PID_BITS 22 arch/nios2/mm/mmu_context.c #define PID_MASK ((1UL << PID_BITS) - 1) PID_BITS 25 arch/nios2/mm/mmu_context.c #define VERSION_BITS (32 - PID_BITS) PID_BITS 26 arch/nios2/mm/mmu_context.c #define VERSION_SHIFT (PID_SHIFT + PID_BITS)