test_rhashtable: add a check for max_size
add a test that tries to insert more than max_size elements.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/lib/test_rhashtable.c b/lib/test_rhashtable.c
index 69f5b38..1eee90e 100644
--- a/lib/test_rhashtable.c
+++ b/lib/test_rhashtable.c
@@ -246,6 +246,43 @@
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 @@
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);