[davidhildenbrand:nr_cpus 1/1] include/linux/threads.h:16:2: error: #error "CONFIG_NR_CPUS not defined"

[davidhildenbrand:nr_cpus 1/1] include/linux/threads.h:16:2: error: #error "CONFIG_NR_CPUS not defined"

[kernel test robot]

tree:   https://github.com/davidhildenbrand/linux nr_cpus
head:   06e0fc4651a486ac1ce333cccc89b394222431c8
commit: 06e0fc4651a486ac1ce333cccc89b394222431c8 [1/1] fixup
config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20240925/202409250306.YEdZ5YVi-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240925/202409250306.YEdZ5YVi-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/202409250306.YEdZ5YVi-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/um/os-Linux/skas/process.c:25:
>> include/linux/threads.h:16:2: error: #error "CONFIG_NR_CPUS not defined"
      16 | #error "CONFIG_NR_CPUS not defined"
         |  ^~~~~
>> arch/um/os-Linux/skas/process.c:256:19: error: 'CONFIG_NR_CPUS' undeclared here (not in a function)
     256 | int userspace_pid[NR_CPUS];
         |                   ^~~~~~~


vim +16 include/linux/threads.h

     4	
     5	
     6	/*
     7	 * The default limit for the nr of threads is now in
     8	 * /proc/sys/kernel/threads-max.
     9	 */
    10	
    11	/*
    12	 * Maximum supported processors.  Setting this smaller saves quite a
    13	 * bit of memory.  Use nr_cpu_ids instead of this except for static bitmaps.
    14	 */
    15	#ifndef CONFIG_NR_CPUS
  > 16	#error "CONFIG_NR_CPUS not defined"
    17	#endif
    18	

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