Revert "kernfs: remove KERNFS_REMOVED"

This reverts commit ae34372eb8408b3d07e870f1939f99007a730d28.

Tejun writes:
        I'm sorry but can you please revert the whole series?
        get_active() waiting while a node is deactivated has potential
        to lead to deadlock and that deactivate/reactivate interface is
        something fundamentally flawed and that cgroup will have to work
        with the remove_self() like everybody else.  IOW, I think the
        first posting was correct.

Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/fs/kernfs/kernfs-internal.h b/fs/kernfs/kernfs-internal.h
index 57a93f4..c6ba5bc 100644
--- a/fs/kernfs/kernfs-internal.h
+++ b/fs/kernfs/kernfs-internal.h
@@ -26,8 +26,7 @@
 	struct simple_xattrs	xattrs;
 };
 
-/* +1 to avoid triggering overflow warning when negating it */
-#define KN_DEACTIVATED_BIAS		(INT_MIN + 1)
+#define KN_DEACTIVATED_BIAS		INT_MIN
 
 /* KERNFS_TYPE_MASK and types are defined in include/linux/kernfs.h */