[dwmw2:parallel-6.2-rc6-part1 6/9] kernel/smpboot.c:28:1: sparse: sparse: symbol '__pcpu_scope_idle_threads' was not declared. Should it be static?

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

tree:   git://git.infradead.org/users/dwmw2/linux parallel-6.2-rc6-part1
head:   ce7e2d1e046a163f4c44f091c8a7cc52c49c91ff
commit: 16cbbd7ba311802f092c246998b466512e16237b [6/9] x86/smpboot: Support parallel startup of secondary CPUs
config: x86_64-randconfig-s023-20230531 (https://download.01.org/0day-ci/archive/20230603/202306032233.CUgcsNvw-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        git remote add dwmw2 git://git.infradead.org/users/dwmw2/linux
        git fetch --no-tags dwmw2 parallel-6.2-rc6-part1
        git checkout 16cbbd7ba311802f092c246998b466512e16237b
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 olddefconfig
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306032233.CUgcsNvw-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> kernel/smpboot.c:28:1: sparse: sparse: symbol '__pcpu_scope_idle_threads' was not declared. Should it be static?

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