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lib: add CONFIG_TEST_SORT to enable self-test of sort()

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Along with the addition made to Kconfig.debug, the prior existing but
permanently disabled test function has been slightly refactored.

Patch has been tested using QEMU 2.1.2 with a .config obtained through
'make defconfig' (x86_64) and manually enabling the option.

[arnd@arndb.de: move sort self-test into a separate file]
  Link: http://lkml.kernel.org/r/20170112110657.3123790-1-arnd@arndb.de
Link: http://lkml.kernel.org/r/HE1PR09MB0394B0418D504DCD27167D4FD49B0@HE1PR09MB0394.eurprd09.prod.outlook.com
Signed-off-by: Kostenzer Felix <fkostenzer@live.at>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kostenzer Felix 2017-02-24 15:01:07 -08:00 • committed by Linus Torvalds
parent f231aebfc4
commit c5adae9583
4 changed files with 54 additions and 39 deletions
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43
lib/test_sort.c Normal file
View file

@ -0,0 +1,43 @@
#include <linux/sort.h>
#include <linux/slab.h>
#include <linux/module.h>
/* a simple boot-time regression test */
#define TEST_LEN 1000
static int __init cmpint(const void *a, const void *b)
{
return *(int *)a - *(int *)b;
}
static int __init test_sort_init(void)
{
int *a, i, r = 1, err = -ENOMEM;
a = kmalloc_array(TEST_LEN, sizeof(*a), GFP_KERNEL);
if (!a)
return err;
for (i = 0; i < TEST_LEN; i++) {
r = (r * 725861) % 6599;
a[i] = r;
}
sort(a, TEST_LEN, sizeof(*a), cmpint, NULL);
err = -EINVAL;
for (i = 0; i < TEST_LEN-1; i++)
if (a[i] > a[i+1]) {
pr_err("test has failed\n");
goto exit;
}
err = 0;
pr_info("test passed\n");
exit:
kfree(a);
return err;
}
module_init(test_sort_init);
MODULE_LICENSE("GPL");