Index: sys/compat/linuxkpi/common/include/linux/hash.h
===================================================================
--- /dev/null
+++ sys/compat/linuxkpi/common/include/linux/hash.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2013 François Tigeot
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice unmodified, this list of conditions, and the following
+ *    disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _LINUX_HASH_H_
+#define _LINUX_HASH_H_
+
+#include <asm/types.h>
+#include <sys/hash.h>
+#include <linux/bitops.h>
+
+static inline u64 hash_64(u64 val, unsigned int bits)
+{
+	u64 ret;
+
+	ret = (uint64_t)hash32_buf(&val, sizeof(val), bits);
+
+	return ret >> (64 - bits);
+}
+
+static inline u32 hash_32(u32 val, unsigned int bits)
+{
+	u32 ret;
+
+	ret = hash32_buf(&val, sizeof(val), bits);
+
+	return ret >> (32 - bits);
+}
+
+#if BITS_PER_LONG == 64	/* amd64 */
+#define hash_long(val, bits) hash_64(val, bits)
+#else	/* i386 */
+#define hash_long(val, bits) hash_32(val, bits)
+#endif
+
+#endif	/* _LINUX_HASH_H_ */