PG_compound_lock  387 include/linux/mm.h 	bit_spin_lock(PG_compound_lock, &page->flags);
PG_compound_lock  395 include/linux/mm.h 	bit_spin_unlock(PG_compound_lock, &page->flags);
PG_compound_lock  514 include/linux/page-flags.h #define __PG_COMPOUND_LOCK		(1 << PG_compound_lock)