linux-kernel - [rcu:rcu/alpha 1/19] arch/sparc/include/asm/ptrace.h:102:6: error: implicit declaration of function 'unlikely'

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Date:   Fri, 20 Oct 2017 05:17:54 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Will Deacon <will.deacon@....com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [rcu:rcu/alpha 1/19] arch/sparc/include/asm/ptrace.h:102:6: error:
 implicit declaration of function 'unlikely'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/alpha
head:   3b0c617a7b93610d4ab0894f3a6406e2c14a2d55
commit: c9fa4f5af10c9ae96f30764c4c9d0f9ca429a566 [1/19] linux/compiler.h: Split into compiler.h and compiler-types.h
config: sparc64-allyesconfig (attached as .config)
compiler: sparc64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout c9fa4f5af10c9ae96f30764c4c9d0f9ca429a566
        # save the attached .config to linux build tree
        make.cross ARCH=sparc64 

All errors (new ones prefixed by >>):

   In file included from arch/sparc/include/asm/processor_64.h:18:0,
                    from arch/sparc/include/asm/processor.h:4,
                    from include/linux/prefetch.h:14,
                    from drivers/net/ethernet/emulex/benet/be_main.c:18:
   arch/sparc/include/asm/ptrace.h: In function 'regs_get_register':
>> arch/sparc/include/asm/ptrace.h:102:6: error: implicit declaration of function 'unlikely' [-Werror=implicit-function-declaration]
     if (unlikely(offset >= MAX_REG_OFFSET))
         ^~~~~~~~
   cc1: some warnings being treated as errors

vim +/unlikely +102 arch/sparc/include/asm/ptrace.h

e8f4aa60 Allen Pais 2016-10-13   88  
e8f4aa60 Allen Pais 2016-10-13   89  /**
e8f4aa60 Allen Pais 2016-10-13   90   * regs_get_register() - get register value from its offset
e8f4aa60 Allen Pais 2016-10-13   91   * @regs:	pt_regs from which register value is gotten
e8f4aa60 Allen Pais 2016-10-13   92   * @offset:	offset number of the register.
e8f4aa60 Allen Pais 2016-10-13   93   *
e8f4aa60 Allen Pais 2016-10-13   94   * regs_get_register returns the value of a register whose
e8f4aa60 Allen Pais 2016-10-13   95   * offset from @regs. The @offset is the offset of the register
e8f4aa60 Allen Pais 2016-10-13   96   * in struct pt_regs. If @offset is bigger than MAX_REG_OFFSET,
e8f4aa60 Allen Pais 2016-10-13   97   * this returns 0.
e8f4aa60 Allen Pais 2016-10-13   98   */
e8f4aa60 Allen Pais 2016-10-13   99  static inline unsigned long regs_get_register(struct pt_regs *regs,
e8f4aa60 Allen Pais 2016-10-13  100  					     unsigned long offset)
e8f4aa60 Allen Pais 2016-10-13  101  {
e8f4aa60 Allen Pais 2016-10-13 @102  	if (unlikely(offset >= MAX_REG_OFFSET))
e8f4aa60 Allen Pais 2016-10-13  103  		return 0;
e8f4aa60 Allen Pais 2016-10-13  104  	if (offset == PT_V9_Y)
e8f4aa60 Allen Pais 2016-10-13  105  		return *(unsigned int *)((unsigned long)regs + offset);
e8f4aa60 Allen Pais 2016-10-13  106  	return *(unsigned long *)((unsigned long)regs + offset);
e8f4aa60 Allen Pais 2016-10-13  107  }
e8f4aa60 Allen Pais 2016-10-13  108  

:::::: The code at line 102 was first introduced by commit
:::::: e8f4aa6087fa80732382881ef7c0c96733bb1984 sparc64:Support User Probes for sparc

:::::: TO: Allen Pais <allen.pais@...cle.com>
:::::: CC: David S. Miller <davem@...emloft.net>

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