s390/bpf: reduce maximum program size to 64 KB

[karo-tx-linux.git] / arch / s390 / net / bpf_jit_comp.c

diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index 9a0c4c22e53670b1d813f3ddfb328b76c8e06c78..0e2919dd8df368d8362570e138771139a9073b17 100644 (file)
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -45,7 +45,7 @@ struct bpf_jit {
        int labels[1];          /* Labels for local jumps */
 };
 
-#define BPF_SIZE_MAX   0x7ffff /* Max size for program (20 bit signed displ) */
+#define BPF_SIZE_MAX   0xffff  /* Max size for program (16 bit branches) */
 
 #define SEEN_SKB       1       /* skb access */
 #define SEEN_MEM       2       /* use mem[] for temporary storage */
@@ -446,7 +446,7 @@ static void bpf_jit_prologue(struct bpf_jit *jit, bool is_classic)
                emit_load_skb_data_hlen(jit);
        if (jit->seen & SEEN_SKB_CHANGE)
                /* stg %b1,ST_OFF_SKBP(%r0,%r15) */
-               EMIT6_DISP_LH(0xe3000000, 0x0024, REG_W1, REG_0, REG_15,
+               EMIT6_DISP_LH(0xe3000000, 0x0024, BPF_REG_1, REG_0, REG_15,
                              STK_OFF_SKBP);
        /* Clear A (%b0) and X (%b7) registers for converted BPF programs */
        if (is_classic) {