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SubjectRe: [PATCH 1/2] sched/fair: move rq_of helper function
Hi Vincent,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/sched/core]
[also build test ERROR on v4.19-rc8 next-20181019]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Vincent-Guittot/sched-fair-move-rq_of-helper-function/20181020-081004
config: i386-randconfig-x002-201841 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

All error/warnings (new ones prefixed by >>):

In file included from arch/x86/include/asm/current.h:5:0,
from include/linux/sched.h:12,
from kernel/sched/pelt.c:27:
kernel/sched/sched.h: In function 'rq_of':
>> include/linux/kernel.h:997:51: error: dereferencing pointer to incomplete type 'struct rq'
BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
^
include/linux/compiler.h:335:18: note: in definition of macro '__compiletime_assert'
int __cond = !(condition); \
^~~~~~~~~
include/linux/compiler.h:358:2: 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:997:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
^~~~~~~~~~~~~~~~
include/linux/kernel.h:997:20: note: in expansion of macro '__same_type'
BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
^~~~~~~~~~~
>> kernel/sched/sched.h:581:9: note: in expansion of macro 'container_of'
return container_of(cfs_rq, struct rq, cfs);
^~~~~~~~~~~~
In file included from <command-line>:0:0:
>> include/linux/compiler_types.h:237:35: error: invalid use of undefined type 'struct rq'
#define __compiler_offsetof(a, b) __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:1000:21: note: in expansion of macro 'offsetof'
((type *)(__mptr - offsetof(type, member))); })
^~~~~~~~
>> kernel/sched/sched.h:581:9: note: in expansion of macro 'container_of'
return container_of(cfs_rq, struct rq, cfs);
^~~~~~~~~~~~
--
In file included from arch/x86/include/asm/current.h:5:0,
from include/linux/sched.h:12,
from kernel/sched/sched.h:5,
from kernel/sched/fair.c:23:
kernel/sched/sched.h: In function 'rq_of':
>> include/linux/kernel.h:997:51: error: dereferencing pointer to incomplete type 'struct rq'
BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
^
include/linux/compiler.h:335:18: note: in definition of macro '__compiletime_assert'
int __cond = !(condition); \
^~~~~~~~~
include/linux/compiler.h:358:2: 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:997:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
^~~~~~~~~~~~~~~~
include/linux/kernel.h:997:20: note: in expansion of macro '__same_type'
BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
^~~~~~~~~~~
>> kernel/sched/sched.h:581:9: note: in expansion of macro 'container_of'
return container_of(cfs_rq, struct rq, cfs);
^~~~~~~~~~~~
In file included from <command-line>:0:0:
>> include/linux/compiler_types.h:237:35: error: invalid use of undefined type 'struct rq'
#define __compiler_offsetof(a, b) __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:1000:21: note: in expansion of macro 'offsetof'
((type *)(__mptr - offsetof(type, member))); })
^~~~~~~~
>> kernel/sched/sched.h:581:9: note: in expansion of macro 'container_of'
return container_of(cfs_rq, struct rq, cfs);
^~~~~~~~~~~~
In file included from kernel/sched/fair.c:23:0:
kernel/sched/sched.h:582:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^

vim +/container_of +581 kernel/sched/sched.h

578
579 static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
580 {
> 581 return container_of(cfs_rq, struct rq, cfs);
582 }
583 #endif
584

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