[s390:features 15/18] arch/s390/mm/gmap.c:106:3: error: 'gmap_asce' undeclared

[kbuild test robot <fengguang.wu@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git features
head:   ad64a2c4bdd14f548c2579fb2b16f6ee165300a3
commit: 2b4a587524258c315c065cd1236a9174caf17686 [15/18] s390/mm,kvm: flush gmap address space with IDTE
config: s390-allmodconfig (attached as .config)
compiler: s390x-linux-gnu-gcc (Debian 5.4.0-6) 5.4.0 20160609
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 2b4a587524258c315c065cd1236a9174caf17686
        # save the attached .config to linux build tree
        make.cross ARCH=s390 

All error/warnings (new ones prefixed by >>):

   arch/s390/mm/gmap.c: In function 'gmap_alloc':
>> arch/s390/mm/gmap.c:38:16: warning: unused variable 'gmap_asce' [-Wunused-variable]
     unsigned long gmap_asce;
                   ^
   arch/s390/mm/gmap.c: In function 'gmap_create':
>> arch/s390/mm/gmap.c:106:3: error: 'gmap_asce' undeclared (first use in this function)
      gmap_asce = gmap->asce;
      ^
   arch/s390/mm/gmap.c:106:3: note: each undeclared identifier is reported only once for each function it appears in
   arch/s390/mm/gmap.c: In function 'gmap_free':
   arch/s390/mm/gmap.c:183:16: warning: unused variable 'gmap_asce' [-Wunused-variable]
     unsigned long gmap_asce;
                   ^
   arch/s390/mm/gmap.c: In function 'gmap_remove':
   arch/s390/mm/gmap.c:254:3: error: 'gmap_asce' undeclared (first use in this function)
      gmap_asce = 0;
      ^

vim +/gmap_asce +106 arch/s390/mm/gmap.c

    32	static struct gmap *gmap_alloc(unsigned long limit)
    33	{
    34		struct gmap *gmap;
    35		struct page *page;
    36		unsigned long *table;
    37		unsigned long etype, atype;
  > 38		unsigned long gmap_asce;
    39	
    40		if (limit < (1UL << 31)) {
    41			limit = (1UL << 31) - 1;
    42			atype = _ASCE_TYPE_SEGMENT;
    43			etype = _SEGMENT_ENTRY_EMPTY;
    44		} else if (limit < (1UL << 42)) {
    45			limit = (1UL << 42) - 1;
    46			atype = _ASCE_TYPE_REGION3;
    47			etype = _REGION3_ENTRY_EMPTY;
    48		} else if (limit < (1UL << 53)) {
    49			limit = (1UL << 53) - 1;
    50			atype = _ASCE_TYPE_REGION2;
    51			etype = _REGION2_ENTRY_EMPTY;
    52		} else {
    53			limit = -1UL;
    54			atype = _ASCE_TYPE_REGION1;
    55			etype = _REGION1_ENTRY_EMPTY;
    56		}
    57		gmap = kzalloc(sizeof(struct gmap), GFP_KERNEL);
    58		if (!gmap)
    59			goto out;
    60		INIT_LIST_HEAD(&gmap->crst_list);
    61		INIT_LIST_HEAD(&gmap->children);
    62		INIT_LIST_HEAD(&gmap->pt_list);
    63		INIT_RADIX_TREE(&gmap->guest_to_host, GFP_KERNEL);
    64		INIT_RADIX_TREE(&gmap->host_to_guest, GFP_ATOMIC);
    65		INIT_RADIX_TREE(&gmap->host_to_rmap, GFP_ATOMIC);
    66		spin_lock_init(&gmap->guest_table_lock);
    67		spin_lock_init(&gmap->shadow_lock);
    68		atomic_set(&gmap->ref_count, 1);
    69		page = alloc_pages(GFP_KERNEL, 2);
    70		if (!page)
    71			goto out_free;
    72		page->index = 0;
    73		list_add(&page->lru, &gmap->crst_list);
    74		table = (unsigned long *) page_to_phys(page);
    75		crst_table_init(table, etype);
    76		gmap->table = table;
    77		gmap->asce = atype | _ASCE_TABLE_LENGTH |
    78			_ASCE_USER_BITS | __pa(table);
    79		gmap->asce_end = limit;
    80		return gmap;
    81	
    82	out_free:
    83		kfree(gmap);
    84	out:
    85		return NULL;
    86	}
    87	
    88	/**
    89	 * gmap_create - create a guest address space
    90	 * @mm: pointer to the parent mm_struct
    91	 * @limit: maximum size of the gmap address space
    92	 *
    93	 * Returns a guest address space structure.
    94	 */
    95	struct gmap *gmap_create(struct mm_struct *mm, unsigned long limit)
    96	{
    97		struct gmap *gmap;
    98	
    99		gmap = gmap_alloc(limit);
   100		if (!gmap)
   101			return NULL;
   102		gmap->mm = mm;
   103		spin_lock(&mm->context.gmap_lock);
   104		list_add_rcu(&gmap->list, &mm->context.gmap_list);
   105		if (list_is_singular(&mm->context.gmap_list))
 > 106			gmap_asce = gmap->asce;
   107		else
   108			gmap_asce = -1UL;
   109		WRITE_ONCE(mm->context.gmap_asce, gmap_asce);

---
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