linux-kernel - [PATCH] fork: Use helper function mapping_allow_writable() in dup

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Date:   Sun, 13 Sep 2020 05:24:15 -0400
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <christian.brauner@...ntu.com>, <akpm@...ux-foundation.org>,
        <peterz@...radead.org>, <mingo@...nel.org>,
        <ebiederm@...ssion.com>, <christian@...lner.me>,
        <surenb@...gle.com>, <areber@...hat.com>, <shakeelb@...gle.com>,
        <cyphar@...har.com>, <tglx@...utronix.de>
CC:     <linux-kernel@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH] fork: Use helper function mapping_allow_writable() in dup_mmap()

Use helper function mapping_allow_writable() to atomic_inc i_mmap_writable.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 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