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By the commit in mainline v5.11-rc1,
cd539cff9470f 2020-11-02 lockdep: Provide dummy forward declaration of
	*_is_held() helpers
aufs has to introduce a workaround in case of !LOCKDEP to call
*_is_held() helpers.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>