arch/x86/kernel/cpu/common.c:2083:1: sparse: sparse: symbol '__pcpu_scope___x86_call_depth' was not declared. Should it be static?

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

Hi Brian,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   4a298a43f5e339f48d2dda0665c02b88ee9a4e03
commit: 839be1619fb897364b782997bc2c5d072d7a79f2 x86/retbleed: Move call depth to percpu hot section
date:   9 months ago
config: x86_64-randconfig-123-20251213 (https://download.01.org/0day-ci/archive/20251214/202512140644.bKd0WN29-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251214/202512140644.bKd0WN29-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/202512140644.bKd0WN29-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> arch/x86/kernel/cpu/common.c:2083:1: sparse: sparse: symbol '__pcpu_scope___x86_call_depth' was not declared. Should it be static?

vim +/__pcpu_scope___x86_call_depth +2083 arch/x86/kernel/cpu/common.c

  2076	
  2077	#ifdef CONFIG_X86_64
  2078	/*
  2079	 * Note: Do not make this dependant on CONFIG_MITIGATION_CALL_DEPTH_TRACKING
  2080	 * so that this space is reserved in the hot cache section even when the
  2081	 * mitigation is disabled.
  2082	 */
> 2083	DEFINE_PER_CPU_CACHE_HOT(u64, __x86_call_depth);
  2084	EXPORT_PER_CPU_SYMBOL(__x86_call_depth);
  2085	

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