Hi Tom, I love your patch! Perhaps something to improve: [auto build test WARNING on staging/staging-testing] url: https://github.com/intel-lab-lkp/linux/commits/Tom-Rix/staging-vchiq_arm-change-vchiq_platform_init-from-global-to-static/20220419-004611 base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git bed6d200f8ca38e1ecbdd8fb7e0564884002abd1 config: sparc-randconfig-c004-20220417 (https://download.01.org/0day-ci/archive/20220419/202204190650.yy0x0YCl-lkp@xxxxxxxxx/config) compiler: sparc64-linux-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/intel-lab-lkp/linux/commit/192ca8cdfd692f17162557c64e8d533c816eccff git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Tom-Rix/staging-vchiq_arm-change-vchiq_platform_init-from-global-to-static/20220419-004611 git checkout 192ca8cdfd692f17162557c64e8d533c816eccff # 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=sparc SHELL=/bin/bash drivers/staging/vc04_services/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): In file included from include/linux/string.h:20, from include/linux/bitmap.h:11, from include/linux/cpumask.h:12, from include/linux/mm_types_task.h:14, from include/linux/mm_types.h:5, from include/linux/buildid.h:5, from include/linux/module.h:14, from drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:8: In function 'memcpy_to_page', inlined from 'free_pagelist' at drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:434:4: >> arch/sparc/include/asm/string.h:15:25: warning: argument 2 null where non-null expected [-Wnonnull] 15 | #define memcpy(t, f, n) __builtin_memcpy(t, f, n) | ^~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/highmem.h:353:9: note: in expansion of macro 'memcpy' 353 | memcpy(to + offset, from, len); | ^~~~~~ drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c: In function 'free_pagelist': arch/sparc/include/asm/string.h:15:25: note: in a call to built-in function '__builtin_memcpy' 15 | #define memcpy(t, f, n) __builtin_memcpy(t, f, n) | ^~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/highmem.h:353:9: note: in expansion of macro 'memcpy' 353 | memcpy(to + offset, from, len); | ^~~~~~ In function 'memcpy_to_page', inlined from 'free_pagelist' at drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:441:4: arch/sparc/include/asm/string.h:15:25: warning: '__builtin_memcpy' offset 0 is out of the bounds [0, 0] [-Warray-bounds] 15 | #define memcpy(t, f, n) __builtin_memcpy(t, f, n) | ^~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/highmem.h:353:9: note: in expansion of macro 'memcpy' 353 | memcpy(to + offset, from, len); | ^~~~~~ vim +15 arch/sparc/include/asm/string.h 70a6fcf3283a0a Al Viro 2016-01-17 13 70a6fcf3283a0a Al Viro 2016-01-17 14 #define __HAVE_ARCH_MEMCPY 70a6fcf3283a0a Al Viro 2016-01-17 @15 #define memcpy(t, f, n) __builtin_memcpy(t, f, n) 70a6fcf3283a0a Al Viro 2016-01-17 16 -- 0-DAY CI Kernel Test Service https://01.org/lkp
