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This reverts commit 93ec4dd2.

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

Aufs has an internal debugging feature which uses LOCKDEP.
Without LOCKDEP, aufs cannot get the correct lock status.  As a
result, BUG_ON() was called unexpectedly.
In other words, with the configuration of CONFIG_AUFS_DEBUG enabled
and CONFIG_LOCKDEP disabled, a bug appears.
Reported-by: "Zhengyuan Liu" <liuzhengyuan@g.ycsipg.com>
See-also: https://www.mail-archive.com/aufs-users@lists.sourceforge.net/msg05829.html

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

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>

This reverts commit 7ab47e64.

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>