Hi Kefeng, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v5.11-rc3 next-20210113] [cannot apply to soc/for-next arm/for-next linux/master] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Kefeng-Wang/initramfs-Provide-a-... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e609571b5ffa3528bf85292de1ceaddac342bc1c config: i386-tinyconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/1336e01e9195f537da5a004080c0cf9f2... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Kefeng-Wang/initramfs-Provide-a-common-initrd-reserve-function/20210113-224338 git checkout 1336e01e9195f537da5a004080c0cf9f265678d7 # save the attached .config to linux build tree make W=1 ARCH=i386 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 >>): In file included from arch/x86/include/asm/microcode.h:7, from arch/x86/mm/init.c:22: 21 | static inline void __init reserve_initrd_mem(void) {} | ^~~~~~~~~~~~~~~~~~ In file included from arch/x86/mm/init.c:2: include/linux/initrd.h:21:27: note: previous definition of 'reserve_initrd_mem' was here 21 | static inline void __init reserve_initrd_mem(void) {} | ^~~~~~~~~~~~~~~~~~ vim +/reserve_initrd_mem +21 include/linux/initrd.h 17 18 #ifdef CONFIG_BLK_DEV_INITRD 19 extern void __init reserve_initrd_mem(void); 20 #else 22 #endif 23 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org