3 files changed, 4 insertions, 3 deletions

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 5f34bd8dda34..a876871f6be5 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2277,8 +2277,8 @@ void __unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
                         set_page_dirty(page);
                 list_add(&page->lru, &page_list);
         }
-        spin_unlock(&mm->page_table_lock);
         flush_tlb_range(vma, start, end);
+        spin_unlock(&mm->page_table_lock);
         mmu_notifier_invalidate_range_end(mm, start, end);
         list_for_each_entry_safe(page, tmp, &page_list, lru) {
                 page_remove_rmap(page);
diff --git a/mm/mmap.c b/mm/mmap.c
index 3f758c7f4c81..22e1a0b2f70c 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1293,6 +1293,8 @@ munmap_back:
                 pgoff = vma->vm_pgoff;
                 vm_flags = vma->vm_flags;
         } else if (vm_flags & VM_SHARED) {
+                if (unlikely(vm_flags & (VM_GROWSDOWN|VM_GROWSUP)))
+                        goto free_vma;
                 error = shmem_zero_setup(vma);
                 if (error)
                         goto free_vma;
diff --git a/mm/percpu-vm.c b/mm/percpu-vm.c
index 12a48a88c0d8..405d331804c3 100644
--- a/mm/percpu-vm.c
+++ b/mm/percpu-vm.c
@@ -184,8 +184,7 @@ static void pcpu_unmap_pages(struct pcpu_chunk *chunk,
                                    page_end - page_start);
         }
 
-        for (i = page_start; i < page_end; i++)
-                __clear_bit(i, populated);
+        bitmap_clear(populated, page_start, page_end - page_start);
 }
 
 /**