diff --git a/mm/internal.h b/mm/internal.h
index e48c486d5ddf..f235aa92e564 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -71,11 +71,6 @@ void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
 		unsigned long floor, unsigned long ceiling);
 void pmd_install(struct mm_struct *mm, pmd_t *pmd, pgtable_t *pte);
 
-static inline bool can_madv_lru_vma(struct vm_area_struct *vma)
-{
-	return !(vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_PFNMAP));
-}
-
 struct zap_details;
 void unmap_page_range(struct mmu_gather *tlb,
 			     struct vm_area_struct *vma,
@@ -398,12 +393,8 @@ extern long populate_vma_page_range(struct vm_area_struct *vma,
 extern long faultin_vma_page_range(struct vm_area_struct *vma,
 				   unsigned long start, unsigned long end,
 				   bool write, int *locked);
-extern void munlock_vma_pages_range(struct vm_area_struct *vma,
-			unsigned long start, unsigned long end);
-static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
-{
-	munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
-}
+extern int mlock_future_check(struct mm_struct *mm, unsigned long flags,
+			      unsigned long len);
 
 /*
  * must be called with vma's mmap_lock held for read or write, and page locked.
@@ -411,9 +402,6 @@ static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
 extern void mlock_vma_page(struct page *page);
 extern void munlock_vma_page(struct page *page);
 
-extern int mlock_future_check(struct mm_struct *mm, unsigned long flags,
-			      unsigned long len);
-
 /*
  * Clear the page's PageMlocked().  This can be useful in a situation where
  * we want to unconditionally remove a page from the pagecache -- e.g.,
diff --git a/mm/madvise.c b/mm/madvise.c
index 5604064df464..ae35d72627ef 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -530,6 +530,11 @@ static void madvise_cold_page_range(struct mmu_gather *tlb,
 	tlb_end_vma(tlb, vma);
 }
 
+static inline bool can_madv_lru_vma(struct vm_area_struct *vma)
+{
+	return !(vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_PFNMAP));
+}
+
 static long madvise_cold(struct vm_area_struct *vma,
 			struct vm_area_struct **prev,
 			unsigned long start_addr, unsigned long end_addr)
diff --git a/mm/mlock.c b/mm/mlock.c
index aec4ce7919da..5d7ced8303be 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -137,8 +137,8 @@ void munlock_vma_page(struct page *page)
  * Returns with VM_LOCKED cleared.  Callers must be prepared to
  * deal with this.
  */
-void munlock_vma_pages_range(struct vm_area_struct *vma,
-			     unsigned long start, unsigned long end)
+static void munlock_vma_pages_range(struct vm_area_struct *vma,
+				    unsigned long start, unsigned long end)
 {
 	vma->vm_flags &= VM_LOCKED_CLEAR_MASK;
 
diff --git a/mm/mmap.c b/mm/mmap.c
index 1e8fdb0b51ed..64b5985b5295 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2674,6 +2674,8 @@ detach_vmas_to_be_unmapped(struct mm_struct *mm, struct vm_area_struct *vma,
 	vma->vm_prev = NULL;
 	do {
 		vma_rb_erase(vma, &mm->mm_rb);
+		if (vma->vm_flags & VM_LOCKED)
+			mm->locked_vm -= vma_pages(vma);
 		mm->map_count--;
 		tail_vma = vma;
 		vma = vma->vm_next;
@@ -2778,22 +2780,6 @@ int split_vma(struct mm_struct *mm, struct vm_area_struct *vma,
 	return __split_vma(mm, vma, addr, new_below);
 }
 
-static inline void
-unlock_range(struct vm_area_struct *start, unsigned long limit)
-{
-	struct mm_struct *mm = start->vm_mm;
-	struct vm_area_struct *tmp = start;
-
-	while (tmp && tmp->vm_start < limit) {
-		if (tmp->vm_flags & VM_LOCKED) {
-			mm->locked_vm -= vma_pages(tmp);
-			munlock_vma_pages_all(tmp);
-		}
-
-		tmp = tmp->vm_next;
-	}
-}
-
 /* Munmap is split into 2 main parts -- this part which finds
  * what needs doing, and the areas themselves, which do the
  * work.  This now handles partial unmappings.
@@ -2874,12 +2860,6 @@ int __do_munmap(struct mm_struct *mm, unsigned long start, size_t len,
 			return error;
 	}
 
-	/*
-	 * unlock any mlock()ed ranges before detaching vmas
-	 */
-	if (mm->locked_vm)
-		unlock_range(vma, end);
-
 	/* Detach vmas from rbtree */
 	if (!detach_vmas_to_be_unmapped(mm, vma, prev, end))
 		downgrade = false;
@@ -3147,20 +3127,12 @@ void exit_mmap(struct mm_struct *mm)
 		 * Nothing can be holding mm->mmap_lock here and the above call
 		 * to mmu_notifier_release(mm) ensures mmu notifier callbacks in
 		 * __oom_reap_task_mm() will not block.
-		 *
-		 * This needs to be done before calling unlock_range(),
-		 * which clears VM_LOCKED, otherwise the oom reaper cannot
-		 * reliably test it.
 		 */
 		(void)__oom_reap_task_mm(mm);
-
 		set_bit(MMF_OOM_SKIP, &mm->flags);
 	}
 
 	mmap_write_lock(mm);
-	if (mm->locked_vm)
-		unlock_range(mm->mmap, ULONG_MAX);
-
 	arch_exit_mmap(mm);
 
 	vma = mm->mmap;
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 832fb330376e..6b875acabd1e 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -526,7 +526,7 @@ bool __oom_reap_task_mm(struct mm_struct *mm)
 	set_bit(MMF_UNSTABLE, &mm->flags);
 
 	for (vma = mm->mmap ; vma; vma = vma->vm_next) {
-		if (!can_madv_lru_vma(vma))
+		if (vma->vm_flags & (VM_HUGETLB|VM_PFNMAP))
 			continue;
 
 		/*