[ammarfaizi2-block:bpf/bpf-next/master 251/258] kernel/bpf/core.c:847:9: error: use of undeclared identifier 'PMD_SIZE'

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/ammarfaizi2/linux-block bpf/bpf-next/master
head:   7ada3787e91c89b0aa7abf47682e8e587b855c13
commit: ef078600eec20f20eb7833cf597d4a5edf2953c1 [251/258] bpf: Select proper size for bpf_prog_pack
config: arm-randconfig-c002-20220321 (https://download.01.org/0day-ci/archive/20220321/202203212309.ifp4edvz-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 85e9b2687a13d1908aa86d1b89c5ce398a06cd39)
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 arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/ammarfaizi2/linux-block/commit/ef078600eec20f20eb7833cf597d4a5edf2953c1
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block bpf/bpf-next/master
        git checkout ef078600eec20f20eb7833cf597d4a5edf2953c1
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

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 >>):

>> kernel/bpf/core.c:847:9: error: use of undeclared identifier 'PMD_SIZE'
           size = PMD_SIZE * num_online_nodes();
                  ^
   kernel/bpf/core.c:1629:12: warning: no previous prototype for function 'bpf_probe_read_kernel' [-Wmissing-prototypes]
   u64 __weak bpf_probe_read_kernel(void *dst, u32 size, const void *unsafe_ptr)
              ^
   kernel/bpf/core.c:1629:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   u64 __weak bpf_probe_read_kernel(void *dst, u32 size, const void *unsafe_ptr)
   ^
   static 
   1 warning and 1 error generated.


vim +/PMD_SIZE +847 kernel/bpf/core.c

   841	
   842	static size_t select_bpf_prog_pack_size(void)
   843	{
   844		size_t size;
   845		void *ptr;
   846	
 > 847		size = PMD_SIZE * num_online_nodes();
   848		ptr = module_alloc(size);
   849	
   850		/* Test whether we can get huge pages. If not just use PAGE_SIZE
   851		 * packs.
   852		 */
   853		if (!ptr || !is_vm_area_hugepages(ptr))
   854			size = PAGE_SIZE;
   855	
   856		vfree(ptr);
   857		return size;
   858	}
   859	

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