[android-common:android12-kiwi-5.10 272/272] mm/swapfile.c:102:26: warning: no previous prototype for function 'swap_type_to_swap_info'

[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:   9c40f45d2c22f05e45bc48b1d7be869adf7e473a
commit: 4506bcbba5ec78d8d694fbb43e964cfefe900887 [272/272] ANDROID: mm: export swap_type_to_swap_info
config: x86_64-randconfig-r072-20260813 (https://download.01.org/0day-ci/archive/20260813/202608130648.IyLIIOZF-lkp@intel.com/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 6ea395e4fe4db26920d57779ddae98eac6ba945d)
smatch: v0.5.0-9187-g5189e3fb
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260813/202608130648.IyLIIOZF-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/202608130648.IyLIIOZF-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from <built-in>:2:
   In file included from include/linux/compiler_types.h:69:
   include/linux/compiler-clang.h:34:9: warning: '__SANITIZE_ADDRESS__' macro redefined [-Wmacro-redefined]
      34 | #define __SANITIZE_ADDRESS__
         |         ^
   <built-in>:357:9: note: previous definition is here
     357 | #define __SANITIZE_ADDRESS__ 1
         |         ^
>> 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 
   2 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 SND_VMASTER
   Depends on [n]: SOUND [=y] && !UML && SND [=n]
   Selected by [y]:
   - GKI_HIDDEN_SND_CONFIGS [=y]
   WARNING: unmet direct dependencies detected for SND_PCM_IEC958
   Depends on [n]: SOUND [=y] && !UML && SND [=n]
   Selected by [y]:
   - GKI_HIDDEN_SND_SOC_CONFIGS [=y]
   WARNING: unmet direct dependencies detected for SND_JACK
   Depends on [n]: SOUND [=y] && !UML && SND [=n]
   Selected by [y]:
   - GKI_HIDDEN_SND_CONFIGS [=y]
   WARNING: unmet direct dependencies detected for SND_JACK_INPUT_DEV
   Depends on [n]: SOUND [=y] && !UML && SND [=n] && SND_JACK [=y]
   Selected by [y]:
   - GKI_HIDDEN_SND_CONFIGS [=y]
   WARNING: unmet direct dependencies detected for SND_PCM_ELD
   Depends on [n]: SOUND [=y] && !UML && SND [=n]
   Selected by [y]:
   - GKI_HIDDEN_SND_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]
   WARNING: unmet direct dependencies detected for SND_INTEL_NHLT
   Depends on [n]: SOUND [=y] && !UML && SND [=n]
   Selected by [y]:
   - GKI_HIDDEN_SND_CONFIGS [=y] && ACPI [=y]


vim +/swap_type_to_swap_info +102 mm/swapfile.c

   101	
 > 102	struct swap_info_struct *swap_type_to_swap_info(int type)
   103	{
   104		if (type >= READ_ONCE(nr_swapfiles))
   105			return NULL;
   106	
   107		smp_rmb();	/* Pairs with smp_wmb in alloc_swap_info. */
   108		return READ_ONCE(swap_info[type]);
   109	}
   110	EXPORT_SYMBOL_GPL(swap_type_to_swap_info);
   111	

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