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-rw-r--r--lib/test_rhashtable.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/lib/test_rhashtable.c b/lib/test_rhashtable.c
index 69f5b3849980..1eee90e6e394 100644
--- a/lib/test_rhashtable.c
+++ b/lib/test_rhashtable.c
@@ -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);