
+        }
+
+        for (i = 0; i < INPUT_MAX - 1; i++)
+                if (out[i] != in0[i] || out[i + INPUT_MAX - 1] != in1[i]) {
+                        pr_err("test failed: wrong element order at %d\n", i);
+                        goto err_free_out;
+                }
+
+        err = 0;
+        pr_info("test passed\n");
+
+err_free_out:
+        kfree(out);
+err_free_all_elements:
+        i = INPUT_MAX;
+err_free_elements:
+        for (i--; i >= 0; i--) {
+                kfree(in1[i]);
+                kfree(in0[i]);
+        }
+
+        kfree(in1);
+err_free_in0:
+        kfree(in0);
+
+        return err;
+}
+
+static void __exit test_memcat_p_exit(void)
+{
+}
+
+module_init(test_memcat_p_init);
+module_exit(test_memcat_p_exit);
+
+MODULE_LICENSE("GPL");