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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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41
lib/sort.c
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@@ -4,6 +4,8 @@
* Jan 23 2005 Matt Mackall <mpm@selenic.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/types.h>
#include <linux/export.h>
#include <linux/sort.h>
@@ -101,42 +103,3 @@ void sort(void *base, size_t num, size_t size,
}
EXPORT_SYMBOL(sort);
#if 0
#include <linux/slab.h>
/* a simple boot-time regression test */
int cmpint(const void *a, const void *b)
{
return *(int *)a - *(int *)b;
}
static int sort_test(void)
{
int *a, i, r = 1;
a = kmalloc(1000 * sizeof(int), GFP_KERNEL);
BUG_ON(!a);
printk("testing sort()\n");
for (i = 0; i < 1000; i++) {
r = (r * 725861) % 6599;
a[i] = r;
}
sort(a, 1000, sizeof(int), cmpint, NULL);
for (i = 0; i < 999; i++)
if (a[i] > a[i+1]) {
printk("sort() failed!\n");
break;
}
kfree(a);
return 0;
}
module_init(sort_test);
#endif