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: parisc-buildonly-randconfig-r004-20220417 (https://download.01.org/0day-ci/archive/20220419/202204190737.qhFLAafo-lkp@xxxxxxxxx/config) compiler: hppa-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=parisc 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 drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:16: In function 'memcpy_to_page', inlined from 'free_pagelist' at drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:434:4: >> include/linux/highmem.h:353:9: warning: argument 2 null where non-null expected [-Wnonnull] 353 | memcpy(to + offset, from, len); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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: drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c: In function 'free_pagelist': arch/parisc/include/asm/string.h:9:8: note: in a call to function 'memcpy' declared 'nonnull' 9 | void * memcpy(void * dest,const void *src,size_t count); | ^~~~~~ In file included from drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:16: In function 'memcpy_to_page', inlined from 'free_pagelist' at drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:441:4: >> include/linux/highmem.h:353:9: warning: 'memcpy' offset 0 is out of the bounds [0, 0] [-Warray-bounds] 353 | memcpy(to + offset, from, len); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +353 include/linux/highmem.h bb90d4bc7b6a53 Ira Weiny 2021-02-09 346 bb90d4bc7b6a53 Ira Weiny 2021-02-09 347 static inline void memcpy_to_page(struct page *page, size_t offset, bb90d4bc7b6a53 Ira Weiny 2021-02-09 348 const char *from, size_t len) bb90d4bc7b6a53 Ira Weiny 2021-02-09 349 { 61b205f579911a Ira Weiny 2021-02-09 350 char *to = kmap_local_page(page); bb90d4bc7b6a53 Ira Weiny 2021-02-09 351 ca18f6ea012bf3 Ira Weiny 2021-02-10 352 VM_BUG_ON(offset + len > PAGE_SIZE); bb90d4bc7b6a53 Ira Weiny 2021-02-09 @353 memcpy(to + offset, from, len); 8dad53a11f8d94 Christoph Hellwig 2021-07-23 354 flush_dcache_page(page); 61b205f579911a Ira Weiny 2021-02-09 355 kunmap_local(to); bb90d4bc7b6a53 Ira Weiny 2021-02-09 356 } bb90d4bc7b6a53 Ira Weiny 2021-02-09 357 -- 0-DAY CI Kernel Test Service https://01.org/lkp
