[PATCH] mm: Use helper function mapping_allow_writable()

[Miaohe Lin]

Commit 4bb5f5d9395b ("mm: allow drivers to prevent new writable mappings")
changed i_mmap_writable from unsigned int to atomic_t and add the helper
function mapping_allow_writable() to atomic_inc i_mmap_writable. But it
forgot to use this helper function in dup_mmap() and __vma_link_file().

Signed-off-by: Miaohe Lin <linmia...@huawei.com>
---
 kernel/fork.c | 2 +-
 mm/mmap.c     | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index 11ed5ac35caf..b9164b75b20c 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,
diff --git a/mm/mmap.c b/mm/mmap.c
index e3a1c1b48909..ae9ef433f830 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -665,7 +665,7 @@ static void __vma_link_file(struct vm_area_struct *vma)
                if (vma->vm_flags & VM_DENYWRITE)
                        atomic_dec(&file_inode(file)->i_writecount);
                if (vma->vm_flags & VM_SHARED)
-                       atomic_inc(&mapping->i_mmap_writable);
+                       mapping_allow_writable(mapping);
 
                flush_dcache_mmap_lock(mapping);
                vma_interval_tree_insert(vma, &mapping->i_mmap);
-- 
2.19.1