Hi Kefeng,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on next-20210701]

url:    https://github.com/0day-ci/linux/commits/Kefeng-Wang/arm64-support-page-mapping-percpu-first-chunk-allocator/20210705-190907
base:    fb0ca446157a86b75502c1636b0d81e642fe6bf1
config: powerpc-randconfig-r011-20210705 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 3f9bf9f42a9043e20c6d2a74dd4f47a90a7e2b41)
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 powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # https://github.com/0day-ci/linux/commit/5f6b5a402ed3e390563ddbddf12973470fd4886d
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Kefeng-Wang/arm64-support-page-mapping-percpu-first-chunk-allocator/20210705-190907
        git checkout 5f6b5a402ed3e390563ddbddf12973470fd4886d
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc 

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

All errors (new ones prefixed by >>):

>> mm/vmalloc.c:2252:2: error: implicit declaration of function 'kasan_populate_early_vm_area_shadow' [-Werror,-Wimplicit-function-declaration]
           kasan_populate_early_vm_area_shadow(vm->addr, vm->size);
           ^
   1 error generated.


vim +/kasan_populate_early_vm_area_shadow +2252 mm/vmalloc.c

  2226	
  2227	/**
  2228	 * vm_area_register_early - register vmap area early during boot
  2229	 * @vm: vm_struct to register
  2230	 * @align: requested alignment
  2231	 *
  2232	 * This function is used to register kernel vm area before
  2233	 * vmalloc_init() is called.  @vm->size and @vm->flags should contain
  2234	 * proper values on entry and other fields should be zero.  On return,
  2235	 * vm->addr contains the allocated address.
  2236	 *
  2237	 * DO NOT USE THIS FUNCTION UNLESS YOU KNOW WHAT YOU'RE DOING.
  2238	 */
  2239	void __init vm_area_register_early(struct vm_struct *vm, size_t align)
  2240	{
  2241		unsigned long vm_start = VMALLOC_START;
  2242		struct vm_struct *tmp;
  2243		unsigned long addr;
  2244	
  2245		for (tmp = vmlist; tmp; tmp = tmp->next)
  2246			vm_start = (unsigned long)tmp->addr + tmp->size;
  2247	
  2248		addr = ALIGN(vm_start, align);
  2249		vm->addr = (void *)addr;
  2250	
  2251		vm_area_add_early(vm);
> 2252		kasan_populate_early_vm_area_shadow(vm->addr, vm->size);
  2253	}
  2254	

---
0-DAY CI Kernel Test Service, Intel Corporation
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