Re: [PATCH 4/9] mm/mmap: use hotplug_memory_notifier() directly

[kernel test robot <lkp@xxxxxxxxx>]

Hi Liu,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/Liu-Shixin/mm-Use-hotplug_memory_notifier-instead-of-register_hotmemory_notifier/20220919-160043
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
config: arm64-randconfig-r036-20220919 (https://download.01.org/0day-ci/archive/20220920/202209200009.uVNUOZp9-lkp@xxxxxxxxx/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920)
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
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/f147c36bfc42b2f7ee738305544169ddeae003e8
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Liu-Shixin/mm-Use-hotplug_memory_notifier-instead-of-register_hotmemory_notifier/20220919-160043
        git checkout f147c36bfc42b2f7ee738305544169ddeae003e8
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

>> mm/mmap.c:3749:30: error: expected identifier or '('
           if (hotplug_memory_notifier(&reserve_mem_notifier, 0))
                                       ^
>> mm/mmap.c:3749:6: error: use of undeclared identifier 'reserve_mem_notifier_mem_nb'
           if (hotplug_memory_notifier(&reserve_mem_notifier, 0))
               ^
   include/linux/memory.h:167:28: note: expanded from macro 'hotplug_memory_notifier'
           register_memory_notifier(&fn##_mem_nb);                 \
                                     ^
   <scratch space>:58:1: note: expanded from here
   reserve_mem_notifier_mem_nb
   ^
   2 errors generated.


vim +3749 mm/mmap.c

  3746	
  3747	static int __meminit init_reserve_notifier(void)
  3748	{
> 3749		if (hotplug_memory_notifier(&reserve_mem_notifier, 0))

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