From: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Subject: mm/mmap.c: use helper function allow_write_access() in __remove_shared_vm_struct()
In commit 1da177e4c3f4 ("Linux-2.6.12-rc2"), the helper allow_write_access
came with the atomic_inc operation of the i_writecount field in the func
__remove_shared_vm_struct(). But it forgot to use this helper function.
Link: https://lkml.kernel.org/r/20200921115814.39680-1-linmiaohe@xxxxxxxxxx
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/mmap.c~mm-mmap-use-helper-function-allow_write_access-in-__remove_shared_vm_struct
+++ a/mm/mmap.c
@@ -143,7 +143,7 @@ static void __remove_shared_vm_struct(st
struct file *file, struct address_space *mapping)
{
if (vma->vm_flags & VM_DENYWRITE)
- atomic_inc(&file_inode(file)->i_writecount);
+ allow_write_access(file);
if (vma->vm_flags & VM_SHARED)
mapping_unmap_writable(mapping);
_
