[PATCH/RFC v2 bpf-next 14/19] powerpc: bpf: eliminate zero extension code-gen

[Jiong Wang]

Cc: Naveen N. Rao <naveen.n....@linux.ibm.com>
Cc: Sandipan Das <sandi...@linux.ibm.com>
Signed-off-by: Jiong Wang <jiong.w...@netronome.com>
---
 arch/powerpc/net/bpf_jit_comp64.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/net/bpf_jit_comp64.c 
b/arch/powerpc/net/bpf_jit_comp64.c
index 21a1dcd..d10621b 100644
--- a/arch/powerpc/net/bpf_jit_comp64.c
+++ b/arch/powerpc/net/bpf_jit_comp64.c
@@ -559,7 +559,7 @@ static int bpf_jit_build_body(struct bpf_prog *fp, u32 
*image,
 
 bpf_alu32_trunc:
                /* Truncate to 32-bits */
-               if (BPF_CLASS(code) == BPF_ALU)
+               if (BPF_CLASS(code) == BPF_ALU && fp->aux->no_verifier_zext)
                        PPC_RLWINM(dst_reg, dst_reg, 0, 0, 31);
                break;
 
@@ -1046,6 +1046,11 @@ struct powerpc64_jit_data {
        struct codegen_context ctx;
 };
 
+bool bpf_jit_hardware_zext(void)
+{
+       return false;
+}
+
 struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)
 {
        u32 proglen;
-- 
2.7.4