linux-kernel - Re: [PATCH] mm: percpu: Introduce normalized CPU-to-NUMA node mapping to reduce max

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Message-ID: <202507230509.juShbryQ-lkp@intel.com>
Date: Wed, 23 Jul 2025 05:40:04 +0800
From: kernel test robot <lkp@...el.com>
To: Jia He <justin.he@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	linux-kernel@...r.kernel.org, Jia He <justin.he@....com>
Subject: Re: [PATCH] mm: percpu: Introduce normalized CPU-to-NUMA node
 mapping to  reduce max_distance

Hi Jia,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/Jia-He/mm-percpu-Introduce-normalized-CPU-to-NUMA-node-mapping-to-reduce-max_distance/20250722-121559
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20250722041418.2024870-1-justin.he%40arm.com
patch subject: [PATCH] mm: percpu: Introduce normalized CPU-to-NUMA node mapping to  reduce max_distance
config: arm64-randconfig-001-20250722 (https://download.01.org/0day-ci/archive/20250723/202507230509.juShbryQ-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 853c343b45b3e83cc5eeef5a52fc8cc9d8a09252)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250723/202507230509.juShbryQ-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/202507230509.juShbryQ-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/base/arch_numa.c:154:12: warning: no previous prototype for function 'early_cpu_to_norm_node' [-Wmissing-prototypes]
     154 | int __init early_cpu_to_norm_node(int cpu)
         |            ^
   drivers/base/arch_numa.c:154:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     154 | int __init early_cpu_to_norm_node(int cpu)
         | ^
         | static 
   1 warning generated.


vim +/early_cpu_to_norm_node +154 drivers/base/arch_numa.c

   153	
 > 154	int __init early_cpu_to_norm_node(int cpu)
   155	{
   156		return cpu_to_norm_node_map[cpu];
   157	}
   158	

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