PM_PSHIFT_BITS 511 fs/proc/task_mmu.c #define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS) PM_PSHIFT_BITS 512 fs/proc/task_mmu.c #define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET)