bpf: do not use reciprocal divide

[~andy/linux] / arch / powerpc / net / bpf_jit_comp.c

diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
index ac3c2a10dafda9e73145dabfbc7181548f288fd5..555034f8505e8d1d83bfeef3480a9bc058499754 100644 (file)
--- a/arch/powerpc/net/bpf_jit_comp.c
+++ b/arch/powerpc/net/bpf_jit_comp.c
@@ -223,10 +223,11 @@ static int bpf_jit_build_body(struct sk_filter *fp, u32 *image,
                        }
                        PPC_DIVWU(r_A, r_A, r_X);
                        break;
-               case BPF_S_ALU_DIV_K: /* A = reciprocal_divide(A, K); */
+               case BPF_S_ALU_DIV_K: /* A /= K */
+                       if (K == 1)
+                               break;
                        PPC_LI32(r_scratch1, K);
-                       /* Top 32 bits of 64bit result -> A */
-                       PPC_MULHWU(r_A, r_A, r_scratch1);
+                       PPC_DIVWU(r_A, r_A, r_scratch1);
                        break;
                case BPF_S_ALU_AND_X:
                        ctx->seen |= SEEN_XREG;