linux-kernel - [PATCH 2/5] rhashtable: Check for count misatch in selftest

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Date:	Mon, 15 Sep 2014 14:18:01 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	davem@...emloft.net, eric.dumazet@...il.com,
	paulmck@...ux.vnet.ibm.com, john.r.fastabend@...el.com,
	kaber@...sh.net
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] rhashtable: Check for count misatch in selftest

Signed-off-by: Thomas Graf <tgraf@...g.ch>
---
 lib/rhashtable.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index c133d82..c10df45 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -648,15 +648,14 @@ static int __init test_rht_lookup(struct rhashtable *ht)
 	return 0;
 }
 
-static void test_bucket_stats(struct rhashtable *ht,
-				     struct bucket_table *tbl,
-				     bool quiet)
+static void test_bucket_stats(struct rhashtable *ht, struct bucket_table *tbl,
+			      bool quiet)
 {
-	unsigned int cnt, i, total = 0;
+	unsigned int cnt, rcu_cnt, i, total = 0;
 	struct test_obj *obj;
 
 	for (i = 0; i < tbl->size; i++) {
-		cnt = 0;
+		rcu_cnt = cnt = 0;
 
 		if (!quiet)
 			pr_info(" [%#4x/%zu]", i, tbl->size);
@@ -668,6 +667,13 @@ static void test_bucket_stats(struct rhashtable *ht,
 				pr_cont(" [%p],", obj);
 		}
 
+		rht_for_each_rcu(pos, tbl, i)
+			rcu_cnt++;
+
+		if (rcu_cnt != cnt)
+			pr_warn("Test failed: Chain count mismach %d != %d",
+				cnt, rcu_cnt);
+
 		if (!quiet)
 			pr_cont("\n  [%#x] first element: %p, chain length: %u\n",
 				i, tbl->buckets[i], cnt);
@@ -675,6 +681,9 @@ static void test_bucket_stats(struct rhashtable *ht,
 
 	pr_info("  Traversal complete: counted=%u, nelems=%zu, entries=%d\n",
 		total, ht->nelems, TEST_ENTRIES);
+
+	if (total != ht->nelems || total != TEST_ENTRIES)
+		pr_warn("Test failed: Total count mismatch ^^^");
 }
 
 static int __init test_rhashtable(struct rhashtable *ht)
-- 
1.9.3

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