move libkcompat inside ust

[ust.git] / include / ust / kcompat / simple.h

diff --git a/include/ust/kcompat/simple.h b/include/ust/kcompat/simple.h
new file mode 100644 (file)
index 0000000..762d802
--- /dev/null
+++ b/include/ust/kcompat/simple.h
@@ -0,0 +1,43 @@
+/*
+ * simple.h
+ *
+ * Copyright (C) 2009 - Pierre-Marc Fournier (pierre-marc dot fournier at polymtl dot ca)
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#ifndef KCOMPAT_SIMPLE_H
+#define KCOMPAT_SIMPLE_H
+
+/**
+ * container_of - cast a member of a structure out to the containing structure
+ * @ptr:       the pointer to the member.
+ * @type:      the type of the container struct this is embedded in.
+ * @member:    the name of the member within the struct.
+ *
+ */
+#define container_of(ptr, type, member) ({                     \
+       const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
+       (type *)( (char *)__mptr - offsetof(type,member) );})
+
+
+/* libkcompat: from rcupdate.h */
+
+struct rcu_head {
+       struct rcu_head *next;
+       void (*func)(struct rcu_head *head);
+};
+
+#endif /* KCOMPAT_SIMPLE_H */