Re: [PATCH v4 2/3] sched/cputime: Fix prev steal time accouting during cpu hotplug

[kbuild test robot <lkp@intel.com>]

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Hi,

[auto build test ERROR on tip/sched/core]
[also build test ERROR on v4.7-rc2 next-20160607]
[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/Wanpeng-Li/KVM-fix-steal-clock-warp-during-guest-cpu-hotplug/20160607-163708
config: arm-allmodconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 5.3.1-8) 5.3.1 20160205
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
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

All errors (new ones prefixed by >>):

   In file included from kernel/sched/cputime.c:7:0:
   kernel/sched/sched.h: In function 'account_reset_rq':
   kernel/sched/sched.h:1819:24: error: implicit declaration of function 'paravirt_steal_clock' [-Werror=implicit-function-declaration]
     rq->prev_steal_time = paravirt_steal_clock(cpu_of(rq));
                           ^
   In file included from kernel/sched/cputime.c:9:0:
   arch/arm/include/asm/paravirt.h: At top level:
>> arch/arm/include/asm/paravirt.h:14:19: error: conflicting types for 'paravirt_steal_clock'
    static inline u64 paravirt_steal_clock(int cpu)
                      ^
   In file included from kernel/sched/cputime.c:7:0:
   kernel/sched/sched.h:1819:24: note: previous implicit declaration of 'paravirt_steal_clock' was here
     rq->prev_steal_time = paravirt_steal_clock(cpu_of(rq));
                           ^
   cc1: some warnings being treated as errors

vim +/paravirt_steal_clock +14 arch/arm/include/asm/paravirt.h

02c2433b Stefano Stabellini 2015-11-23   8  
02c2433b Stefano Stabellini 2015-11-23   9  struct pv_time_ops {
02c2433b Stefano Stabellini 2015-11-23  10  	unsigned long long (*steal_clock)(int cpu);
02c2433b Stefano Stabellini 2015-11-23  11  };
02c2433b Stefano Stabellini 2015-11-23  12  extern struct pv_time_ops pv_time_ops;
02c2433b Stefano Stabellini 2015-11-23  13  
02c2433b Stefano Stabellini 2015-11-23 @14  static inline u64 paravirt_steal_clock(int cpu)
02c2433b Stefano Stabellini 2015-11-23  15  {
02c2433b Stefano Stabellini 2015-11-23  16  	return pv_time_ops.steal_clock(cpu);
02c2433b Stefano Stabellini 2015-11-23  17  }

:::::: The code at line 14 was first introduced by commit
:::::: 02c2433b3aa6b57313c261c9811bbbe49528101c arm: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops

:::::: TO: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
:::::: CC: David Vrabel <david.vrabel@citrix.com>

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0-DAY kernel test infrastructure                Open Source Technology Center
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