Merge branch 'linus' into core/locking

13 files changed, 137 insertions, 267 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index ab8553658af3..f3e5f8944d17 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2029,48 +2029,8 @@ int pagecache_write_begin(struct file *file, struct address_space *mapping,
 {
 	const struct address_space_operations *aops = mapping->a_ops;
 
-	if (aops->write_begin) {
-		return aops->write_begin(file, mapping, pos, len, flags,
+	return aops->write_begin(file, mapping, pos, len, flags,
 							pagep, fsdata);
-	} else {
-		int ret;
-		pgoff_t index = pos >> PAGE_CACHE_SHIFT;
-		unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
-		struct inode *inode = mapping->host;
-		struct page *page;
-again:
-		page = __grab_cache_page(mapping, index);
-		*pagep = page;
-		if (!page)
-			return -ENOMEM;
-
-		if (flags & AOP_FLAG_UNINTERRUPTIBLE && !PageUptodate(page)) {
-			/*
-			 * There is no way to resolve a short write situation
-			 * for a !Uptodate page (except by double copying in
-			 * the caller done by generic_perform_write_2copy).
-			 *
-			 * Instead, we have to bring it uptodate here.
-			 */
-			ret = aops->readpage(file, page);
-			page_cache_release(page);
-			if (ret) {
-				if (ret == AOP_TRUNCATED_PAGE)
-					goto again;
-				return ret;
-			}
-			goto again;
-		}
-
-		ret = aops->prepare_write(file, page, offset, offset+len);
-		if (ret) {
-			unlock_page(page);
-			page_cache_release(page);
-			if (pos + len > inode->i_size)
-				vmtruncate(inode, inode->i_size);
-		}
-		return ret;
-	}
 }
 EXPORT_SYMBOL(pagecache_write_begin);
 
@@ -2079,32 +2039,9 @@ int pagecache_write_end(struct file *file, struct address_space *mapping,
 				struct page *page, void *fsdata)
 {
 	const struct address_space_operations *aops = mapping->a_ops;
-	int ret;
-
-	if (aops->write_end) {
-		mark_page_accessed(page);
-		ret = aops->write_end(file, mapping, pos, len, copied,
-							page, fsdata);
-	} else {
-		unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
-		struct inode *inode = mapping->host;
-
-		flush_dcache_page(page);
-		ret = aops->commit_write(file, page, offset, offset+len);
-		unlock_page(page);
-		mark_page_accessed(page);
-		page_cache_release(page);
-
-		if (ret < 0) {
-			if (pos + len > inode->i_size)
-				vmtruncate(inode, inode->i_size);
-		} else if (ret > 0)
-			ret = min_t(size_t, copied, ret);
-		else
-			ret = copied;
-	}
 
-	return ret;
+	mark_page_accessed(page);
+	return aops->write_end(file, mapping, pos, len, copied, page, fsdata);
 }
 EXPORT_SYMBOL(pagecache_write_end);
 
@@ -2226,174 +2163,6 @@ repeat:
 }
 EXPORT_SYMBOL(__grab_cache_page);
 
-static ssize_t generic_perform_write_2copy(struct file *file,
-				struct iov_iter *i, loff_t pos)
-{
-	struct address_space *mapping = file->f_mapping;
-	const struct address_space_operations *a_ops = mapping->a_ops;
-	struct inode *inode = mapping->host;
-	long status = 0;
-	ssize_t written = 0;
-
-	do {
-		struct page *src_page;
-		struct page *page;
-		pgoff_t index;		/* Pagecache index for current page */
-		unsigned long offset;	/* Offset into pagecache page */
-		unsigned long bytes;	/* Bytes to write to page */
-		size_t copied;		/* Bytes copied from user */
-
-		offset = (pos & (PAGE_CACHE_SIZE - 1));
-		index = pos >> PAGE_CACHE_SHIFT;
-		bytes = min_t(unsigned long, PAGE_CACHE_SIZE - offset,
-						iov_iter_count(i));
-
-		/*
-		 * a non-NULL src_page indicates that we're doing the
-		 * copy via get_user_pages and kmap.
-		 */
-		src_page = NULL;
-
-		/*
-		 * Bring in the user page that we will copy from _first_.
-		 * Otherwise there's a nasty deadlock on copying from the
-		 * same page as we're writing to, without it being marked
-		 * up-to-date.
-		 *
-		 * Not only is this an optimisation, but it is also required
-		 * to check that the address is actually valid, when atomic
-		 * usercopies are used, below.
-		 */
-		if (unlikely(iov_iter_fault_in_readable(i, bytes))) {
-			status = -EFAULT;
-			break;
-		}
-
-		page = __grab_cache_page(mapping, index);
-		if (!page) {
-			status = -ENOMEM;
-			break;
-		}
-
-		/*
-		 * non-uptodate pages cannot cope with short copies, and we
-		 * cannot take a pagefault with the destination page locked.
-		 * So pin the source page to copy it.
-		 */
-		if (!PageUptodate(page) && !segment_eq(get_fs(), KERNEL_DS)) {
-			unlock_page(page);
-
-			src_page = alloc_page(GFP_KERNEL);
-			if (!src_page) {
-				page_cache_release(page);
-				status = -ENOMEM;
-				break;
-			}
-
-			/*
-			 * Cannot get_user_pages with a page locked for the
-			 * same reason as we can't take a page fault with a
-			 * page locked (as explained below).
-			 */
-			copied = iov_iter_copy_from_user(src_page, i,
-								offset, bytes);
-			if (unlikely(copied == 0)) {
-				status = -EFAULT;
-				page_cache_release(page);
-				page_cache_release(src_page);
-				break;
-			}
-			bytes = copied;
-
-			lock_page(page);
-			/*
-			 * Can't handle the page going uptodate here, because
-			 * that means we would use non-atomic usercopies, which
-			 * zero out the tail of the page, which can cause
-			 * zeroes to become transiently visible. We could just
-			 * use a non-zeroing copy, but the APIs aren't too
-			 * consistent.
-			 */
-			if (unlikely(!page->mapping || PageUptodate(page))) {
-				unlock_page(page);
-				page_cache_release(page);
-				page_cache_release(src_page);
-				continue;
-			}
-		}
-
-		status = a_ops->prepare_write(file, page, offset, offset+bytes);
-		if (unlikely(status))
-			goto fs_write_aop_error;
-
-		if (!src_page) {
-			/*
-			 * Must not enter the pagefault handler here, because
-			 * we hold the page lock, so we might recursively
-			 * deadlock on the same lock, or get an ABBA deadlock
-			 * against a different lock, or against the mmap_sem
-			 * (which nests outside the page lock).  So increment
-			 * preempt count, and use _atomic usercopies.
-			 *
-			 * The page is uptodate so we are OK to encounter a
-			 * short copy: if unmodified parts of the page are
-			 * marked dirty and written out to disk, it doesn't
-			 * really matter.
-			 */
-			pagefault_disable();
-			copied = iov_iter_copy_from_user_atomic(page, i,
-								offset, bytes);
-			pagefault_enable();
-		} else {
-			void *src, *dst;
-			src = kmap_atomic(src_page, KM_USER0);
-			dst = kmap_atomic(page, KM_USER1);
-			memcpy(dst + offset, src + offset, bytes);
-			kunmap_atomic(dst, KM_USER1);
-			kunmap_atomic(src, KM_USER0);
-			copied = bytes;
-		}
-		flush_dcache_page(page);
-
-		status = a_ops->commit_write(file, page, offset, offset+bytes);
-		if (unlikely(status < 0))
-			goto fs_write_aop_error;
-		if (unlikely(status > 0)) /* filesystem did partial write */
-			copied = min_t(size_t, copied, status);
-
-		unlock_page(page);
-		mark_page_accessed(page);
-		page_cache_release(page);
-		if (src_page)
-			page_cache_release(src_page);
-
-		iov_iter_advance(i, copied);
-		pos += copied;
-		written += copied;
-
-		balance_dirty_pages_ratelimited(mapping);
-		cond_resched();
-		continue;
-
-fs_write_aop_error:
-		unlock_page(page);
-		page_cache_release(page);
-		if (src_page)
-			page_cache_release(src_page);
-
-		/*
-		 * prepare_write() may have instantiated a few blocks
-		 * outside i_size.  Trim these off again. Don't need
-		 * i_size_read because we hold i_mutex.
-		 */
-		if (pos + bytes > inode->i_size)
-			vmtruncate(inode, inode->i_size);
-		break;
-	} while (iov_iter_count(i));
-
-	return written ? written : status;
-}
-
 static ssize_t generic_perform_write(struct file *file,
 				struct iov_iter *i, loff_t pos)
 {
@@ -2494,10 +2263,7 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
 	struct iov_iter i;
 
