linux-kernel - Re: [PATCH v3 2/2] sched: Add a check for cpu unbound deferrable timers

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Date:   Tue, 5 May 2020 03:11:58 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Prasad Sodagudi <psodagud@...eaurora.org>, tglx@...utronix.de,
        john.stultz@...aro.org, sboyd@...nel.org, tj@...nel.org
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        saravanak@...gle.com, psodagud@...eaurora.org,
        pkondeti@...eaurora.org
Subject: Re: [PATCH v3 2/2] sched: Add a check for cpu unbound deferrable
 timers

Hi Prasad,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/timers/core]
[also build test ERROR on tip/auto-latest tip/timers/nohz v5.7-rc4 next-20200501]
[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/Prasad-Sodagudi/timer-make-deferrable-cpu-unbound-timers-really-not-bound-to-a-cpu/20200503-025049
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 4479730e9263befbb9ce9563a09563db2acb8f7c
config: riscv-nommu_virt_defconfig (attached as .config)
compiler: riscv64-linux-gcc (GCC) 9.3.0
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
        COMPILER_INSTALL_PATH=$HOME/0day GCC_VERSION=9.3.0 make.cross ARCH=riscv 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   kernel/time/timer.c: In function 'get_timer_cpu_base':
   kernel/time/timer.c:848:11: error: 'timer_base_deferrable' undeclared (first use in this function)
     848 |   base = &timer_base_deferrable;
         |           ^~~~~~~~~~~~~~~~~~~~~
   kernel/time/timer.c:848:11: note: each undeclared identifier is reported only once for each function it appears in
   kernel/time/timer.c: In function 'get_timer_this_cpu_base':
   kernel/time/timer.c:867:11: error: 'timer_base_deferrable' undeclared (first use in this function)
     867 |   base = &timer_base_deferrable;
         |           ^~~~~~~~~~~~~~~~~~~~~
   kernel/time/timer.c: In function 'run_timer_softirq':
>> kernel/time/timer.c:1829:24: error: 'deferrable_pending' undeclared (first use in this function)
    1829 |   if ((atomic_cmpxchg(&deferrable_pending, 1, 0) &&
         |                        ^~~~~~~~~~~~~~~~~~
   kernel/time/timer.c:1832:18: error: 'timer_base_deferrable' undeclared (first use in this function)
    1832 |    __run_timers(&timer_base_deferrable);
         |                  ^~~~~~~~~~~~~~~~~~~~~

vim +/deferrable_pending +1829 kernel/time/timer.c

  1817	
  1818	/*
  1819	 * This function runs timers and the timer-tq in bottom half context.
  1820	 */
  1821	static __latent_entropy void run_timer_softirq(struct softirq_action *h)
  1822	{
  1823		struct timer_base *base = this_cpu_ptr(&timer_bases[BASE_STD]);
  1824	
  1825		__run_timers(base);
  1826		if (IS_ENABLED(CONFIG_NO_HZ_COMMON)) {
  1827			__run_timers(this_cpu_ptr(&timer_bases[BASE_DEF]));
  1828	#ifdef CONFIG_SMP
> 1829			if ((atomic_cmpxchg(&deferrable_pending, 1, 0) &&
  1830					tick_do_timer_cpu == TICK_DO_TIMER_NONE) ||
  1831					tick_do_timer_cpu == smp_processor_id())
  1832				__run_timers(&timer_base_deferrable);
  1833	#endif
  1834		}
  1835	}
  1836	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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