[android-common:android12-kiwi-5.10 0/91] mm/swap_slots.c:93:6: warning: no previous prototype for function 'check_cache_active'

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

Hi Bing,

FYI, the error/warning still remains.

tree:   https://android.googlesource.com/kernel/common android12-kiwi-5.10
head:   d54a4869d416b5e3beebfa0e94bc0e2cd7568737
commit: 06c2766cbc9923d67d45fc191c467b5e2685175d [0/91] ANDROID: mm: export symbols used in vendor hook android_vh_get_swap_page()
config: x86_64-buildonly-randconfig-001-20250214 (https://download.01.org/0day-ci/archive/20250215/202502150119.bRZ6hQju-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250215/202502150119.bRZ6hQju-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/202502150119.bRZ6hQju-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from mm/swap_slots.c:30:
   In file included from include/linux/swap_slots.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:13:
   In file included from include/linux/cgroup.h:29:
   In file included from include/linux/cgroup-defs.h:22:
   In file included from include/linux/bpf-cgroup.h:5:
   In file included from include/linux/bpf.h:21:
   In file included from include/linux/kallsyms.h:12:
   In file included from include/linux/mm.h:1593:
   include/linux/vmstat.h:431:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     431 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> mm/swap_slots.c:93:6: warning: no previous prototype for function 'check_cache_active' [-Wmissing-prototypes]
      93 | bool check_cache_active(void)
         |      ^
   mm/swap_slots.c:93:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
      93 | bool check_cache_active(void)
         | ^
         | static 
   2 warnings generated.
--
   In file included from mm/swapfile.c:9:
   In file included from include/linux/mm.h:1593:
   include/linux/vmstat.h:431:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     431 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   mm/swapfile.c:102:26: warning: no previous prototype for function 'swap_type_to_swap_info' [-Wmissing-prototypes]
     102 | struct swap_info_struct *swap_type_to_swap_info(int type)
         |                          ^
   mm/swapfile.c:102:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     102 | struct swap_info_struct *swap_type_to_swap_info(int type)
         | ^
         | static 
>> mm/swapfile.c:775:5: warning: no previous prototype for function 'scan_swap_map_slots' [-Wmissing-prototypes]
     775 | int scan_swap_map_slots(struct swap_info_struct *si,
         |     ^
   mm/swapfile.c:775:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     775 | int scan_swap_map_slots(struct swap_info_struct *si,
         | ^
         | static 
>> mm/swapfile.c:993:5: warning: no previous prototype for function 'swap_alloc_cluster' [-Wmissing-prototypes]
     993 | int swap_alloc_cluster(struct swap_info_struct *si, swp_entry_t *slot)
         |     ^
   mm/swapfile.c:993:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     993 | int swap_alloc_cluster(struct swap_info_struct *si, swp_entry_t *slot)
         | ^
         | static 
   4 warnings generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for DRM_MIPI_DSI
   Depends on [n]: HAS_IOMEM [=y] && DRM [=n]
   Selected by [y]:
   - GKI_HIDDEN_DRM_CONFIGS [=y]
   WARNING: unmet direct dependencies detected for DRM_KMS_CMA_HELPER
   Depends on [n]: HAS_IOMEM [=y] && DRM [=n]
   Selected by [y]:
   - GKI_HIDDEN_DRM_CONFIGS [=y]
   WARNING: unmet direct dependencies detected for DRM_GEM_CMA_HELPER
   Depends on [n]: HAS_IOMEM [=y] && DRM [=n]
   Selected by [y]:
   - GKI_HIDDEN_DRM_CONFIGS [=y]


vim +/check_cache_active +93 mm/swap_slots.c

    92	
  > 93	bool check_cache_active(void)
    94	{
    95		long pages;
    96	
    97		if (!swap_slot_cache_enabled)
    98			return false;
    99	
   100		pages = get_nr_swap_pages();
   101		if (!swap_slot_cache_active) {
   102			if (pages > num_online_cpus() *
   103			    THRESHOLD_ACTIVATE_SWAP_SLOTS_CACHE)
   104				reactivate_swap_slots_cache();
   105			goto out;
   106		}
   107	
   108		/* if global pool of slot caches too low, deactivate cache */
   109		if (pages < num_online_cpus() * THRESHOLD_DEACTIVATE_SWAP_SLOTS_CACHE)
   110			deactivate_swap_slots_cache();
   111	out:
   112		return swap_slot_cache_active;
   113	}
   114	EXPORT_SYMBOL_GPL(check_cache_active);
   115	

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