 	iov_iter_init(&i, iov, nr_segs, count, written);
-	if (a_ops->write_begin)
-		status = generic_perform_write(file, &i, pos);
-	else
-		status = generic_perform_write_2copy(file, &i, pos);
+	status = generic_perform_write(file, &i, pos);
 
 	if (likely(status >= 0)) {
 		written += status;
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 421aee99b84a..d143ab67be44 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -354,11 +354,26 @@ static int vma_has_reserves(struct vm_area_struct *vma)
 	return 0;
 }
 
+static void clear_gigantic_page(struct page *page,
+			unsigned long addr, unsigned long sz)
+{
+	int i;
+	struct page *p = page;
+
+	might_sleep();
+	for (i = 0; i < sz/PAGE_SIZE; i++, p = mem_map_next(p, page, i)) {
+		cond_resched();
+		clear_user_highpage(p, addr + i * PAGE_SIZE);
+	}
+}
 static void clear_huge_page(struct page *page,
 			unsigned long addr, unsigned long sz)
 {
 	int i;
 
+	if (unlikely(sz > MAX_ORDER_NR_PAGES))
+		return clear_gigantic_page(page, addr, sz);
+
 	might_sleep();
 	for (i = 0; i < sz/PAGE_SIZE; i++) {
 		cond_resched();
@@ -366,12 +381,32 @@ static void clear_huge_page(struct page *page,
 	}
 }
 
+static void copy_gigantic_page(struct page *dst, struct page *src,
+			   unsigned long addr, struct vm_area_struct *vma)
+{
+	int i;
+	struct hstate *h = hstate_vma(vma);
+	struct page *dst_base = dst;
+	struct page *src_base = src;
+	might_sleep();
+	for (i = 0; i < pages_per_huge_page(h); ) {
+		cond_resched();
+		copy_user_highpage(dst, src, addr + i*PAGE_SIZE, vma);
+
+		i++;
+		dst = mem_map_next(dst, dst_base, i);
+		src = mem_map_next(src, src_base, i);
+	}
+}
 static void copy_huge_page(struct page *dst, struct page *src,
 			   unsigned long addr, struct vm_area_struct *vma)
 {
 	int i;
 	struct hstate *h = hstate_vma(vma);
 
+	if (unlikely(pages_per_huge_page(h) > MAX_ORDER_NR_PAGES))
+		return copy_gigantic_page(dst, src, addr, vma);
+
 	might_sleep();
 	for (i = 0; i < pages_per_huge_page(h); i++) {
 		cond_resched();
@@ -456,6 +491,8 @@ static void update_and_free_page(struct hstate *h, struct page *page)
 {
 	int i;
 
+	VM_BUG_ON(h->order >= MAX_ORDER);
+
 	h->nr_huge_pages--;
 	h->nr_huge_pages_node[page_to_nid(page)]--;
 	for (i = 0; i < pages_per_huge_page(h); i++) {
@@ -970,6 +1007,14 @@ found:
 	return 1;
 }
 
