Hi Mike, I love your patch! Yet something to improve: [auto build test ERROR on arm64/for-next/core] [cannot apply to v5.3 next-20190920] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Mike-Rapoport/arm64-use-generic-free_initrd_mem/20190924-220328 base: https://kernel.googlesource.com/pub/scm/linux/kernel/git/arm64/linux.git for-next/core config: powerpc-allmodconfig (attached as .config) compiler: powerpc64-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag Reported-by: kbuild test robot All errors (new ones prefixed by >>): init/initramfs.c: In function 'free_initrd_mem': >> init/initramfs.c:536:2: error: implicit declaration of function 'memblock_free'; did you mean 'ptlock_free'? [-Werror=implicit-function-declaration] memblock_free(__virt_to_phys(start), end - start); ^~~~~~~~~~~~~ ptlock_free >> init/initramfs.c:536:16: error: implicit declaration of function '__virt_to_phys'; did you mean 'virt_to_phys'? [-Werror=implicit-function-declaration] memblock_free(__virt_to_phys(start), end - start); ^~~~~~~~~~~~~~ virt_to_phys cc1: some warnings being treated as errors vim +536 init/initramfs.c 529 530 void __weak free_initrd_mem(unsigned long start, unsigned long end) 531 { 532 free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, 533 "initrd"); 534 535 #ifdef CONFIG_ARCH_KEEP_MEMBLOCK > 536 memblock_free(__virt_to_phys(start), end - start); 537 #endif 538 } 539 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation