tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 7a6956579ce6950890ea706f6fcf7874a7981f50 commit: 17132da70eb766785b9b4677bacce18cc11ea442 [1851/4903] ARM: samsung: move pm check code to drivers/soc config: arm-randconfig-r001-20200908 (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0 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 git checkout 17132da70eb766785b9b4677bacce18cc11ea442 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 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/soc/samsung/s3c-pm-debug.c: In function 's3c_pm_dbg': drivers/soc/samsung/s3c-pm-debug.c:30:2: warning: function 's3c_pm_dbg' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 30 | vsnprintf(buff, sizeof(buff), fmt, va); | ^~~~~~~~~ drivers/soc/samsung/s3c-pm-debug.c: In function 's3c_pm_uart_base': 41 | debug_ll_addr(&paddr, &vaddr); | ^~~~~~~~~~~~~ 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 17132da70eb766785b9b4677bacce18cc11ea442 vim +/debug_ll_addr +41 drivers/soc/samsung/s3c-pm-debug.c 72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18 35 72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18 36 static inline void __iomem *s3c_pm_uart_base(void) 72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18 37 { 72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18 38 unsigned long paddr; 72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18 39 unsigned long vaddr; 72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18 40 72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18 @41 debug_ll_addr(&paddr, &vaddr); 72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18 42 72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18 43 return (void __iomem *)vaddr; 72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18 44 } 72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18 45 :::::: The code at line 41 was first introduced by commit :::::: 72551f6cf13e2f3a1d273b7007b5d7d7fd69c554 ARM: SAMSUNG: Move Samsung PM debug code into separate file :::::: TO: Tomasz Figa <t.figa(a)samsung.com&gt; :::::: CC: Kukjin Kim <kgene.kim(a)samsung.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org