+static void prep_compound_huge_page(struct page *page, int order)
+{
+	if (unlikely(order > (MAX_ORDER - 1)))
+		prep_compound_gigantic_page(page, order);
+	else
+		prep_compound_page(page, order);
+}
+
 /* Put bootmem huge pages into the standard lists after mem_map is up */
 static void __init gather_bootmem_prealloc(void)
 {
@@ -980,7 +1025,7 @@ static void __init gather_bootmem_prealloc(void)
 		struct hstate *h = m->hstate;
 		__ClearPageReserved(page);
 		WARN_ON(page_count(page) != 1);
-		prep_compound_page(page, h->order);
+		prep_compound_huge_page(page, h->order);
 		prep_new_huge_page(h, page, page_to_nid(page));
 	}
 }
@@ -2130,7 +2175,7 @@ same_page:
 			if (zeropage_ok)
 				pages[i] = ZERO_PAGE(0);
 			else
-				pages[i] = page + pfn_offset;
+				pages[i] = mem_map_offset(page, pfn_offset);
 			get_page(pages[i]);
 		}
 
diff --git a/mm/internal.h b/mm/internal.h
index e4e728bdf324..13333bc2eb68 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -17,6 +17,7 @@ void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
 		unsigned long floor, unsigned long ceiling);
 
 extern void prep_compound_page(struct page *page, unsigned long order);
+extern void prep_compound_gigantic_page(struct page *page, unsigned long order);
 
 static inline void set_page_count(struct page *page, int v)
 {
@@ -176,6 +177,34 @@ static inline void free_page_mlock(struct page *page) { }
 #endif /* CONFIG_UNEVICTABLE_LRU */
 
 /*
+ * Return the mem_map entry representing the 'offset' subpage within
+ * the maximally aligned gigantic page 'base'.  Handle any discontiguity
+ * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
+ */
+static inline struct page *mem_map_offset(struct page *base, int offset)
+{
+	if (unlikely(offset >= MAX_ORDER_NR_PAGES))
+		return pfn_to_page(page_to_pfn(base) + offset);
+	return base + offset;
+}
+
+/*
+ * Iterator over all subpages withing the maximally aligned gigantic
+ * page 'base'.  Handle any discontiguity in the mem_map.
+ */
+static inline struct page *mem_map_next(struct page *iter,
+						struct page *base, int offset)
+{
+	if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
+		unsigned long pfn = page_to_pfn(base) + offset;
+		if (!pfn_valid(pfn))
+			return NULL;
+		return pfn_to_page(pfn);
+	}
+	return iter + 1;
+}
+
+/*
  * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
  * so all functions starting at paging_init should be marked __init
  * in those cases. SPARSEMEM, however, allows for memory hotplug,
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 36f42573a335..e9493b1c1117 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -489,12 +489,6 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
 	int err;
 	struct vm_area_struct *first, *vma, *prev;
 
-	if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) {
-
-		err = migrate_prep();
-		if (err)
-			return ERR_PTR(err);
-	}
 
 	first = find_vma(mm, start);
 	if (!first)
@@ -809,9 +803,13 @@ int do_migrate_pages(struct mm_struct *mm,
 	const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags)
 {
 	int busy = 0;
-	int err = 0;
+	int err;
 	nodemask_t tmp;
 
+	err = migrate_prep();
+	if (err)
+		return err;
+
 	down_read(&mm->mmap_sem);
 
 	err = migrate_vmas(mm, from_nodes, to_nodes, flags);
@@ -974,6 +972,12 @@ static long do_mbind(unsigned long start, unsigned long len,
 		 start, start + len, mode, mode_flags,
 		 nmask ? nodes_addr(*nmask)[0] : -1);
 
+	if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) {
+
+		err = migrate_prep();
+		if (err)
+			return err;
+	}
 	down_write(&mm->mmap_sem);
 	vma = check_range(mm, start, end, nmask,
 			  flags | MPOL_MF_INVERT, &pagelist);
diff --git a/mm/migrate.c b/mm/migrate.c
index 6602941bfab0..385db89f0c33 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -841,12 +841,12 @@ static int do_move_page_to_node_array(struct mm_struct *mm,
 	struct page_to_node *pp;
 	LIST_HEAD(pagelist);
 
+	migrate_prep();
 	down_read(&mm->mmap_sem);
 
 	/*
 	 * Build a list of pages to migrate
 	 */
-	migrate_prep();
 	for (pp = pm; pp->node != MAX_NUMNODES; pp++) {
 		struct vm_area_struct *vma;
 		struct page *page;
diff --git a/mm/mmap.c b/mm/mmap.c
index 74f4d158022e..de14ac21e5b5 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -175,7 +175,8 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
 
