Re: [PATCH 1/7] mm/zswap: make sure each swapfile always have zswap rb-tree

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

Hi Chengming,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 0f5f12ac05f36f117e793656c3f560625e927f1b]

url:    https://github.com/intel-lab-lkp/linux/commits/Chengming-Zhou/mm-zswap-make-sure-each-swapfile-always-have-zswap-rb-tree/20231206-174717
base:   0f5f12ac05f36f117e793656c3f560625e927f1b
patch link:    https://lore.kernel.org/r/20231206-zswap-lock-optimize-v1-1-e25b059f9c3a%40bytedance.com
patch subject: [PATCH 1/7] mm/zswap: make sure each swapfile always have zswap rb-tree
config: i386-buildonly-randconfig-002-20231208 (https://download.01.org/0day-ci/archive/20231208/202312082309.xvC0Rdd9-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231208/202312082309.xvC0Rdd9-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/202312082309.xvC0Rdd9-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from arch/x86/kernel/asm-offsets.c:9:
   In file included from include/linux/crypto.h:17:
   In file included from include/linux/slab.h:16:
   In file included from include/linux/gfp.h:7:
   In file included from include/linux/mmzone.h:25:
>> include/linux/zswap.h:53:43: warning: non-void function does not return a value [-Wreturn-type]
   static inline int zswap_swapon(int type) {}
                                             ^
   1 warning generated.
--
   In file included from arch/x86/mm/pat/set_memory.c:6:
   In file included from include/linux/highmem.h:5:
   In file included from include/linux/fs.h:13:
   In file included from include/linux/list_lru.h:14:
   In file included from include/linux/xarray.h:15:
   In file included from include/linux/gfp.h:7:
   In file included from include/linux/mmzone.h:25:
>> include/linux/zswap.h:53:43: warning: non-void function does not return a value [-Wreturn-type]
   static inline int zswap_swapon(int type) {}
                                             ^
   arch/x86/mm/pat/set_memory.c:217:1: warning: unused function 'within_inclusive' [-Wunused-function]
   within_inclusive(unsigned long addr, unsigned long start, unsigned long end)
   ^
   2 warnings generated.
--
   In file included from arch/x86/kernel/asm-offsets.c:9:
   In file included from include/linux/crypto.h:17:
   In file included from include/linux/slab.h:16:
   In file included from include/linux/gfp.h:7:
   In file included from include/linux/mmzone.h:25:
>> include/linux/zswap.h:53:43: warning: non-void function does not return a value [-Wreturn-type]
   static inline int zswap_swapon(int type) {}
                                             ^
   1 warning generated.


vim +53 include/linux/zswap.h

    51	
    52	static inline void zswap_invalidate(int type, pgoff_t offset) {}
  > 53	static inline int zswap_swapon(int type) {}
    54	static inline void zswap_swapoff(int type) {}
    55	static inline void zswap_memcg_offline_cleanup(struct mem_cgroup *memcg) {}
    56	static inline void zswap_lruvec_state_init(struct lruvec *lruvec) {}
    57	static inline void zswap_page_swapin(struct page *page) {}
    58	#endif
    59	

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