[openeuler:OLK-6.6 11017/11695] kernel/sched/isolation.c:134:53: error: 'setup_max_cpus' undeclared

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

tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   e0427893d95be3be1bb71e10dfb53b6f732e8e42
commit: 54bee36be952f18f6a9e8303822459e89daaa336 [11017/11695] sched/isolation: Fix boot crash when maxcpus < first housekeeping CPU
config: x86_64-buildonly-randconfig-004-20240801 (https://download.01.org/0day-ci/archive/20240801/202408010938.bIyKAerg-lkp@intel.com/config)
compiler: gcc-11 (Ubuntu 11.4.0-4ubuntu1) 11.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240801/202408010938.bIyKAerg-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/202408010938.bIyKAerg-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from kernel/sched/build_utility.c:105:
   kernel/sched/isolation.c: In function 'housekeeping_setup':
>> kernel/sched/isolation.c:134:53: error: 'setup_max_cpus' undeclared (first use in this function)
     134 |         if (first_cpu >= nr_cpu_ids || first_cpu >= setup_max_cpus) {
         |                                                     ^~~~~~~~~~~~~~
   kernel/sched/isolation.c:134:53: note: each undeclared identifier is reported only once for each function it appears in


vim +/setup_max_cpus +134 kernel/sched/isolation.c

   108	
   109	static int __init housekeeping_setup(char *str, unsigned long flags)
   110	{
   111		cpumask_var_t non_housekeeping_mask, housekeeping_staging;
   112		unsigned int first_cpu;
   113		int err = 0;
   114	
   115		if ((flags & HK_FLAG_TICK) && !(housekeeping.flags & HK_FLAG_TICK)) {
   116			if (!IS_ENABLED(CONFIG_NO_HZ_FULL)) {
   117				pr_warn("Housekeeping: nohz unsupported."
   118					" Build with CONFIG_NO_HZ_FULL\n");
   119				return 0;
   120			}
   121		}
   122	
   123		alloc_bootmem_cpumask_var(&non_housekeeping_mask);
   124		if (cpulist_parse(str, non_housekeeping_mask) < 0) {
   125			pr_warn("Housekeeping: nohz_full= or isolcpus= incorrect CPU range\n");
   126			goto free_non_housekeeping_mask;
   127		}
   128	
   129		alloc_bootmem_cpumask_var(&housekeeping_staging);
   130		cpumask_andnot(housekeeping_staging,
   131			       cpu_possible_mask, non_housekeeping_mask);
   132	
   133		first_cpu = cpumask_first_and(cpu_present_mask, housekeeping_staging);
 > 134		if (first_cpu >= nr_cpu_ids || first_cpu >= setup_max_cpus) {
   135			__cpumask_set_cpu(smp_processor_id(), housekeeping_staging);
   136			__cpumask_clear_cpu(smp_processor_id(), non_housekeeping_mask);
   137			if (!housekeeping.flags) {
   138				pr_warn("Housekeeping: must include one present CPU, "
   139					"using boot CPU:%d\n", smp_processor_id());
   140			}
   141		}
   142	
   143		if (cpumask_empty(non_housekeeping_mask))
   144			goto free_housekeeping_staging;
   145	
   146		if (!housekeeping.flags) {
   147			/* First setup call ("nohz_full=" or "isolcpus=") */
   148			enum hk_type type;
   149	
   150			for_each_set_bit(type, &flags, HK_TYPE_MAX)
   151				housekeeping_setup_type(type, housekeeping_staging);
   152		} else {
   153			/* Second setup call ("nohz_full=" after "isolcpus=" or the reverse) */
   154			enum hk_type type;
   155			unsigned long iter_flags = flags & housekeeping.flags;
   156	
   157			for_each_set_bit(type, &iter_flags, HK_TYPE_MAX) {
   158				if (!cpumask_equal(housekeeping_staging,
   159						   housekeeping.cpumasks[type])) {
   160					pr_warn("Housekeeping: nohz_full= must match isolcpus=\n");
   161					goto free_housekeeping_staging;
   162				}
   163			}
   164	
   165			iter_flags = flags & ~housekeeping.flags;
   166	
   167			for_each_set_bit(type, &iter_flags, HK_TYPE_MAX)
   168				housekeeping_setup_type(type, housekeeping_staging);
   169		}
   170	
   171		if ((flags & HK_FLAG_TICK) && !(housekeeping.flags & HK_FLAG_TICK))
   172			tick_nohz_full_setup(non_housekeeping_mask);
   173	
   174		housekeeping.flags |= flags;
   175		err = 1;
   176	
   177	free_housekeeping_staging:
   178		free_bootmem_cpumask_var(housekeeping_staging);
   179	free_non_housekeeping_mask:
   180		free_bootmem_cpumask_var(non_housekeeping_mask);
   181	
   182		return err;
   183	}
   184	

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