MAX_LOCKDEP_CHAINS_BITS  351 kernel/locking/lockdep.c #define CHAINHASH_BITS		(MAX_LOCKDEP_CHAINS_BITS-1)
MAX_LOCKDEP_CHAINS_BITS  109 kernel/locking/lockdep_internals.h #define MAX_LOCKDEP_CHAINS	(1UL << MAX_LOCKDEP_CHAINS_BITS)