linux-kernel - [tip:WIP.sched/core 162/162] include/linux/topology.h:204:9: error: implicit declaration of function 'cpumask_of

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Date:   Mon, 6 Feb 2017 10:29:08 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org, tipbuild@...or.com
Subject: [tip:WIP.sched/core 162/162] include/linux/topology.h:204:9: error:
 implicit declaration of function 'cpumask_of_node'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.sched/core
head:   38c7fc1c938c469af27c032bf4eab0c4aaf4eba1
commit: 38c7fc1c938c469af27c032bf4eab0c4aaf4eba1 [162/162] sched/headers: Reduce header dependencies
config: arm64-allmodconfig (attached as .config)
compiler: aarch64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 38c7fc1c938c469af27c032bf4eab0c4aaf4eba1
        # save the attached .config to linux build tree
        make.cross ARCH=arm64 

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

   In file included from include/linux/sched.h:26:0,
                    from arch/arm64/kernel/asm-offsets.c:21:
   include/linux/topology.h: In function 'cpu_cpu_mask':
>> include/linux/topology.h:204:9: error: implicit declaration of function 'cpumask_of_node' [-Werror=implicit-function-declaration]
     return cpumask_of_node(cpu_to_node(cpu));
            ^~~~~~~~~~~~~~~
>> include/linux/topology.h:204:9: warning: return makes pointer from integer without a cast [-Wint-conversion]
     return cpumask_of_node(cpu_to_node(cpu));
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   In file included from arch/arm64/include/asm/mmzone.h:6:0,
                    from include/linux/mmzone.h:889,
                    from include/linux/gfp.h:5,
                    from include/linux/mm.h:9,
                    from arch/arm64/kernel/asm-offsets.c:22:
   arch/arm64/include/asm/numa.h: At top level:
>> arch/arm64/include/asm/numa.h:14:0: warning: "node_distance" redefined
    #define node_distance(a, b) __node_distance(a, b)
    
   In file included from include/linux/sched.h:26:0,
                    from arch/arm64/kernel/asm-offsets.c:21:
   include/linux/topology.h:49:0: note: this is the location of the previous definition
    #define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
    
   In file included from arch/arm64/include/asm/mmzone.h:6:0,
                    from include/linux/mmzone.h:889,
                    from include/linux/gfp.h:5,
                    from include/linux/mm.h:9,
                    from arch/arm64/kernel/asm-offsets.c:22:
>> arch/arm64/include/asm/numa.h:25:23: error: conflicting types for 'cpumask_of_node'
    const struct cpumask *cpumask_of_node(int node);
                          ^~~~~~~~~~~~~~~
   In file included from include/linux/sched.h:26:0,
                    from arch/arm64/kernel/asm-offsets.c:21:
   include/linux/topology.h:204:9: note: previous implicit declaration of 'cpumask_of_node' was here
     return cpumask_of_node(cpu_to_node(cpu));
            ^~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors
   make[2]: *** [arch/arm64/kernel/asm-offsets.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [sub-make] Error 2

vim +/cpumask_of_node +204 include/linux/topology.h

06931e62 Bartosz Golaszewski 2015-05-26  198  	return topology_sibling_cpumask(cpu);
143e1e28 Vincent Guittot     2014-04-11  199  }
143e1e28 Vincent Guittot     2014-04-11  200  #endif
143e1e28 Vincent Guittot     2014-04-11  201  
143e1e28 Vincent Guittot     2014-04-11  202  static inline const struct cpumask *cpu_cpu_mask(int cpu)
143e1e28 Vincent Guittot     2014-04-11  203  {
143e1e28 Vincent Guittot     2014-04-11 @204  	return cpumask_of_node(cpu_to_node(cpu));
143e1e28 Vincent Guittot     2014-04-11  205  }
143e1e28 Vincent Guittot     2014-04-11  206  
143e1e28 Vincent Guittot     2014-04-11  207  

:::::: The code at line 204 was first introduced by commit
:::::: 143e1e28cb40bed836b0a06567208bd7347c9672 sched: Rework sched_domain topology definition

:::::: TO: Vincent Guittot <vincent.guittot@...aro.org>
:::::: CC: Ingo Molnar <mingo@...nel.org>

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