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@xxxxxxxxx/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@xxxxxxxxx/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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202312090030.s5y0gXnv-lkp@xxxxxxxxx/ 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 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
