reg21 247 arch/mips/include/asm/processor.h unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23; reg21 319 arch/mips/include/asm/processor.h .reg21 = 0, \ reg21 118 arch/mips/kernel/asm-offsets.c OFFSET(THREAD_REG21, task_struct, thread.reg21); reg21 256 arch/mips/kernel/kgdb.c *(ptr++) = p->thread.reg21;