[PATCH] fork: Use helper function mapping_allow_writable() in dup_mmap()

[Miaohe Lin]

Use helper function mapping_allow_writable() to atomic_inc i_mmap_writable.

Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
---
 kernel/fork.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index 4b328aecabb2..a0586716e327 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -558,7 +558,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
 				atomic_dec(&inode->i_writecount);
 			i_mmap_lock_write(mapping);
 			if (tmp->vm_flags & VM_SHARED)
-				atomic_inc(&mapping->i_mmap_writable);
+				mapping_allow_writable(mapping);
 			flush_dcache_mmap_lock(mapping);
 			/* insert tmp into the share list, just after mpnt */
 			vma_interval_tree_insert_after(tmp, mpnt,
-- 
2.19.1