linux-kernel - [tip:WIP.x86/pti 12/26] include/linux/sched/topology.h:41:9: error: implicit declaration of function 'static_branch

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Message-ID: <201811220421.yt4LcKpp%fengguang.wu@intel.com>
Date:   Thu, 22 Nov 2018 04:07:22 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org, tipbuild@...or.com
Subject: [tip:WIP.x86/pti 12/26] include/linux/sched/topology.h:41:9: error:
 implicit declaration of function 'static_branch_likely'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/pti
head:   1dbc1eb4f898d3df3b663ce1d938693554877fd6
commit: fa8d301b556b3b60a680feae724597decb8e8632 [12/26] sched/smt: Expose sched_smt_present static key
config: ia64-allyesconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 8.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout fa8d301b556b3b60a680feae724597decb8e8632
        # save the attached .config to linux build tree
        GCC_VERSION=8.1.0 make.cross ARCH=ia64 

All errors (new ones prefixed by >>):

   In file included from include/linux/cpuset.h:13,
                    from kernel/cgroup/cpuset.c:27:
   include/linux/sched/topology.h: In function 'sched_smt_active':
>> include/linux/sched/topology.h:41:9: error: implicit declaration of function 'static_branch_likely' [-Werror=implicit-function-declaration]
     return static_branch_likely(&sched_smt_present);
            ^~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/static_branch_likely +41 include/linux/sched/topology.h

    38	
    39	static __always_inline bool sched_smt_active(void)
    40	{
  > 41		return static_branch_likely(&sched_smt_present);
    42	}
    43	

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