linux-kernel - [PATCH] mm: mmap: Use helper function allow_write_access() in __remove_shared_vm

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Message-ID: <20200913092838.27724-1-linmiaohe@huawei.com>
Date:   Sun, 13 Sep 2020 05:28:38 -0400
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH] mm: mmap: Use helper function allow_write_access() in __remove_shared_vm_struct()

Use helper function allow_write_access() to atomic_inc the i_writecount.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/mmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 80ea11bf12fa..a22f1a2fc82e 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -143,7 +143,7 @@ static void __remove_shared_vm_struct(struct vm_area_struct *vma,
 		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);
 
-- 
2.19.1