hulk inclusion
category: bugfix
bugzilla: 186971, https://gitee.com/openeuler/kernel/issues/I5C8IW
CVE: NA

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refcount_t type and corresponding API can protect refcounters from
accidental underflow and overflow and further use-after-free situations.
Signed-off-by: NXiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: NXin Tan <tanxin.ctf@gmail.com>
Reviewed-by: NJan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/1626674355-55795-1-git-send-email-xiyuyang19@fudan.edu.cnSigned-off-by: NTheodore Ts'o <tytso@mit.edu>
Signed-off-by: NLi Nan <linan122@huawei.com>
Reviewed-by: NZhang Yi <yi.zhang@huawei.com>
Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>