Hi Yizhen, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-5.10 head: ffc5791ca9102a55d29c6dea26de38d32f052b01 commit: 79b60243a9ff771b76add8e16cfe55cc4f5edef2 [18718/30000] ub: uburma add cmd create jfr implementation. config: arm64-randconfig-003-20241029 (https://download.01.org/0day-ci/archive/20241030/202410300700.74552znZ-lkp@i...) compiler: aarch64-linux-gcc (GCC) 14.1.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241030/202410300700.74552znZ-lkp@i...) 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/202410300700.74552znZ-lkp@intel.com/ All warnings (new ones prefixed by >>): drivers/ub/urma/uburma/uburma_cmd.c:144:6: warning: no previous prototype for 'uburma_jfs_event_cb' [-Wmissing-prototypes] 144 | void uburma_jfs_event_cb(struct ubcore_event *event, struct ubcore_ucontext *ctx) | ^~~~~~~~~~~~~~~~~~~

...

drivers/ub/urma/uburma/uburma_cmd.c:156:6: warning: no previous prototype for 'uburma_jfr_event_cb' [-Wmissing-prototypes] 156 | void uburma_jfr_event_cb(struct ubcore_event *event, struct ubcore_ucontext *ctx) | ^~~~~~~~~~~~~~~~~~~

vim +/uburma_jfr_event_cb +156 drivers/ub/urma/uburma/uburma_cmd.c 155

156 void uburma_jfr_event_cb(struct ubcore_event *event, struct ubcore_ucontext *ctx) 157 { 158 struct uburma_jfr_uobj *jfr_uobj; 159 160 if (event->element.jfr == NULL) 161 return; 162 163 jfr_uobj = (struct uburma_jfr_uobj *)event->element.jfr->jfr_cfg.jfr_context; 164 uburma_write_async_event(ctx, event->element.jfr->urma_jfr, event->event_type, 165 &jfr_uobj->async_event_list, &jfr_uobj->async_events_reported); 166 } 167

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