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-randconfig-012-20231208 (https://download.01.org/0day-ci/archive/20231209/202312090030.s5y0gXnv-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231209/202312090030.s5y0gXnv-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/202312090030.s5y0gXnv-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/mmzone.h:25,
                    from include/linux/gfp.h:7,
                    from include/linux/slab.h:16,
                    from include/linux/crypto.h:17,
                    from arch/x86/kernel/asm-offsets.c:9:
   include/linux/zswap.h: In function 'zswap_swapon':
>> include/linux/zswap.h:53:1: warning: no return statement in function returning non-void [-Wreturn-type]
      53 | static inline int zswap_swapon(int type) {}
         | ^~~~~~
--
   In file included from include/linux/mmzone.h:25,
                    from include/linux/gfp.h:7,
                    from include/linux/umh.h:4,
                    from include/linux/kmod.h:9,
                    from include/linux/module.h:17,
                    from drivers/clk/clkdev.c:9:
   include/linux/zswap.h: In function 'zswap_swapon':
>> include/linux/zswap.h:53:1: warning: no return statement in function returning non-void [-Wreturn-type]
      53 | static inline int zswap_swapon(int type) {}
         | ^~~~~~
   drivers/clk/clkdev.c: In function 'vclkdev_alloc':
   drivers/clk/clkdev.c:173:17: warning: function 'vclkdev_alloc' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
     173 |                 vscnprintf(cla->dev_id, sizeof(cla->dev_id), dev_fmt, ap);
         |                 ^~~~~~~~~~
--
   In file included from include/linux/mmzone.h:25,
                    from include/linux/gfp.h:7,
                    from include/linux/slab.h:16,
                    from include/linux/crypto.h:17,
                    from arch/x86/kernel/asm-offsets.c:9:
   include/linux/zswap.h: In function 'zswap_swapon':
>> include/linux/zswap.h:53:1: warning: no return statement in function returning non-void [-Wreturn-type]
      53 | static inline int zswap_swapon(int type) {}
         | ^~~~~~


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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https://github.com/intel/lkp-tests/wiki