 	/* Don't let a single process grow too big:
 	   leave 3% of the size of this process for other processes */
-	allowed -= mm->total_vm / 32;
+	if (mm)
+		allowed -= mm->total_vm / 32;
 
 	/*
 	 * cast `allowed' as a signed long because vm_committed_space
diff --git a/mm/nommu.c b/mm/nommu.c
index 2696b24f2bb3..7695dc850785 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1454,7 +1454,8 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
 
 	/* Don't let a single process grow too big:
 	   leave 3% of the size of this process for other processes */
-	allowed -= current->mm->total_vm / 32;
+	if (mm)
+		allowed -= mm->total_vm / 32;
 
 	/*
 	 * cast `allowed' as a signed long because vm_committed_space
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 64e5b4bcd964..a0a01902f551 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -38,7 +38,6 @@ static DEFINE_SPINLOCK(zone_scan_mutex);
  * badness - calculate a numeric value for how bad this task has been
  * @p: task struct of which task we should calculate
  * @uptime: current uptime in seconds
- * @mem: target memory controller
  *
  * The formula used is relatively simple and documented inline in the
  * function. The main rationale is that we want to select a good task
@@ -295,6 +294,8 @@ static void dump_tasks(const struct mem_cgroup *mem)
 			continue;
 		if (mem && !task_in_mem_cgroup(p, mem))
 			continue;
+		if (!thread_group_leader(p))
+			continue;
 
 		task_lock(p);
 		printk(KERN_INFO "[%5d] %5d %5d %8lu %8lu %3d     %3d %s\n",
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d0a240fbb8bf..54069e64e3a8 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -263,24 +263,39 @@ void prep_compound_page(struct page *page, unsigned long order)
 {
 	int i;
 	int nr_pages = 1 << order;
+
+	set_compound_page_dtor(page, free_compound_page);
+	set_compound_order(page, order);
+	__SetPageHead(page);
+	for (i = 1; i < nr_pages; i++) {
+		struct page *p = page + i;
+
+		__SetPageTail(p);
+		p->first_page = page;
+	}
+}
+
+#ifdef CONFIG_HUGETLBFS
+void prep_compound_gigantic_page(struct page *page, unsigned long order)
+{
+	int i;
+	int nr_pages = 1 << order;
 	struct page *p = page + 1;
 
 	set_compound_page_dtor(page, free_compound_page);
 	set_compound_order(page, order);
 	__SetPageHead(page);
-	for (i = 1; i < nr_pages; i++, p++) {
-		if (unlikely((i & (MAX_ORDER_NR_PAGES - 1)) == 0))
-			p = pfn_to_page(page_to_pfn(page) + i);
+	for (i = 1; i < nr_pages; i++, p = mem_map_next(p, page, i)) {
 		__SetPageTail(p);
 		p->first_page = page;
 	}
 }
+#endif
 
 static void destroy_compound_page(struct page *page, unsigned long order)
 {
 	int i;
 	int nr_pages = 1 << order;
-	struct page *p = page + 1;
 
 	if (unlikely(compound_order(page) != order))
 		bad_page(page);
@@ -288,9 +303,8 @@ static void destroy_compound_page(struct page *page, unsigned long order)
 	if (unlikely(!PageHead(page)))
 			bad_page(page);
 	__ClearPageHead(page);
-	for (i = 1; i < nr_pages; i++, p++) {
-		if (unlikely((i & (MAX_ORDER_NR_PAGES - 1)) == 0))
-			p = pfn_to_page(page_to_pfn(page) + i);
+	for (i = 1; i < nr_pages; i++) {
+		struct page *p = page + i;
 
