Hi Michal,

I love your patch! Perhaps something to improve:

[auto build test WARNING on hnaz-mm/master]

url:    https://github.com/0day-ci/linux/commits/Michal-Hocko/mm-memory_hotplug-make-arch_alloc_nodedata-independent-on-CONFIG_MEMORY_HOTPLUG/20211214-190817
base:   https://github.com/hnaz/linux-mm master
config: ia64-defconfig (https://download.01.org/0day-ci/archive/20211215/202112151219.xAI8NaQR-lkp@intel.com/config)
compiler: ia64-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/0day-ci/linux/commit/65c560a3ac2561750c1dc71213f042e660b9bbc0
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Michal-Hocko/mm-memory_hotplug-make-arch_alloc_nodedata-independent-on-CONFIG_MEMORY_HOTPLUG/20211214-190817
        git checkout 65c560a3ac2561750c1dc71213f042e660b9bbc0
        # 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=ia64 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> WARNING: modpost: vmlinux.o(.text+0x566a2): Section mismatch in reference from the function arch_alloc_nodedata() to the function .init.text:memblock_alloc_try_nid()
The function arch_alloc_nodedata() references
the function __init memblock_alloc_try_nid().
This is often because arch_alloc_nodedata lacks a __init
annotation or the annotation of memblock_alloc_try_nid is wrong.

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org