linux-kernel - Re: [PATCH] sched: Fix new task's load avg removed from source CPU in

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Date:	Wed, 16 Dec 2015 15:58:14 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Yuyang Du <yuyang.du@...el.com>
Cc:	kbuild-all@...org, Steve Muckle <steve.muckle@...aro.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Patrick Bellasi <patrick.bellasi@....com>,
	Juri Lelli <Juri.Lelli@....com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched: Fix new task's load avg removed from source CPU in

Hi Yuyang,

[auto build test WARNING on tip/sched/core]
[also build test WARNING on v4.4-rc5 next-20151216]

url:    https://github.com/0day-ci/linux/commits/Yuyang-Du/sched-Fix-new-task-s-load-avg-removed-from-source-CPU-in/20151216-154529
config: i386-randconfig-x000-12141102 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   kernel/sched/fair.c: In function 'remove_entity_load_avg':
>> kernel/sched/fair.c:2919:2: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
     u64 last_update_time_copy;
     ^

vim +2919 kernel/sched/fair.c

9ee474f5 Paul Turner 2012-10-04  2903  /*
9d89c257 Yuyang Du   2015-07-15  2904   * Task first catches up with cfs_rq, and then subtract
9d89c257 Yuyang Du   2015-07-15  2905   * itself from the cfs_rq (task must be off the queue now).
9ee474f5 Paul Turner 2012-10-04  2906   */
9d89c257 Yuyang Du   2015-07-15  2907  void remove_entity_load_avg(struct sched_entity *se)
2dac754e Paul Turner 2012-10-04  2908  {
9d89c257 Yuyang Du   2015-07-15  2909  	struct cfs_rq *cfs_rq = cfs_rq_of(se);
9d89c257 Yuyang Du   2015-07-15  2910  	u64 last_update_time;
9d89c257 Yuyang Du   2015-07-15  2911  
a13869ac Yuyang Du   2015-12-16  2912  	/*
a13869ac Yuyang Du   2015-12-16  2913  	 * Newly created task should not be removed from the source CPU before migration
a13869ac Yuyang Du   2015-12-16  2914  	 */
a13869ac Yuyang Du   2015-12-16  2915  	if (se->avg.last_update_time == 0)
a13869ac Yuyang Du   2015-12-16  2916  		return;
a13869ac Yuyang Du   2015-12-16  2917  
9d89c257 Yuyang Du   2015-07-15  2918  #ifndef CONFIG_64BIT
9d89c257 Yuyang Du   2015-07-15 @2919  	u64 last_update_time_copy;
9ee474f5 Paul Turner 2012-10-04  2920  
9d89c257 Yuyang Du   2015-07-15  2921  	do {
9d89c257 Yuyang Du   2015-07-15  2922  		last_update_time_copy = cfs_rq->load_last_update_time_copy;
9d89c257 Yuyang Du   2015-07-15  2923  		smp_rmb();
9d89c257 Yuyang Du   2015-07-15  2924  		last_update_time = cfs_rq->avg.last_update_time;
9d89c257 Yuyang Du   2015-07-15  2925  	} while (last_update_time != last_update_time_copy);
9d89c257 Yuyang Du   2015-07-15  2926  #else
9d89c257 Yuyang Du   2015-07-15  2927  	last_update_time = cfs_rq->avg.last_update_time;

:::::: The code at line 2919 was first introduced by commit
:::::: 9d89c257dfb9c51a532d69397f6eed75e5168c35 sched/fair: Rewrite runnable load and utilization average tracking

:::::: TO: Yuyang Du <yuyang.du@...el.com>
:::::: CC: Ingo Molnar <mingo@...nel.org>

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