Subject: Re: [PATCH v1 1/1] sched/fair: do not preempt current task if it is going to call schedule()

From: kbuild test robot <[email-masked]>
Date: Thu, 5 Mar 2020 21:22:29 +0800

Hi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/sched/core]
[also build test ERROR on arm64/for-next/core tip/auto-latest linus/master v5.6-rc4 next-20200304]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/cl-rock-chips-com/wait_task_inactive-spend-too-much-time-on-system-startup/20200305-201639
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git a0f03b617c3b2644d3d47bf7d9e60aed01bd5b10
config: nds32-defconfig (attached as .config)
compiler: nds32le-linux-gcc (GCC) 9.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=9.2.0 make.cross ARCH=nds32 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <[email-masked]>

All errors (new ones prefixed by >>):

   In file included from arch/nds32/kernel/asm-offsets.c:4:
   include/linux/sched.h: In function 'set_tsk_going_to_sched':
>> include/linux/sched.h:1776:27: error: 'TIF_GOING_TO_SCHED' undeclared (first use in this function)
    1776 |  set_tsk_thread_flag(tsk, TIF_GOING_TO_SCHED);
         |                           ^~~~~~~~~~~~~~~~~~
   include/linux/sched.h:1776:27: note: each undeclared identifier is reported only once for each function it appears in
   include/linux/sched.h: In function 'clear_tsk_going_to_sched':
   include/linux/sched.h:1781:29: error: 'TIF_GOING_TO_SCHED' undeclared (first use in this function)
    1781 |  clear_tsk_thread_flag(tsk, TIF_GOING_TO_SCHED);
         |                             ^~~~~~~~~~~~~~~~~~
   In file included from include/linux/kernel.h:11,
                    from include/linux/list.h:9,
                    from include/linux/rculist.h:10,
                    from include/linux/pid.h:5,
                    from include/linux/sched.h:14,
                    from arch/nds32/kernel/asm-offsets.c:4:
   include/linux/sched.h: In function 'test_tsk_going_to_sched':
   include/linux/sched.h:1786:44: error: 'TIF_GOING_TO_SCHED' undeclared (first use in this function)
    1786 |  return unlikely(test_tsk_thread_flag(tsk, TIF_GOING_TO_SCHED));
         |                                            ^~~~~~~~~~~~~~~~~~
   include/linux/compiler.h:78:42: note: in definition of macro 'unlikely'
      78 | # define unlikely(x) __builtin_expect(!!(x), 0)
         |                                          ^
   make[2]: *** [scripts/Makefile.build:101: arch/nds32/kernel/asm-offsets.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [Makefile:1112: prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:179: sub-make] Error 2
   22 real  7 user  11 sys  85.87% cpu 	make prepare

vim +/TIF_GOING_TO_SCHED +1776 include/linux/sched.h

  1773	
  1774	static inline void set_tsk_going_to_sched(struct task_struct *tsk)
  1775	{
> 1776		set_tsk_thread_flag(tsk, TIF_GOING_TO_SCHED);
  1777	}
  1778	

---
0-DAY CI Kernel Test Service, Intel Corporation
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