linux-kernel - Re: [PATCH 2/2] mm: tlb: add tlb swap entries batch async release

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Message-ID: <202408010150.13yZScv6-lkp@intel.com>
Date: Thu, 1 Aug 2024 02:19:19 +0800
From: kernel test robot <lkp@...el.com>
To: Zhiguo Jiang <justinjiang@...o.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Will Deacon <will@...nel.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...nel.org>,
	Nick Piggin <npiggin@...nel.dk>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnd Bergmann <arnd@...db.de>, Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>, linux-arch@...r.kernel.org,
	cgroups@...r.kernel.org, Barry Song <21cnbao@...il.com>
Cc: oe-kbuild-all@...ts.linux.dev,
	Linux Memory Management List <linux-mm@...ck.org>,
	opensource.kernel@...o.com
Subject: Re: [PATCH 2/2] mm: tlb: add tlb swap entries batch async release

Hi Zhiguo,

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/Zhiguo-Jiang/mm-move-task_is_dying-to-h-headfile/20240730-215136
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20240730114426.511-3-justinjiang%40vivo.com
patch subject: [PATCH 2/2] mm: tlb: add tlb swap entries batch async release
config: i386-randconfig-061-20240731 (https://download.01.org/0day-ci/archive/20240801/202408010150.13yZScv6-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240801/202408010150.13yZScv6-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/202408010150.13yZScv6-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> mm/mmu_gather.c:54:10: sparse: sparse: symbol 'nr_exiting_processes' was not declared. Should it be static?
   mm/mmu_gather.c: note: in included file (through include/linux/mmzone.h, include/linux/gfp.h):
   include/linux/page-flags.h:235:46: sparse: sparse: self-comparison always evaluates to false
   include/linux/page-flags.h:235:46: sparse: sparse: self-comparison always evaluates to false

vim +/nr_exiting_processes +54 mm/mmu_gather.c

    53	
  > 54	atomic_t nr_exiting_processes = ATOMIC_INIT(0);
    55	static struct kmem_cache *swap_gather_cachep;
    56	static struct workqueue_struct *swapfree_wq;
    57	static DEFINE_STATIC_KEY_TRUE(tlb_swap_asyncfree_disabled);
    58	

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