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Thanks to Alejandro for providing help and his container_of implementation taken from sancus-core. https://github.com/sancus-project/sancus-core/blob/master/include/sancus_common.hstable/0.6
Christian Wiese
11 years ago
committed by
Christian Wiese
2 changed files with 63 additions and 3 deletions
@ -0,0 +1,60 @@
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# --- SDE-COPYRIGHT-NOTE-BEGIN ---
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# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
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#
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# Filename: package/.../util-linux/0001-replace-container_of.patch
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# Copyright (C) 2013 The OpenSDE Project
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#
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# More information can be found in the files COPYING and README.
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#
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# This patch file is dual-licensed. It is available under the license the
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# patched project is licensed under, as long as it is an OpenSource license
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# as defined at http://www.opensource.org/ (e.g. BSD, X11) or under the terms
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# of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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# --- SDE-COPYRIGHT-NOTE-END ---
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This patch is fixing build issues by using a more simple but reasonable
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container_of function without abusing __typeof__.
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Besides that it is removing code duplication because the list_entry function
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macro is the same as container_of.
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Without the patch we are getting following error:
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------------------------------------------------------------------------------
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sys-utils/prlimit.c: In function 'show_limits':
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sys-utils/prlimit.c:299:25: error: expected declaration specifiers or '...' before '(' token
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sys-utils/prlimit.c:299:25: error: '__mptr' undeclared (first use in this function)
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sys-utils/prlimit.c:299:25: note: each undeclared identifier is reported only once for each function it appears in
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sys-utils/prlimit.c: In function 'do_prlimit':
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sys-utils/prlimit.c:336:25: error: expected declaration specifiers or '...' before '(' token
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sys-utils/prlimit.c:336:25: error: '__mptr' undeclared (first use in this function
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------------------------------------------------------------------------------
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--- util-linux-2.23.2/include/c.h.orig 2013-08-27 10:32:00.890399403 +0200
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+++ util-linux-2.23.2/include/c.h 2013-08-27 10:41:56.872040920 +0200
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@@ -115,9 +115,8 @@
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#endif
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#ifndef container_of
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-#define container_of(ptr, type, member) ({ \
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- const __typeof__( ((type *)0)->member ) *__mptr = (ptr); \
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- (type *)( (char *)__mptr - offsetof(type,member) );})
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+#define container_of(ptr, type, member) \
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+ ((type *)((char *)(ptr) - offsetof(type, member)))
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#endif
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#ifndef HAVE_PROGRAM_INVOCATION_SHORT_NAME
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--- util-linux-2.23.2/include/list.h.orig 2013-08-27 10:35:19.025606381 +0200
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+++ util-linux-2.23.2/include/list.h 2013-08-27 10:36:09.172435338 +0200
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@@ -166,10 +166,7 @@
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* @type: the type of the struct this is embedded in.
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* @member: the name of the list_struct within the struct.
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*/
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-#define list_entry(ptr, type, member) ({ \
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- const typeof( ((type *)0)->member ) *__mptr = (ptr); \
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- (type *)( (char *)__mptr - offsetof(type,member) );})
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-
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+#define list_entry container_of
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#define list_first_entry(head, type, member) \
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((head) && (head)->next != (head) ? list_entry((head)->next, type, member) : NULL)
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