[mmotm:master 265/276] mm/hmm.c:33:0: warning: "SECTION_SIZE" redefined

[kbuild test robot <fengguang.wu@intel.com>]

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tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   5b220005fda0593464fc4549eea586e597bf783c
commit: 89cc4c46458ccdfab15b2fe94a5645766d5091aa [265/276] mm/hmm/devmem: device memory hotplug using ZONE_DEVICE
config: arm64-allmodconfig (attached as .config)
compiler: aarch64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 89cc4c46458ccdfab15b2fe94a5645766d5091aa
        # save the attached .config to linux build tree
        make.cross ARCH=arm64 

All warnings (new ones prefixed by >>):

>> mm/hmm.c:33:0: warning: "SECTION_SIZE" redefined
    #define SECTION_SIZE (1UL << PA_SECTION_SHIFT)
    
   In file included from arch/arm64/include/asm/processor.h:36:0,
                    from arch/arm64/include/asm/spinlock.h:21,
                    from include/linux/spinlock.h:87,
                    from include/linux/mmzone.h:7,
                    from include/linux/gfp.h:5,
                    from include/linux/mm.h:9,
                    from mm/hmm.c:20:
   arch/arm64/include/asm/pgtable-hwdef.h:87:0: note: this is the location of the previous definition
    #define SECTION_SIZE  (_AC(1, UL) << SECTION_SHIFT)
    
   mm/hmm.c: In function 'hmm_devmem_release':
   mm/hmm.c:815:2: error: implicit declaration of function 'arch_remove_memory' [-Werror=implicit-function-declaration]
     arch_remove_memory(align_start, align_size, devmem->pagemap.type);
     ^~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/SECTION_SIZE +33 mm/hmm.c

    17	 * Refer to include/linux/hmm.h for information about heterogeneous memory
    18	 * management or HMM for short.
    19	 */
    20	#include <linux/mm.h>
    21	#include <linux/hmm.h>
    22	#include <linux/rmap.h>
    23	#include <linux/swap.h>
    24	#include <linux/slab.h>
    25	#include <linux/sched.h>
    26	#include <linux/mmzone.h>
    27	#include <linux/pagemap.h>
    28	#include <linux/swapops.h>
    29	#include <linux/hugetlb.h>
    30	#include <linux/memremap.h>
    31	#include <linux/mmu_notifier.h>
    32	
  > 33	#define SECTION_SIZE (1UL << PA_SECTION_SHIFT)
    34	
    35	static const struct mmu_notifier_ops hmm_mmu_notifier_ops;
    36	
    37	
    38	/*
    39	 * struct hmm - HMM per mm struct
    40	 *
    41	 * @mm: mm struct this HMM struct is bound to

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