From dd8fe077022138d1f6aca7e6d6cceec61f56ce95 Mon Sep 17 00:00:00 2001 From: Jeremy Kerr Date: Mon, 21 Oct 2013 11:03:17 +0800 Subject: lib: consolidate util macros in util/util.h This change groups the offsetof, container_of and ARRAY_SIZE macros in a single header file util/util.h. Signed-off-by: Jeremy Kerr --- lib/util/util.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 lib/util/util.h (limited to 'lib/util') diff --git a/lib/util/util.h b/lib/util/util.h new file mode 100644 index 0000000..30b472d --- /dev/null +++ b/lib/util/util.h @@ -0,0 +1,34 @@ +/* + * Copyright (C) 2013 IBM Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * 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, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef UTIL_H +#define UTIL_H + +#ifndef container_of +#define container_of(_ptr, _type, _member) ({ \ + const typeof( ((_type *)0)->_member ) *__mptr = (_ptr); \ + (_type *)( (char *)__mptr - offsetof(_type,_member) );}) +#endif + +#ifndef offsetof +#define offsetof(_type, _member) ((size_t) &((_type *)0)->_member) +#endif + +#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0])) + +#endif /* UTIL_H */ + -- cgit v1.2.1