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kunit, slub: add test_kfree_rcu() and test_leak_destroy()

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Add a test that will create cache, allocate one object, kfree_rcu() it
and attempt to destroy it. As long as the usage of kvfree_rcu_barrier()
in kmem_cache_destroy() works correctly, there should be no warnings in
dmesg and the test should pass.

Additionally add a test_leak_destroy() test that leaks an object on
purpose and verifies that kmem_cache_destroy() catches it.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
Vlastimil Babka 2024-08-07 12:31:20 +02:00
parent 6c6c47b063
commit 4e1c44b3db
1 changed files with 31 additions and 0 deletions
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31
lib/slub_kunit.c
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@ -5,6 +5,7 @@
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/rcupdate.h>
#include "../mm/slab.h"
static struct kunit_resource resource;
@ -157,6 +158,34 @@ static void test_kmalloc_redzone_access(struct kunit *test)
kmem_cache_destroy(s);
}
struct test_kfree_rcu_struct {
struct rcu_head rcu;
};
static void test_kfree_rcu(struct kunit *test)
{
struct kmem_cache *s = test_kmem_cache_create("TestSlub_kfree_rcu",
sizeof(struct test_kfree_rcu_struct),
SLAB_NO_MERGE);
struct test_kfree_rcu_struct *p = kmem_cache_alloc(s, GFP_KERNEL);
kfree_rcu(p, rcu);
kmem_cache_destroy(s);
KUNIT_EXPECT_EQ(test, 0, slab_errors);
}
static void test_leak_destroy(struct kunit *test)
{
struct kmem_cache *s = test_kmem_cache_create("TestSlub_kfree_rcu",
64, SLAB_NO_MERGE);
kmem_cache_alloc(s, GFP_KERNEL);
kmem_cache_destroy(s);
KUNIT_EXPECT_EQ(test, 1, slab_errors);
}
static int test_init(struct kunit *test)
{
slab_errors = 0;
@ -177,6 +206,8 @@ static struct kunit_case test_cases[] = {
KUNIT_CASE(test_clobber_redzone_free),
KUNIT_CASE(test_kmalloc_redzone_access),
KUNIT_CASE(test_kfree_rcu),
KUNIT_CASE(test_leak_destroy),
{}
};