linux-kernel - Re: [PATCH] sched/fair: make CFS bandwidth slice per cpu group

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Message-ID: <201805010845.9XNBHCrE%fengguang.wu@intel.com>
Date:   Tue, 1 May 2018 08:31:09 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Cong Wang <xiyou.wangcong@...il.com>,
        Paul Turner <pjt@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Mike Galbraith <efault@....de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH] sched/fair: make CFS bandwidth slice per cpu group

Hi Cong,

I love your patch! Yet something to improve:

[auto build test ERROR on tip/sched/core]
[also build test ERROR on v4.17-rc3 next-20180430]
[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/Cong-Wang/sched-fair-make-CFS-bandwidth-slice-per-cpu-group/20180501-064013
config: i386-randconfig-a0-201817 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   In file included from kernel/sched/idle.c:8:0:
   kernel/sched/sched.h: In function 'sched_default_cfs_bandwidth_slice':
>> kernel/sched/sched.h:438:14: error: 'sysctl_sched_cfs_bandwidth_slice' undeclared (first use in this function)
     return (u64)sysctl_sched_cfs_bandwidth_slice * NSEC_PER_USEC;
                 ^
   kernel/sched/sched.h:438:14: note: each undeclared identifier is reported only once for each function it appears in

vim +/sysctl_sched_cfs_bandwidth_slice +438 kernel/sched/sched.h

   435	
   436	static inline u64 sched_default_cfs_bandwidth_slice(void)
   437	{
 > 438		return (u64)sysctl_sched_cfs_bandwidth_slice * NSEC_PER_USEC;
   439	}
   440	

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0-DAY kernel test infrastructure                Open Source Technology Center
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