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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/net/batman-adv/hash.h
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@@ -1,19 +1,7 @@
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 /* SPDX-License-Identifier: GPL-2.0 */
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-/* Copyright (C) 2006-2018  B.A.T.M.A.N. contributors:
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+/* Copyright (C) 2006-2020  B.A.T.M.A.N. contributors:
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  *
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  * Simon Wunderlich, Marek Lindner
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of version 2 of the GNU General Public
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- * License as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful, but
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- * WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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- * General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, see <http://www.gnu.org/licenses/>.
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  */
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 #ifndef _NET_BATMAN_ADV_HASH_H_
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@@ -21,14 +9,14 @@
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 #include "main.h"
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+#include <linux/atomic.h>
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 #include <linux/compiler.h>
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 #include <linux/list.h>
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+#include <linux/lockdep.h>
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 #include <linux/rculist.h>
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 #include <linux/spinlock.h>
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 #include <linux/stddef.h>
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 #include <linux/types.h>
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-
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-struct lock_class_key;
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 /* callback to a compare function.  should compare 2 element datas for their
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  * keys
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@@ -58,6 +46,9 @@
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 	/** @size: size of hashtable */
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 	u32 size;
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+
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+	/** @generation: current (generation) sequence number */
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+	atomic_t generation;
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 };
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 /* allocates and clears the hash */
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@@ -112,6 +103,7 @@
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 	/* no duplicate found in list, add new element */
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 	hlist_add_head_rcu(data_node, head);
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+	atomic_inc(&hash->generation);
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 	ret = 0;
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..
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@@ -154,6 +146,7 @@
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 		data_save = node;
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 		hlist_del_rcu(node);
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+		atomic_inc(&hash->generation);
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 		break;
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 	}
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 	spin_unlock_bh(&hash->list_locks[index]);