linux-kernel - Re: [PATCH 4/4] sched: add trace event for idle injection

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Message-ID: <201511140452.T2tT4I7n%fengguang.wu@intel.com>
Date:	Sat, 14 Nov 2015 04:10:02 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:	kbuild-all@...org, Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <john.stultz@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Len Brown <len.brown@...el.com>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>,
	Eduardo Valentin <edubezval@...il.com>,
	Paul Turner <pjt@...gle.com>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: Re: [PATCH 4/4] sched: add trace event for idle injection

Hi Jacob,

[auto build test ERROR on: tip/sched/core]
[also build test ERROR on: v4.3 next-20151113]

url:    https://github.com/0day-ci/linux/commits/Jacob-Pan/CFS-idle-injection/20151114-035732
config: cris-etrax-100lx_v2_defconfig (attached as .config)
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
        # save the attached .config to linux build tree
        make.cross ARCH=cris 

All errors (new ones prefixed by >>):

   kernel/sched/fair.c: In function 'pick_next_task_fair':
>> kernel/sched/fair.c:5316:4: error: implicit declaration of function 'trace_sched_cfs_idle_inject' [-Werror=implicit-function-declaration]
>> kernel/sched/fair.c:5316:32: error: 'CFS_IDLE_INJECT_YIELD_SOFTIRQ' undeclared (first use in this function)
   kernel/sched/fair.c:5316:32: note: each undeclared identifier is reported only once for each function it appears in
>> kernel/sched/fair.c:5319:31: error: 'CFS_IDLE_INJECT_FORCED' undeclared (first use in this function)
   cc1: some warnings being treated as errors

vim +/trace_sched_cfs_idle_inject +5316 kernel/sched/fair.c

  5310		return p;
  5311	
  5312	idle:
  5313		if (in_forced_idle(cfs_rq)) {
  5314			if (unlikely(local_softirq_pending())) {
  5315				__unthrottle_cfs_rq(cfs_rq);
> 5316				trace_sched_cfs_idle_inject(CFS_IDLE_INJECT_YIELD_SOFTIRQ, 1);
  5317				goto again;
  5318			}
> 5319			trace_sched_cfs_idle_inject(CFS_IDLE_INJECT_FORCED, 1);
  5320			return NULL;
  5321		}
  5322		/*

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