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Date: Fri, 13 Jul 2018 21:00:44 +0800
From: kbuild test robot <lkp@...el.com>
To: Florian Westphal <fw@...len.de>
Cc: kbuild-all@...org, netfilter-devel@...r.kernel.org,
netdev@...r.kernel.org, arnd@...db.de,
Florian Westphal <fw@...len.de>
Subject: Re: [PATCH nf-next 1/2] ipv6: remove dependency of nf_defrag_ipv6 on
ipv6 module
Hi Florian,
I love your patch! Yet something to improve:
[auto build test ERROR on nf-next/master]
url: https://github.com/0day-ci/linux/commits/Florian-Westphal/ipv6-remove-dependency-of-nf_defrag_ipv6-on-ipv6-module/20180713-064909
base: https://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next.git master
config: x86_64-fedora-25 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
All error/warnings (new ones prefixed by >>):
In file included from include/linux/kernel.h:10:0,
from include/linux/list.h:9,
from include/linux/random.h:10,
from include/linux/net.h:22,
from net/ieee802154/6lowpan/reassembly.c:17:
net/ieee802154/6lowpan/reassembly.c: In function 'lowpan_frag_expire':
>> include/linux/kernel.h:964:51: error: dereferencing pointer to incomplete type 'struct frag_queue'
BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
^
include/linux/compiler.h:316:19: note: in definition of macro '__compiletime_assert'
bool __cond = !(condition); \
^~~~~~~~~
include/linux/compiler.h:339:2: note: in expansion of macro '_compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
^~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:45:37: note: in expansion of macro 'compiletime_assert'
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
^~~~~~~~~~~~~~~~~~
include/linux/kernel.h:964:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
^~~~~~~~~~~~~~~~
include/linux/kernel.h:964:20: note: in expansion of macro '__same_type'
BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
^~~~~~~~~~~
>> net/ieee802154/6lowpan/reassembly.c:57:7: note: in expansion of macro 'container_of'
fq = container_of(frag, struct frag_queue, q);
^~~~~~~~~~~~
In file included from include/linux/compiler_types.h:58:0,
from <command-line>:0:
>> include/linux/compiler-gcc.h:170:2: error: invalid use of undefined type 'struct frag_queue'
__builtin_offsetof(a, b)
^
include/linux/stddef.h:17:32: note: in expansion of macro '__compiler_offsetof'
#define offsetof(TYPE, MEMBER) __compiler_offsetof(TYPE, MEMBER)
^~~~~~~~~~~~~~~~~~~
include/linux/kernel.h:967:21: note: in expansion of macro 'offsetof'
((type *)(__mptr - offsetof(type, member))); })
^~~~~~~~
>> net/ieee802154/6lowpan/reassembly.c:57:7: note: in expansion of macro 'container_of'
fq = container_of(frag, struct frag_queue, q);
^~~~~~~~~~~~
net/ieee802154/6lowpan/reassembly.c: In function 'lowpan_net_frag_init':
>> net/ieee802154/6lowpan/reassembly.c:611:30: error: invalid application of 'sizeof' to incomplete type 'struct frag_queue'
lowpan_frags.qsize = sizeof(struct frag_queue);
^~~~~~
--
In file included from include/linux/kernel.h:10:0,
from include/linux/list.h:9,
from include/linux/random.h:10,
from include/linux/net.h:22,
from net/ieee802154//6lowpan/reassembly.c:17:
net/ieee802154//6lowpan/reassembly.c: In function 'lowpan_frag_expire':
>> include/linux/kernel.h:964:51: error: dereferencing pointer to incomplete type 'struct frag_queue'
BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
^
include/linux/compiler.h:316:19: note: in definition of macro '__compiletime_assert'
bool __cond = !(condition); \
^~~~~~~~~
include/linux/compiler.h:339:2: note: in expansion of macro '_compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
^~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:45:37: note: in expansion of macro 'compiletime_assert'
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
^~~~~~~~~~~~~~~~~~
include/linux/kernel.h:964:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
^~~~~~~~~~~~~~~~
include/linux/kernel.h:964:20: note: in expansion of macro '__same_type'
BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
^~~~~~~~~~~
net/ieee802154//6lowpan/reassembly.c:57:7: note: in expansion of macro 'container_of'
fq = container_of(frag, struct frag_queue, q);
^~~~~~~~~~~~
In file included from include/linux/compiler_types.h:58:0,
from <command-line>:0:
>> include/linux/compiler-gcc.h:170:2: error: invalid use of undefined type 'struct frag_queue'
__builtin_offsetof(a, b)
^
include/linux/stddef.h:17:32: note: in expansion of macro '__compiler_offsetof'
#define offsetof(TYPE, MEMBER) __compiler_offsetof(TYPE, MEMBER)
^~~~~~~~~~~~~~~~~~~
include/linux/kernel.h:967:21: note: in expansion of macro 'offsetof'
((type *)(__mptr - offsetof(type, member))); })
^~~~~~~~
net/ieee802154//6lowpan/reassembly.c:57:7: note: in expansion of macro 'container_of'
fq = container_of(frag, struct frag_queue, q);
^~~~~~~~~~~~
net/ieee802154//6lowpan/reassembly.c: In function 'lowpan_net_frag_init':
net/ieee802154//6lowpan/reassembly.c:611:30: error: invalid application of 'sizeof' to incomplete type 'struct frag_queue'
lowpan_frags.qsize = sizeof(struct frag_queue);
^~~~~~
vim +964 include/linux/kernel.h
cf14f27f Alexei Starovoitov 2018-03-28 954
^1da177e Linus Torvalds 2005-04-16 955 /**
^1da177e Linus Torvalds 2005-04-16 956 * container_of - cast a member of a structure out to the containing structure
^1da177e Linus Torvalds 2005-04-16 957 * @ptr: the pointer to the member.
^1da177e Linus Torvalds 2005-04-16 958 * @type: the type of the container struct this is embedded in.
^1da177e Linus Torvalds 2005-04-16 959 * @member: the name of the member within the struct.
^1da177e Linus Torvalds 2005-04-16 960 *
^1da177e Linus Torvalds 2005-04-16 961 */
^1da177e Linus Torvalds 2005-04-16 962 #define container_of(ptr, type, member) ({ \
c7acec71 Ian Abbott 2017-07-12 963 void *__mptr = (void *)(ptr); \
c7acec71 Ian Abbott 2017-07-12 @964 BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
c7acec71 Ian Abbott 2017-07-12 965 !__same_type(*(ptr), void), \
c7acec71 Ian Abbott 2017-07-12 966 "pointer type mismatch in container_of()"); \
c7acec71 Ian Abbott 2017-07-12 967 ((type *)(__mptr - offsetof(type, member))); })
^1da177e Linus Torvalds 2005-04-16 968
:::::: The code at line 964 was first introduced by commit
:::::: c7acec713d14c6ce8a20154f9dfda258d6bcad3b kernel.h: handle pointers to arrays better in container_of()
:::::: TO: Ian Abbott <abbotti@....co.uk>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>
---
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