Hi Mauro, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: b652d2a5f2a4e93d803cc33eb57fdc41ee528500 commit: 72a9ff3bf7fbd7e887d4e6bbc1c04817da2b9887 [5086/9028] media: atomisp: get rid of -Wsuggest-attribute=format warnings config: i386-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): git checkout 72a9ff3bf7fbd7e887d4e6bbc1c04817da2b9887 # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/staging/media/atomisp/pci/atomisp_compat_css20.c: In function '__set_css_print_env': 861 | isp->css_env.isp_css_env.print_env.debug_print = vprintk; | ^ drivers/staging/media/atomisp/pci/atomisp_compat_css20.c: In function 'atomisp_css_load_firmware': drivers/staging/media/atomisp/pci/atomisp_compat_css20.c:894:49: error: assignment to 'int (*)(const char *, char *)' from incompatible pointer type 'int (__attribute__((regparm(0))) *)(const char *, char *)' [-Werror=incompatible-pointer-types] 894 | isp->css_env.isp_css_env.print_env.error_print = vprintk; | ^ cc1: some warnings being treated as errors # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 72a9ff3bf7fbd7e887d4e6bbc1c04817da2b9887 vim +861 drivers/staging/media/atomisp/pci/atomisp_compat_css20.c 850 851 static inline int __set_css_print_env(struct atomisp_device *isp, int opt) 852 { 853 int ret = 0; 854 855 if (opt == 0) 856 isp->css_env.isp_css_env.print_env.debug_print = NULL; 857 else if (opt == 1) 858 isp->css_env.isp_css_env.print_env.debug_print = 859 atomisp_css2_dbg_ftrace_print; 860 else if (opt == 2) 862 else 863 ret = -EINVAL; 864 865 return ret; 866 } 867 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org