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Date:   Sat, 20 Oct 2018 08:44:24 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     kbuild-all@...org, peterz@...radead.org, mingo@...nel.org,
        linux-kernel@...r.kernel.org, rjw@...ysocki.net,
        dietmar.eggemann@....com, Morten.Rasmussen@....com,
        patrick.bellasi@....com, pjt@...gle.com, bsegall@...gle.com,
        thara.gopinath@...aro.org,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [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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