[PATCH] arm64: errata: Workaround for SI L1 downstream coherency issue

[kernel test robot]

Hi Lucas,

kernel test robot noticed the following build warnings:

[auto build test WARNING on arm64/for-next/core]
[also build test WARNING on arm-perf/for-next/perf arm/for-next arm/fixes kvmarm/next soc/for-next linus/master v6.19-rc2 next-20251219]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Lucas-Wei/arm64-errata-Workaround-for-SI-L1-downstream-coherency-issue/20251226-154541
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
patch link:    https://lore.kernel.org/r/20251226074106.3751725-1-lucaswei%40google.com
patch subject: [PATCH] arm64: errata: Workaround for SI L1 downstream coherency issue
config: arm64-randconfig-r123-20251227 (https://download.01.org/0day-ci/archive/20251227/202512271720.e5kDPkoP-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251227/202512271720.e5kDPkoP-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512271720.e5kDPkoP-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> arch/arm64/kernel/cpu_errata.c:145:1: sparse: sparse: symbol 'arm_si_l1_workaround_4311569' was not declared. Should it be static?
   arch/arm64/kernel/cpu_errata.c:444:18: sparse: sparse: Initializer entry defined twice
   arch/arm64/kernel/cpu_errata.c:445:17: sparse:   also defined here
   arch/arm64/kernel/cpu_errata.c:450:18: sparse: sparse: Initializer entry defined twice
   arch/arm64/kernel/cpu_errata.c:451:17: sparse:   also defined here
   arch/arm64/kernel/cpu_errata.c:757:17: sparse: sparse: Initializer entry defined twice
   arch/arm64/kernel/cpu_errata.c:758:18: sparse:   also defined here

vim +/arm_si_l1_workaround_4311569 +145 arch/arm64/kernel/cpu_errata.c

   143	
   144	#ifdef CONFIG_ARM64_ERRATUM_4311569
 > 145	DEFINE_STATIC_KEY_FALSE(arm_si_l1_workaround_4311569);
   146	static int __init early_arm_si_l1_workaround_4311569_cfg(char *arg)
   147	{
   148		static_branch_enable(&arm_si_l1_workaround_4311569);
   149		pr_info("Enabling cache maintenance workaround for ARM SI-L1 erratum 4311569\n");
   150	
   151		return 0;
   152	}
   153	early_param("arm_si_l1_workaround_4311569", early_arm_si_l1_workaround_4311569_cfg);
   154	

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