diff --git a/mm/filemap.c b/mm/filemap.c
index e80189f9129488424fd21267ed7d884cffcb4a35..f578d4e3e2c8681edc2ecaf5835a5f73444094ee 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2530,6 +2530,7 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma,
 				   pgoff_t offset)
 {
 	struct address_space *mapping = file->f_mapping;
+	unsigned int mmap_miss;
 
 	/* If we don't want any read-ahead, don't bother */
 	if (vma->vm_flags & VM_RAND_READ)
@@ -2544,14 +2545,15 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma,
 	}
 
 	/* Avoid banging the cache line if not needed */
-	if (ra->mmap_miss < MMAP_LOTSAMISS * 10)
-		ra->mmap_miss++;
+	mmap_miss = READ_ONCE(ra->mmap_miss);
+	if (mmap_miss < MMAP_LOTSAMISS * 10)
+		WRITE_ONCE(ra->mmap_miss, ++mmap_miss);
 
 	/*
 	 * Do we miss much more than hit in this file? If so,
 	 * stop bothering with read-ahead. It will only hurt.
 	 */
-	if (ra->mmap_miss > MMAP_LOTSAMISS)
+	if (mmap_miss > MMAP_LOTSAMISS)
 		return;
 
 	/*
@@ -2574,12 +2576,14 @@ static void do_async_mmap_readahead(struct vm_area_struct *vma,
 				    pgoff_t offset)
 {
 	struct address_space *mapping = file->f_mapping;
+	unsigned int mmap_miss;
 
 	/* If we don't want any read-ahead, don't bother */
 	if (vma->vm_flags & VM_RAND_READ)
 		return;
-	if (ra->mmap_miss > 0)
-		ra->mmap_miss--;
+	mmap_miss = READ_ONCE(ra->mmap_miss);
+	if (mmap_miss)
+		WRITE_ONCE(ra->mmap_miss, --mmap_miss);
 	if (PageReadahead(page))
 		page_cache_async_readahead(mapping, ra, file,
 					   page, offset, ra->ra_pages);
@@ -2739,6 +2743,7 @@ void filemap_map_pages(struct vm_fault *vmf,
 	pgoff_t last_pgoff = start_pgoff;
 	unsigned long max_idx;
 	struct page *head, *page;
+	unsigned int mmap_miss = READ_ONCE(file->f_ra.mmap_miss);
 
 	rcu_read_lock();
 	radix_tree_for_each_slot(slot, &mapping->i_pages, &iter, start_pgoff) {
@@ -2786,8 +2791,8 @@ void filemap_map_pages(struct vm_fault *vmf,
 		if (page->index >= max_idx)
 			goto unlock;
 
-		if (file->f_ra.mmap_miss > 0)
-			file->f_ra.mmap_miss--;
+		if (mmap_miss > 0)
+			mmap_miss--;
 
 		vmf->address += (iter.index - last_pgoff) << PAGE_SHIFT;
 		if (vmf->pte)
@@ -2809,6 +2814,7 @@ void filemap_map_pages(struct vm_fault *vmf,
 			break;
 	}
 	rcu_read_unlock();
+	WRITE_ONCE(file->f_ra.mmap_miss, mmap_miss);
 }
 EXPORT_SYMBOL(filemap_map_pages);