 		if (unlikely(!PageTail(p) |
 				(p->first_page != page)))
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index b70a7fec1ff6..5e0ffd967452 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -130,10 +130,11 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn)
 		if (page && get_pageblock_migratetype(page) != MIGRATE_ISOLATE)
 			break;
 	}
-	if (pfn < end_pfn)
+	page = __first_valid_page(start_pfn, end_pfn - start_pfn);
+	if ((pfn < end_pfn) || !page)
 		return -EBUSY;
 	/* Check all pages are free or Marked as ISOLATED */
-	zone = page_zone(pfn_to_page(pfn));
+	zone = page_zone(page);
 	spin_lock_irqsave(&zone->lock, flags);
 	ret = __test_page_isolated_in_pageblock(start_pfn, end_pfn);
 	spin_unlock_irqrestore(&zone->lock, flags);
diff --git a/mm/shmem.c b/mm/shmem.c
index d38d7e61fcd0..0ed075215e5f 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -161,8 +161,8 @@ static inline struct shmem_sb_info *SHMEM_SB(struct super_block *sb)
  */
 static inline int shmem_acct_size(unsigned long flags, loff_t size)
 {
-	return (flags & VM_ACCOUNT)?
-		security_vm_enough_memory(VM_ACCT(size)): 0;
+	return (flags & VM_ACCOUNT) ?
+		security_vm_enough_memory_kern(VM_ACCT(size)) : 0;
 }
 
 static inline void shmem_unacct_size(unsigned long flags, loff_t size)
@@ -179,8 +179,8 @@ static inline void shmem_unacct_size(unsigned long flags, loff_t size)
  */
 static inline int shmem_acct_block(unsigned long flags)
 {
-	return (flags & VM_ACCOUNT)?
-		0: security_vm_enough_memory(VM_ACCT(PAGE_CACHE_SIZE));
+	return (flags & VM_ACCOUNT) ?
+		0 : security_vm_enough_memory_kern(VM_ACCT(PAGE_CACHE_SIZE));
 }
 
 static inline void shmem_unacct_blocks(unsigned long flags, long pages)
diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index a91b5f8fcaf6..a13ea6401ae7 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -64,7 +64,7 @@ void __meminit vmemmap_verify(pte_t *pte, int node,
 	unsigned long pfn = pte_pfn(*pte);
 	int actual_node = early_pfn_to_nid(pfn);
 
-	if (actual_node != node)
+	if (node_distance(actual_node, node) > LOCAL_DISTANCE)
 		printk(KERN_WARNING "[%lx-%lx] potential offnode "
 			"page_structs\n", start, end - 1);
 }
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 036536945dd9..ba6b0f5f7fac 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -178,7 +178,7 @@ static int vmap_page_range(unsigned long addr, unsigned long end,
 static inline int is_vmalloc_or_module_addr(const void *x)
 {
 	/*
-	 * x86-64 and sparc64 put modules in a special place,
+	 * ARM, x86-64 and sparc64 put modules in a special place,
 	 * and fall back on vmalloc() if that fails. Others
 	 * just put it in the vmalloc space.
 	 */
@@ -592,6 +592,8 @@ static void free_unmap_vmap_area_addr(unsigned long addr)
 
 #define VMAP_BLOCK_SIZE		(VMAP_BBMAP_BITS * PAGE_SIZE)
 
+static bool vmap_initialized __read_mostly = false;
+
 struct vmap_block_queue {
 	spinlock_t lock;
 	struct list_head free;
@@ -828,6 +830,9 @@ void vm_unmap_aliases(void)
 	int cpu;
 	int flush = 0;
 
+	if (unlikely(!vmap_initialized))
+		return;
+
 	for_each_possible_cpu(cpu) {
 		struct vmap_block_queue *vbq = &per_cpu(vmap_block_queue, cpu);
 		struct vmap_block *vb;
@@ -897,7 +902,8 @@ EXPORT_SYMBOL(vm_unmap_ram);
  * @count: number of pages
  * @node: prefer to allocate data structures on this node
  * @prot: memory protection to use. PAGE_KERNEL for regular RAM
- * @returns: a pointer to the address that has been mapped, or NULL on failure
+ *
+ * Returns: a pointer to the address that has been mapped, or %NULL on failure
  */
 void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t prot)
 {
@@ -941,6 +947,8 @@ void __init vmalloc_init(void)
 		INIT_LIST_HEAD(&vbq->dirty);
 		vbq->nr_dirty = 0;
 	}
+
+	vmap_initialized = true;
 }
 
 void unmap_kernel_range(unsigned long addr, unsigned long size)