linux-kernel - Re: [PATCH] sched/loadavg: Avoid loadavg spikes caused by delayed NO

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Date:   Thu, 9 Feb 2017 00:04:02 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Matt Fleming <matt@...eblueprint.co.uk>
Cc:     kbuild-all@...org, Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Mike Galbraith <umgwanakikbuti@...il.com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        stable@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH] sched/loadavg: Avoid loadavg spikes caused by delayed
 NO_HZ accounting

Hi Matt,

[auto build test ERROR on tip/sched/core]
[also build test ERROR on v4.10-rc7 next-20170208]
[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/Matt-Fleming/sched-loadavg-Avoid-loadavg-spikes-caused-by-delayed-NO_HZ-accounting/20170208-224135
config: c6x-evmc6678_defconfig (attached as .config)
compiler: c6x-elf-gcc (GCC) 6.2.0
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=c6x 

All errors (new ones prefixed by >>):

   kernel/sched/loadavg.c: In function 'calc_load_exit_idle':
>> kernel/sched/loadavg.c:221:3: error: expected ')' before 'next_window'
      next_window += LOAD_FREQ;
      ^~~~~~~~~~~
>> kernel/sched/loadavg.c:224:1: error: expected expression before '}' token
    }
    ^

vim +221 kernel/sched/loadavg.c

   215		 * The next window is 'calc_load_update' if we haven't reached it yet,
   216		 * and 'calc_load_update + 10' if we're inside the current window.
   217		 */
   218		next_window = calc_load_update;
   219	
   220		if (time_in_range_open(jiffies, next_window, next_window + 10)
 > 221			next_window += LOAD_FREQ;
   222	
   223		this_rq->calc_load_update = next_window;
 > 224	}
   225	
   226	static long calc_load_fold_idle(void)
   227	{

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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