X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=arch%2Fpowerpc%2Fnet%2Fbpf_jit_comp.c;h=2d66a8446198dfcf48849c61a561cf7527f79e56;hb=e243129c07be5e2e262989743a4cc94da0e5be2e;hp=04782164ee67d8a570bcb4b4ee166dc6809753de;hpb=4fe5e199ebcd82a05c7446e7e6b85027358dc274;p=firefly-linux-kernel-4.4.55.git

diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
index 04782164ee67..2d66a8446198 100644
--- a/arch/powerpc/net/bpf_jit_comp.c
+++ b/arch/powerpc/net/bpf_jit_comp.c
@@ -78,18 +78,9 @@ static void bpf_jit_build_prologue(struct bpf_prog *fp, u32 *image,
 		PPC_LI(r_X, 0);
 	}
 
-	switch (filter[0].code) {
-	case BPF_RET | BPF_K:
-	case BPF_LD | BPF_W | BPF_LEN:
-	case BPF_LD | BPF_W | BPF_ABS:
-	case BPF_LD | BPF_H | BPF_ABS:
-	case BPF_LD | BPF_B | BPF_ABS:
-		/* first instruction sets A register (or is RET 'constant') */
-		break;
-	default:
-		/* make sure we dont leak kernel information to user */
+	/* make sure we dont leak kernel information to user */
+	if (bpf_needs_clear_a(&filter[0]))
 		PPC_LI(r_A, 0);
-	}
 }
 
 static void bpf_jit_build_epilogue(u32 *image, struct codegen_context *ctx)