linux-kernel - [tip:WIP.sched/core 59/63] arch/mips/oprofile/../../../drivers/oprofile/cpu_buffer.c:338:16: error: implicit declaration of function 'user

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Date:   Fri, 3 Feb 2017 07:09:25 +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 59/63]
 arch/mips/oprofile/../../../drivers/oprofile/cpu_buffer.c:338:16: error:
 implicit declaration of function 'user_mode'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.sched/core
head:   7f79b5e3727bae36481c9bc5587291d88742291f
commit: 153c06f705c75814624e6855e4a8d0ab29d4ba5b [59/63] sched/headers: Remove various unrelated headers from <linux/sched.h>
config: mips-fuloong2e_defconfig (attached as .config)
compiler: mips64el-linux-gnuabi64-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 153c06f705c75814624e6855e4a8d0ab29d4ba5b
        # save the attached .config to linux build tree
        make.cross ARCH=mips 

All errors (new ones prefixed by >>):

   arch/mips/oprofile/../../../drivers/oprofile/cpu_buffer.c: In function 'oprofile_add_sample':
>> arch/mips/oprofile/../../../drivers/oprofile/cpu_buffer.c:338:16: error: implicit declaration of function 'user_mode' [-Werror=implicit-function-declaration]
      is_kernel = !user_mode(regs);
                   ^~~~~~~~~
>> arch/mips/oprofile/../../../drivers/oprofile/cpu_buffer.c:339:8: error: implicit declaration of function 'profile_pc' [-Werror=implicit-function-declaration]
      pc = profile_pc(regs);
           ^~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/user_mode +338 arch/mips/oprofile/../../../drivers/oprofile/cpu_buffer.c

27357716 Brian Rogan  2006-03-28  332  void oprofile_add_sample(struct pt_regs * const regs, unsigned long event)
27357716 Brian Rogan  2006-03-28  333  {
9414e996 Phil Carmody 2010-04-28  334  	int is_kernel;
9414e996 Phil Carmody 2010-04-28  335  	unsigned long pc;
9414e996 Phil Carmody 2010-04-28  336  
9414e996 Phil Carmody 2010-04-28  337  	if (likely(regs)) {
9414e996 Phil Carmody 2010-04-28 @338  		is_kernel = !user_mode(regs);
9414e996 Phil Carmody 2010-04-28 @339  		pc = profile_pc(regs);
9414e996 Phil Carmody 2010-04-28  340  	} else {
9414e996 Phil Carmody 2010-04-28  341  		is_kernel = 0;    /* This value will not be used */
9414e996 Phil Carmody 2010-04-28  342  		pc = ESCAPE_CODE; /* as this causes an early return. */

:::::: The code at line 338 was first introduced by commit
:::::: 9414e99672271adcc661f3c160a30b374179b92f oprofile: protect from not being in an IRQ context

:::::: TO: Phil Carmody <ext-phil.2.carmody@...ia.com>
:::::: CC: Robert Richter <robert.richter@....com>

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