Re: [PATCH v5 4/4] mm: Introduce per-thpsize swapin control policy

[kernel test robot <lkp@intel.com>]

Hi Barry,

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/Barry-Song/mm-swap-introduce-swapcache_prepare_nr-and-swapcache_clear_nr-for-large-folios-swap-in/20240726-181412
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20240726094618.401593-5-21cnbao%40gmail.com
patch subject: [PATCH v5 4/4] mm: Introduce per-thpsize swapin control policy
config: x86_64-randconfig-121-20240727 (https://download.01.org/0day-ci/archive/20240727/202407271351.ffZPMT6W-lkp@intel.com/config)
compiler: gcc-11 (Ubuntu 11.4.0-4ubuntu1) 11.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240727/202407271351.ffZPMT6W-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/202407271351.ffZPMT6W-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> mm/huge_memory.c:83:15: sparse: sparse: symbol 'huge_anon_orders_swapin_always' was not declared. Should it be static?
   mm/huge_memory.c: note: in included file (through include/linux/smp.h, include/linux/lockdep.h, include/linux/spinlock.h, ...):
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   mm/huge_memory.c: note: in included file (through include/linux/mmzone.h, include/linux/gfp.h, include/linux/mm.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
   mm/huge_memory.c:1867:20: sparse: sparse: context imbalance in 'madvise_free_huge_pmd' - unexpected unlock
   include/linux/page-flags.h:235:46: sparse: sparse: self-comparison always evaluates to false
   mm/huge_memory.c:1905:28: sparse: sparse: context imbalance in 'zap_huge_pmd' - unexpected unlock
   mm/huge_memory.c:2016:28: sparse: sparse: context imbalance in 'move_huge_pmd' - unexpected unlock
   mm/huge_memory.c:2156:20: sparse: sparse: context imbalance in 'change_huge_pmd' - unexpected unlock
   mm/huge_memory.c:2306:12: sparse: sparse: context imbalance in '__pmd_trans_huge_lock' - wrong count at exit
   mm/huge_memory.c:2323:12: sparse: sparse: context imbalance in '__pud_trans_huge_lock' - wrong count at exit
   mm/huge_memory.c:2347:28: sparse: sparse: context imbalance in 'zap_huge_pud' - unexpected unlock
   mm/huge_memory.c:2426:18: sparse: sparse: context imbalance in '__split_huge_zero_page_pmd' - unexpected unlock
   mm/huge_memory.c:2640:18: sparse: sparse: context imbalance in '__split_huge_pmd_locked' - unexpected unlock
   include/linux/page-flags.h:235:46: sparse: sparse: self-comparison always evaluates to false
   mm/huge_memory.c: note: in included file (through include/linux/smp.h, include/linux/lockdep.h, include/linux/spinlock.h, ...):
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   mm/huge_memory.c: note: in included file (through include/linux/mmzone.h, include/linux/gfp.h, include/linux/mm.h):
   include/linux/page-flags.h:235:46: sparse: sparse: self-comparison always evaluates to false
   mm/huge_memory.c:3031:30: sparse: sparse: context imbalance in '__split_huge_page' - unexpected unlock
   mm/huge_memory.c:3306:17: sparse: sparse: context imbalance in 'split_huge_page_to_list_to_order' - different lock contexts for basic block
   mm/huge_memory.c: note: in included file (through include/linux/smp.h, include/linux/lockdep.h, include/linux/spinlock.h, ...):
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   mm/huge_memory.c: note: in included file (through include/linux/mmzone.h, include/linux/gfp.h, include/linux/mm.h):
   include/linux/page-flags.h:235:46: sparse: sparse: self-comparison always evaluates to false
   mm/huge_memory.c: note: in included file (through include/linux/smp.h, include/linux/lockdep.h, include/linux/spinlock.h, ...):
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   mm/huge_memory.c: note: in included file (through include/linux/mmzone.h, include/linux/gfp.h, include/linux/mm.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 +/huge_anon_orders_swapin_always +83 mm/huge_memory.c

    51	
    52	/*
    53	 * By default, transparent hugepage support is disabled in order to avoid
    54	 * risking an increased memory footprint for applications that are not
    55	 * guaranteed to benefit from it. When transparent hugepage support is
    56	 * enabled, it is for all mappings, and khugepaged scans all mappings.
    57	 * Defrag is invoked by khugepaged hugepage allocations and by page faults
    58	 * for all hugepage allocations.
    59	 */
    60	unsigned long transparent_hugepage_flags __read_mostly =
    61	#ifdef CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS
    62		(1<<TRANSPARENT_HUGEPAGE_FLAG)|
    63	#endif
    64	#ifdef CONFIG_TRANSPARENT_HUGEPAGE_MADVISE
    65		(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)|
    66	#endif
    67		(1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG)|
    68		(1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG)|
    69		(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG);
    70	
    71	static struct shrinker *deferred_split_shrinker;
    72	static unsigned long deferred_split_count(struct shrinker *shrink,
    73						  struct shrink_control *sc);
    74	static unsigned long deferred_split_scan(struct shrinker *shrink,
    75						 struct shrink_control *sc);
    76	
    77	static atomic_t huge_zero_refcount;
    78	struct folio *huge_zero_folio __read_mostly;
    79	unsigned long huge_zero_pfn __read_mostly = ~0UL;
    80	unsigned long huge_anon_orders_always __read_mostly;
    81	unsigned long huge_anon_orders_madvise __read_mostly;
    82	unsigned long huge_anon_orders_inherit __read_mostly;
  > 83	unsigned long huge_anon_orders_swapin_always __read_mostly;
    84	

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