slub/kunit: skip test_kfree_rcu when the slub kunit test is built-in

Guenter Roeck reports that the new slub kunit tests added by commit
4e1c44b3 ("kunit, slub: add test_kfree_rcu() and
test_leak_destroy()") cause a lockup on boot on several architectures
when the kunit tests are configured to be built-in and not modules.

The test_kfree_rcu test invokes kfree_rcu() and boot sequence inspection
showed the runner for built-in kunit tests kunit_run_all_tests() is
called before setting system_state to SYSTEM_RUNNING and calling
rcu_end_inkernel_boot(), so this seems like a likely cause. So while I
was unable to reproduce the problem myself, skipping the test when the
slub_kunit module is built-in should avoid the issue.

An alternative fix that was moving the call to kunit_run_all_tests() a
bit later in the boot was tried, but has broken tests with functions
marked as __init due to free_initmem() already being done.

Fixes: 4e1c44b3 ("kunit, slub: add test_kfree_rcu() and test_leak_destroy()")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Closes: https://lore.kernel.org/all/6fcb1252-7990-4f0d-8027-5e83f0fb9409@roeck-us.net/
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Uladzislau Rezki <urezki@gmail.com>
Cc: rcu@vger.kernel.org
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: David Gow <davidgow@google.com>
Cc: Rae Moar <rmoar@google.com>
Cc: linux-kselftest@vger.kernel.org
Cc: kunit-dev@googlegroups.com
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>

lib/slub_kunit.c

@@ -164,10 +164,16 @@ struct test_kfree_rcu_struct {
 
 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);
+	struct kmem_cache *s;
+	struct test_kfree_rcu_struct *p;
+
+	if (IS_BUILTIN(CONFIG_SLUB_KUNIT_TEST))
+		kunit_skip(test, "can't do kfree_rcu() when test is built-in");
+
+	s = test_kmem_cache_create("TestSlub_kfree_rcu",
+				   sizeof(struct test_kfree_rcu_struct),
+				   SLAB_NO_MERGE);
+	p = kmem_cache_alloc(s, GFP_KERNEL);
 
 	kfree_rcu(p, rcu);
 	kmem_cache_destroy(s);