Commit a6359bd8 authored by Florian Westphal's avatar Florian Westphal Committed by David S. Miller
Browse files

test_rhashtable: add a check for max_size 



add a test that tries to insert more than max_size elements.

Signed-off-by: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f651616e

lib/test_rhashtable.c

+41 −0
Original line number Diff line number Diff line
@@ -246,6 +246,43 @@ static s64 __init test_rhashtable(struct rhashtable *ht, struct test_obj *array, 


static struct rhashtable ht;



static int __init test_rhashtable_max(struct test_obj *array,

				      unsigned int entries)

{

	unsigned int i, insert_retries = 0;

	int err;



	test_rht_params.max_size = roundup_pow_of_two(entries / 8);

	err = rhashtable_init(&ht, &test_rht_params);

	if (err)

		return err;



	for (i = 0; i < ht.max_elems; i++) {

		struct test_obj *obj = &array[i];



		obj->value.id = i * 2;

		err = insert_retry(&ht, obj, test_rht_params);

		if (err > 0)

			insert_retries += err;

		else if (err)

			return err;

	}



	err = insert_retry(&ht, &array[ht.max_elems], test_rht_params);

	if (err == -E2BIG) {

		err = 0;

	} else {

		pr_info("insert element %u should have failed with %d, got %d\n",

				ht.max_elems, -E2BIG, err);

		if (err == 0)

			err = -1;

	}



	rhashtable_destroy(&ht);



	return err;

}



static int thread_lookup_test(struct thread_data *tdata)

{

	unsigned int entries = tdata->entries;
@@ -386,7 +423,11 @@ static int __init test_rht_init(void) 
		total_time += time;

	}



	pr_info("test if its possible to exceed max_size %d: %s\n",

			test_rht_params.max_size, test_rhashtable_max(objs, entries) == 0 ?

			"no, ok" : "YES, failed");

	vfree(objs);



	do_div(total_time, runs);

	pr_info("Average test time: %llu\n", total_time);