On Tue, 1 Mar 2022 20:11:04 +0800 kernel test robot <lkp@xxxxxxxxx> wrote: > tree: https://github.com/hnaz/linux-mm master > head: a46912c14343fd3269cc133494988af90b377d9f > commit: b314f622e664eb263ea03ef7f4580e37146f123f [272/379] kallsyms: enhance %pS/s/b printing when KALLSYSMS is disabled > config: arm-eseries_pxa_defconfig (https://download.01.org/0day-ci/archive/20220301/202203012040.uFWGm3My-lkp@xxxxxxxxx/config) > compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0 > reproduce (this is a W=1 build): > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # https://github.com/hnaz/linux-mm/commit/b314f622e664eb263ea03ef7f4580e37146f123f > git remote add hnaz-mm https://github.com/hnaz/linux-mm > git fetch --no-tags hnaz-mm master > git checkout b314f622e664eb263ea03ef7f4580e37146f123f > # save the config file to linux build tree > mkdir build_dir > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arm SHELL=/bin/bash > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <lkp@xxxxxxxxx> > > All warnings (new ones prefixed by >>): > > lib/vsprintf.c: In function 'sprint_module_info': > >> lib/vsprintf.c:991:13: warning: variable 'modbuildid' set but not used [-Wunused-but-set-variable] > 991 | int modbuildid = 0; > | ^~~~~~~~~~ Do we care about this? [-Wunused-but-set-variable isn't normally set. Under what circumstances does it get set in your setup? I did this: --- a/lib/vsprintf.c~kallsyms-enhance-%ps-s-b-printing-when-kallsysms-is-disabled-fix +++ a/lib/vsprintf.c @@ -988,7 +988,7 @@ static int sprint_module_info(char *buf, unsigned long base; int ret = 0; const char *modname; - int modbuildid = 0; + int modbuildid __maybe_unused = 0; int len; #if IS_ENABLED(CONFIG_STACKTRACE_BUILD_ID) const unsigned char *buildid = NULL; _ > lib/vsprintf.c: In function 'va_format': > lib/vsprintf.c:1759:9: warning: function 'va_format' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] > 1759 | buf += vsnprintf(buf, end > buf ? end - buf : 0, va_fmt->fmt, va); > | ^~~ I wonder what this means.
