s390/bpf: Remove unused SEEN_RET0, SEEN_REG_AX and ret0_ip

	int lit_start;		/* Start of literal pool */

	int lit;		/* Current position in literal pool */

	int base_ip;		/* Base address for literal pool */

	int ret0_ip;		/* Address of return 0 */

	int exit_ip;		/* Address of exit */

	int r1_thunk_ip;	/* Address of expoline thunk for 'br %r1' */

	int r14_thunk_ip;	/* Address of expoline thunk for 'br %r14' */

#define BPF_SIZE_MAX	0xffff	/* Max size for program (16 bit branches) */

#define SEEN_MEM	(1 << 0)	/* use mem[] for temporary storage */

#define SEEN_RET0	(1 << 1)	/* ret0_ip points to a valid return 0 */

#define SEEN_LITERAL	(1 << 2)	/* code uses literals */

#define SEEN_FUNC	(1 << 3)	/* calls C functions */

#define SEEN_TAIL_CALL	(1 << 4)	/* code uses tail calls */

#define SEEN_REG_AX	(1 << 5)	/* code uses constant blinding */

#define SEEN_MEM	BIT(0)		/* use mem[] for temporary storage */

#define SEEN_LITERAL	BIT(1)		/* code uses literals */

#define SEEN_FUNC	BIT(2)		/* calls C functions */

#define SEEN_TAIL_CALL	BIT(3)		/* code uses tail calls */

#define SEEN_STACK	(SEEN_FUNC | SEEN_MEM)

/*

 */

static void bpf_jit_epilogue(struct bpf_jit *jit, u32 stack_depth)

{

	/* Return 0 */

	if (jit->seen & SEEN_RET0) {

		jit->ret0_ip = jit->prg;

		/* lghi %b0,0 */

		EMIT4_IMM(0xa7090000, BPF_REG_0, 0);

	}

	jit->exit_ip = jit->prg;

	/* Load exit code: lgr %r2,%b0 */

	EMIT4(0xb9040000, REG_2, BPF_REG_0);

	s16 off = insn->off;

	unsigned int mask;

	if (dst_reg == BPF_REG_AX || src_reg == BPF_REG_AX)

		jit->seen |= SEEN_REG_AX;

	switch (insn->code) {

	/*

	 * BPF_MOV

		break;

	case BPF_JMP | BPF_EXIT: /* return b0 */

		last = (i == fp->len - 1) ? 1 : 0;

		if (last && !(jit->seen & SEEN_RET0))

		if (last)

			break;

		/* j <exit> */

		EMIT4_PCREL(0xa7f40000, jit->exit_ip - jit->prg);