[linux-next:master 5141/5361] include/linux/hmm.h:102:22: error: field 'mmu_notifier' has incomplete type

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   9fe36dd579c794ae5f1c236293c55fb6847e9654
commit: a3402cb621c1b3908600d3f364e991a6c5a8c06e [5141/5361] mm/hmm: improve driver API to work and wait over a range
config: x86_64-randconfig-b0-02012138 (attached as .config)
compiler: gcc-8 (Debian 8.2.0-14) 8.2.0
reproduce:
        git checkout a3402cb621c1b3908600d3f364e991a6c5a8c06e
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   In file included from kernel/memremap.c:14:
>> include/linux/hmm.h:102:22: error: field 'mmu_notifier' has incomplete type
     struct mmu_notifier mmu_notifier;
                         ^~~~~~~~~~~~

vim +/mmu_notifier +102 include/linux/hmm.h

    81	
    82	
    83	/*
    84	 * struct hmm - HMM per mm struct
    85	 *
    86	 * @mm: mm struct this HMM struct is bound to
    87	 * @lock: lock protecting ranges list
    88	 * @ranges: list of range being snapshotted
    89	 * @mirrors: list of mirrors for this mm
    90	 * @mmu_notifier: mmu notifier to track updates to CPU page table
    91	 * @mirrors_sem: read/write semaphore protecting the mirrors list
    92	 * @wq: wait queue for user waiting on a range invalidation
    93	 * @notifiers: count of active mmu notifiers
    94	 * @dead: is the mm dead ?
    95	 */
    96	struct hmm {
    97		struct mm_struct	*mm;
    98		struct kref		kref;
    99		struct mutex		lock;
   100		struct list_head	ranges;
   101		struct list_head	mirrors;
 > 102		struct mmu_notifier	mmu_notifier;
   103		struct rw_semaphore	mirrors_sem;
   104		wait_queue_head_t	wq;
   105		long			notifiers;
   106		bool			dead;
   107	};
   108	

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