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

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Message-ID: <202601171524.PAxAbxhr-lkp@intel.com>
Date: Sat, 17 Jan 2026 16:00:50 +0800
From: kernel test robot <lkp@...el.com>
To: Brian Gerst <brgerst@...il.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
 Ingo Molnar <mingo@...nel.org>
Subject: arch/x86/kernel/cpu/common.c:2083:1: sparse: sparse: symbol
 '__pcpu_scope___x86_call_depth' was not declared. Should it be static?

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:   d3eeb99bbc99cc5eb94a4a75ed4415a0272254ef
commit: 839be1619fb897364b782997bc2c5d072d7a79f2 x86/retbleed: Move call depth to percpu hot section
date:   11 months ago
config: x86_64-randconfig-121-20260117 (https://download.01.org/0day-ci/archive/20260117/202601171524.PAxAbxhr-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260117/202601171524.PAxAbxhr-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601171524.PAxAbxhr-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	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki