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vfs, freeze: use ACCESS_ONCE() to guard access to ->mnt_flags
authorMiao Xie <miaox@cn.fujitsu.com>
Fri, 16 Nov 2012 09:23:50 +0000 (17:23 +0800)
committerAl Viro <viro@zeniv.linux.org.uk>
Thu, 20 Dec 2012 18:36:18 +0000 (13:36 -0500)
The compiler may optimize the while loop and make the check just be done once,
so we should use ACCESS_ONCE() to guard access to ->mnt_flags

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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