MMF_DUMPABLE_BITS   15 include/linux/sched/coredump.h #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
MMF_DUMPABLE_BITS   45 include/linux/sched/coredump.h #define MMF_DUMP_FILTER_SHIFT	MMF_DUMPABLE_BITS