Re: [PATCH 1/2] tick/nohz: Remove duplicate between tick_nohz_switch_to_nohz() and tick_setup_sched_timer()

[kernel test robot <lkp@intel.com>]

Hi Peng,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/timers/core]
[also build test ERROR on linus/master v6.7-rc3 next-20231127]
[cannot apply to tip/timers/nohz]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Peng-Liu/tick-nohz-Remove-duplicate-between-tick_nohz_lowres_handler-and-tick_nohz_highres_handler/20231127-163637
base:   tip/timers/core
patch link:    https://lore.kernel.org/r/TYCP286MB21464B3653B956AF71806931C6BDA%40TYCP286MB2146.JPNP286.PROD.OUTLOOK.COM
patch subject: [PATCH 1/2] tick/nohz: Remove duplicate between tick_nohz_switch_to_nohz() and tick_setup_sched_timer()
config: x86_64-randconfig-004-20231127 (https://download.01.org/0day-ci/archive/20231127/202311272337.qYKX6cSh-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231127/202311272337.qYKX6cSh-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311272337.qYKX6cSh-lkp@intel.com/

All errors (new ones prefixed by >>):

   kernel/time/tick-sched.c:1546:30: error: use of undeclared identifier 'tick_nohz_highres_handler'; did you mean 'tick_nohz_lowres_handler'?
                   ts->sched_timer.function = tick_nohz_highres_handler;
                                              ^~~~~~~~~~~~~~~~~~~~~~~~~
                                              tick_nohz_lowres_handler
   kernel/time/tick-sched.c:1395:13: note: 'tick_nohz_lowres_handler' declared here
   static void tick_nohz_lowres_handler(struct clock_event_device *dev)
               ^
>> kernel/time/tick-sched.c:1552:6: error: use of undeclared identifier 'sched_skew_tick'; did you mean 'scheduler_tick'?
           if (sched_skew_tick) {
               ^~~~~~~~~~~~~~~
               scheduler_tick
   include/linux/sched.h:294:13: note: 'scheduler_tick' declared here
   extern void scheduler_tick(void);
               ^
   2 errors generated.


vim +1552 kernel/time/tick-sched.c

62cf20b32aee4a Thomas Gleixner           2012-05-25  1533  
de667c3b095eed Peng Liu                  2023-11-27  1534  #if defined CONFIG_NO_HZ_COMMON || defined CONFIG_HIGH_RES_TIMERS
79bf2bb335b85d Thomas Gleixner           2007-02-16  1535  /**
79bf2bb335b85d Thomas Gleixner           2007-02-16  1536   * tick_setup_sched_timer - setup the tick emulation timer
79bf2bb335b85d Thomas Gleixner           2007-02-16  1537   */
de667c3b095eed Peng Liu                  2023-11-27  1538  void tick_setup_sched_timer(int mode)
79bf2bb335b85d Thomas Gleixner           2007-02-16  1539  {
22127e93c587af Christoph Lameter         2014-08-17  1540  	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);
79bf2bb335b85d Thomas Gleixner           2007-02-16  1541  	ktime_t now = ktime_get();
79bf2bb335b85d Thomas Gleixner           2007-02-16  1542  
6c774377359923 Ingo Molnar               2023-09-28  1543  	/* Emulate tick processing via per-CPU hrtimers: */
902a9f9c509053 Sebastian Andrzej Siewior 2019-07-26  1544  	hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);
de667c3b095eed Peng Liu                  2023-11-27  1545  	if (mode == NOHZ_MODE_HIGHRES)
dba428a678c726 Frederic Weisbecker       2023-09-12  1546  		ts->sched_timer.function = tick_nohz_highres_handler;
79bf2bb335b85d Thomas Gleixner           2007-02-16  1547  
0de7611a1031f2 Ingo Molnar               2016-07-01  1548  	/* Get the next period (per-CPU) */
cc584b213f252b Arjan van de Ven          2008-09-01  1549  	hrtimer_set_expires(&ts->sched_timer, tick_init_jiffy_update());
79bf2bb335b85d Thomas Gleixner           2007-02-16  1550  
6c774377359923 Ingo Molnar               2023-09-28  1551  	/* Offset the tick to avert 'jiffies_lock' contention. */
5307c9556bc17e Mike Galbraith            2012-05-08 @1552  	if (sched_skew_tick) {
b9965449164299 Thomas Gleixner           2020-11-17  1553  		u64 offset = TICK_NSEC >> 1;
5307c9556bc17e Mike Galbraith            2012-05-08  1554  		do_div(offset, num_possible_cpus());
5307c9556bc17e Mike Galbraith            2012-05-08  1555  		offset *= smp_processor_id();
5307c9556bc17e Mike Galbraith            2012-05-08  1556  		hrtimer_add_expires_ns(&ts->sched_timer, offset);
5307c9556bc17e Mike Galbraith            2012-05-08  1557  	}
5307c9556bc17e Mike Galbraith            2012-05-08  1558  
b9965449164299 Thomas Gleixner           2020-11-17  1559  	hrtimer_forward(&ts->sched_timer, now, TICK_NSEC);
de667c3b095eed Peng Liu                  2023-11-27  1560  	if (mode == NOHZ_MODE_HIGHRES)
902a9f9c509053 Sebastian Andrzej Siewior 2019-07-26  1561  		hrtimer_start_expires(&ts->sched_timer, HRTIMER_MODE_ABS_PINNED_HARD);
de667c3b095eed Peng Liu                  2023-11-27  1562  	else
de667c3b095eed Peng Liu                  2023-11-27  1563  		tick_program_event(hrtimer_get_expires(&ts->sched_timer), 1);
de667c3b095eed Peng Liu                  2023-11-27  1564  	tick_nohz_activate(ts, mode);
79bf2bb335b85d Thomas Gleixner           2007-02-16  1565  }
3c4fbe5e01d7e5 Miao Xie                  2008-08-20  1566  #endif /* HIGH_RES_TIMERS */
79bf2bb335b85d Thomas Gleixner           2007-02-16  1567  

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