From 0ef4c774146d07241446d92914232e2db2a5fd19 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Mon, 15 Mar 2021 17:47:37 +0800
Subject: [PATCH] mm/swapfile.c: fix a comment in sys_swapon()

mainline inclusion
from mainline-5.6-rc3
commit fed98ef4d8b665316479dd35cbd92d3e2ff470a3
category: bugfix
bugzilla: 50612
CVE: NA
---------------------------

claim_swapfile now always takes i_rwsem.

Link: http://lkml.kernel.org/r/20200114161225.309792-2-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: zhangyi (F) <yi.zhang@huawei.com>
Reviewed-by: Yang Erkun <yangerkun@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Cheng Jian <cj.chengjian@huawei.com>
---
 mm/swapfile.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index c03de4f1ee77..074a724df169 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -3259,7 +3259,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
 	mapping = swap_file->f_mapping;
 	inode = mapping->host;
 
-	/* If S_ISREG(inode->i_mode) will do inode_lock(inode); */
+	/* will take i_rwsem; */
 	error = claim_swapfile(p, inode);
 	if (unlikely(error))
 		goto bad_swap;
-- 
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