STACK_OFFSET
#define STACK_OFFSET(k) (-4 - (k) * 4)
#define STACK_OFFSET(k) (- (NR_SAVED_REGISTERS + k + 1))
#define STACK_OFFSET(k) (-4 - (4 * NR_SAVED_REGISTERS) - (4 * (k)))
#define STACK_OFFSET (THREAD_SIZE - TRACEREG_SZ - STACKFRAME_SZ)
#define STACK_OFFSET (THREAD_SIZE - TRACEREG_SZ - STACKFRAME_SZ)
#define STACK_OFFSET (THREAD_SIZE - TRACEREG_SZ - STACKFRAME_SZ)
#define STACK_OFFSET(k) (k)