Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / batman-adv / hash.c

diff --git a/kernel/net/batman-adv/hash.c b/kernel/net/batman-adv/hash.c
new file mode 100644 (file)
index 0000000..7c1c630
--- /dev/null
+++ b/kernel/net/batman-adv/hash.c
@@ -0,0 +1,76 @@
+/* Copyright (C) 2006-2014 B.A.T.M.A.N. contributors:
+ *
+ * Simon Wunderlich, Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "main.h"
+#include "hash.h"
+
+/* clears the hash */
+static void batadv_hash_init(struct batadv_hashtable *hash)
+{
+       uint32_t i;
+
+       for (i = 0; i < hash->size; i++) {
+               INIT_HLIST_HEAD(&hash->table[i]);
+               spin_lock_init(&hash->list_locks[i]);
+       }
+}
+
+/* free only the hashtable and the hash itself. */
+void batadv_hash_destroy(struct batadv_hashtable *hash)
+{
+       kfree(hash->list_locks);
+       kfree(hash->table);
+       kfree(hash);
+}
+
+/* allocates and clears the hash */
+struct batadv_hashtable *batadv_hash_new(uint32_t size)
+{
+       struct batadv_hashtable *hash;
+
+       hash = kmalloc(sizeof(*hash), GFP_ATOMIC);
+       if (!hash)
+               return NULL;
+
+       hash->table = kmalloc_array(size, sizeof(*hash->table), GFP_ATOMIC);
+       if (!hash->table)
+               goto free_hash;
+
+       hash->list_locks = kmalloc_array(size, sizeof(*hash->list_locks),
+                                        GFP_ATOMIC);
+       if (!hash->list_locks)
+               goto free_table;
+
+       hash->size = size;
+       batadv_hash_init(hash);
+       return hash;
+
+free_table:
+       kfree(hash->table);
+free_hash:
+       kfree(hash);
+       return NULL;
+}
+
+void batadv_hash_set_lock_class(struct batadv_hashtable *hash,
+                               struct lock_class_key *key)
+{
+       uint32_t i;
+
+       for (i = 0; i < hash->size; i++)
+               lockdep_set_class(&hash->list_locks[i], key);
+}