Hi Janosch, On Tue, Sep 08, 2020 at 05:56:19AM +0800, kernel test robot wrote: > All warnings (new ones prefixed by >>): > > >> arch/s390/mm/fault.c:862:6: warning: no previous prototype for 'do_secure_storage_violation' [-Wmissing-prototypes] > 862 | void do_secure_storage_violation(struct pt_regs *regs) > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ > > # https://github.com/0day-ci/linux/commit/4aee662164217d48d050e0d9cf57a2cb2cdeaa8a > git remote add linux-review https://github.com/0day-ci/linux > git fetch --no-tags linux-review Janosch-Frank/s390x-pv-Fixes-and-improvements/20200908-021233 > git checkout 4aee662164217d48d050e0d9cf57a2cb2cdeaa8a > vim +/do_secure_storage_violation +862 arch/s390/mm/fault.c > > 861 > > 862 void do_secure_storage_violation(struct pt_regs *regs) To get rid of this warning, please add the function prototype to arch/s390/kernel/entry.h. Like we have them for all other program check handlers for this reason as well.