[tip:x86/core 44/50] 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/tip/tip.git x86/core
head:   6d536cad0d55e71442b6d65500f74eb85544269e
commit: bacde25dbbad6180b434332ad829b9e2f8064a56 [44/50] x86/retbleed: Move call depth to percpu hot section
config: x86_64-randconfig-123-20250306 (https://download.01.org/0day-ci/archive/20250306/202503061407.cBrEr1Va-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/20250306/202503061407.cBrEr1Va-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/202503061407.cBrEr1Va-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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