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1 | /* |
2 | * simple.h | |
3 | * | |
4 | * Copyright (C) 2009 - Pierre-Marc Fournier (pierre-marc dot fournier at polymtl dot ca) | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | * | |
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #ifndef KCOMPAT_SIMPLE_H | |
22 | #define KCOMPAT_SIMPLE_H | |
23 | ||
24 | /** | |
25 | * container_of - cast a member of a structure out to the containing structure | |
26 | * @ptr: the pointer to the member. | |
27 | * @type: the type of the container struct this is embedded in. | |
28 | * @member: the name of the member within the struct. | |
29 | * | |
30 | */ | |
31 | #define container_of(ptr, type, member) ({ \ | |
32 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ | |
33 | (type *)( (char *)__mptr - offsetof(type,member) );}) | |
34 | ||
35 | ||
36 | /* libkcompat: from rcupdate.h */ | |
37 | ||
38 | struct rcu_head { | |
39 | struct rcu_head *next; | |
40 | void (*func)(struct rcu_head *head); | |
41 | }; | |
42 | ||
43 | #endif /* KCOMPAT_SIMPLE_H */ |