Hi Tianyi, kernel test robot noticed the following build warnings: [auto build test WARNING on 8a749fd1a8720d4619c91c8b6e7528c0a355c0aa] url: https://github.com/intel-lab-lkp/linux/commits/Tianyi-Liu/KVM-Add-arch-specific-interfaces-for-sampling-guest-callchains/20231008-230042 base: 8a749fd1a8720d4619c91c8b6e7528c0a355c0aa patch link: https://lore.kernel.org/r/SY4P282MB10840154D4F09917D6528BC69DCFA%40SY4P282MB1084.AUSP282.PROD.OUTLOOK.COM patch subject: [PATCH v2 1/5] KVM: Add arch specific interfaces for sampling guest callchains config: arm64-randconfig-003-20231009 (https://download.01.org/0day-ci/archive/20231009/202310090448.ffbVfkHi-lkp@xxxxxxxxx/config) compiler: aarch64-linux-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231009/202310090448.ffbVfkHi-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202310090448.ffbVfkHi-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): In file included from include/uapi/linux/posix_types.h:5, from include/uapi/linux/types.h:14, from include/linux/types.h:6, from include/linux/kasan-checks.h:5, from include/asm-generic/rwonce.h:26, from arch/arm64/include/asm/rwonce.h:71, from include/linux/compiler.h:246, from include/asm-generic/bug.h:5, from arch/arm64/include/asm/bug.h:26, from include/linux/bug.h:5, from arch/arm64/kvm/arm.c:7: arch/arm64/kvm/arm.c: In function 'kvm_arch_vcpu_get_frame_pointer': >> include/linux/stddef.h:8:14: warning: returning 'void *' from a function with return type 'long unsigned int' makes integer from pointer without a cast [-Wint-conversion] 8 | #define NULL ((void *)0) | ^ arch/arm64/kvm/arm.c:578:16: note: in expansion of macro 'NULL' 578 | return NULL; | ^~~~ vim +8 include/linux/stddef.h ^1da177e4c3f41 Linus Torvalds 2005-04-16 6 ^1da177e4c3f41 Linus Torvalds 2005-04-16 7 #undef NULL ^1da177e4c3f41 Linus Torvalds 2005-04-16 @8 #define NULL ((void *)0) 6e218287432472 Richard Knutsson 2006-09-30 9 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
