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lib/list_sort: test: check element addresses

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Improve 'lib_sort()' test and check that:
 o 'cmp()' is called only for elements which were present in the original list,
   i.e., the 'a' and 'b' parameters are valid
 o the resulted (sorted) list consists onlly of the original elements
 o intdoruce "poison" fields to make sure data around 'struc list_head' field
   are not corrupted.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Cc: Don Mullis <don.mullis@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Artem Bityutskiy 2010-10-26 14:23:08 -07:00 committed by Linus Torvalds
parent 014afa943d
commit 041b78f232
1 changed files with 71 additions and 12 deletions
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83
lib/list_sort.c
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@ -145,24 +145,66 @@ EXPORT_SYMBOL(list_sort);
#include <linux/random.h>
struct debug_el {
struct list_head list;
int value;
unsigned serial;
};
static int cmp(void *priv, struct list_head *a, struct list_head *b)
{
return container_of(a, struct debug_el, list)->value
- container_of(b, struct debug_el, list)->value;
}
/*
* The pattern of set bits in the list length determines which cases
* are hit in list_sort().
*/
#define TEST_LIST_LEN (512+128+2) /* not including head */
#define TEST_POISON1 0xDEADBEEF
#define TEST_POISON2 0xA324354C
struct debug_el {
unsigned int poison1;
struct list_head list;
unsigned int poison2;
int value;
unsigned serial;
};
/* Array, containing pointers to all elements in the test list */
static struct debug_el **elts __initdata;
static int __init check(struct debug_el *ela, struct debug_el *elb)
{
if (ela->serial >= TEST_LIST_LEN) {
printk(KERN_ERR "list_sort_test: error: incorrect serial %d\n",
ela->serial);
return -EINVAL;
}
if (elb->serial >= TEST_LIST_LEN) {
printk(KERN_ERR "list_sort_test: error: incorrect serial %d\n",
elb->serial);
return -EINVAL;
}
if (elts[ela->serial] != ela || elts[elb->serial] != elb) {
printk(KERN_ERR "list_sort_test: error: phantom element\n");
return -EINVAL;
}
if (ela->poison1 != TEST_POISON1 || ela->poison2 != TEST_POISON2) {
printk(KERN_ERR "list_sort_test: error: bad poison: %#x/%#x\n",
ela->poison1, ela->poison2);
return -EINVAL;
}
if (elb->poison1 != TEST_POISON1 || elb->poison2 != TEST_POISON2) {
printk(KERN_ERR "list_sort_test: error: bad poison: %#x/%#x\n",
elb->poison1, elb->poison2);
return -EINVAL;
}
return 0;
}
static int __init cmp(void *priv, struct list_head *a, struct list_head *b)
{
struct debug_el *ela, *elb;
ela = container_of(a, struct debug_el, list);
elb = container_of(b, struct debug_el, list);
check(ela, elb);
return ela->value - elb->value;
}
static int __init list_sort_test(void)
{
int i, count = 1, err = -EINVAL;
@ -172,6 +214,13 @@ static int __init list_sort_test(void)
printk(KERN_DEBUG "list_sort_test: start testing list_sort()\n");
elts = kmalloc(sizeof(void *) * TEST_LIST_LEN, GFP_KERNEL);
if (!elts) {
printk(KERN_ERR "list_sort_test: error: cannot allocate "
"memory\n");
goto exit;
}
for (i = 0; i < TEST_LIST_LEN; i++) {
el = kmalloc(sizeof(*el), GFP_KERNEL);
if (!el) {
@ -182,6 +231,9 @@ static int __init list_sort_test(void)
/* force some equivalencies */
el->value = random32() % (TEST_LIST_LEN/3);
el->serial = i;
el->poison1 = TEST_POISON1;
el->poison2 = TEST_POISON2;
elts[i] = el;
list_add_tail(&el->list, &head);
}
@ -211,6 +263,12 @@ static int __init list_sort_test(void)
"equivalent elements not preserved\n");
goto exit;
}
if (check(el, el1)) {
printk(KERN_ERR "list_sort_test: error: element check "
"failed\n");
goto exit;
}
count++;
}
@ -222,6 +280,7 @@ static int __init list_sort_test(void)
err = 0;
exit:
kfree(elts);
list_for_each_safe(cur, tmp, &head) {
list_del(cur);
kfree(container_of(cur, struct debug_el, list));