[PATCH v2 09/10] powerpc/bpf ppc32: Do not emit zero extend instruction for 64-bit BPF_END

[Christophe Leroy]

Le 05/10/2021 à 22:25, Naveen N. Rao a écrit :
> Suppress emitting zero extend instruction for 64-bit BPF_END_FROM_[L|B]E
> operation.
> 
> Fixes: 51c66ad849a703 ("powerpc/bpf: Implement extended BPF on PPC32")
> Signed-off-by: Naveen N. Rao <naveen.n.rao at linux.vnet.ibm.com>

Reviewed-by: Christophe Leroy <christophe.leroy at csgroup.eu>

> ---
>   arch/powerpc/net/bpf_jit_comp32.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/net/bpf_jit_comp32.c b/arch/powerpc/net/bpf_jit_comp32.c
> index 7c65de9ed4fa64..68dc8a8231de04 100644
> --- a/arch/powerpc/net/bpf_jit_comp32.c
> +++ b/arch/powerpc/net/bpf_jit_comp32.c
> @@ -1107,7 +1107,7 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
>   			return -EOPNOTSUPP;
>   		}
>   		if (BPF_CLASS(code) == BPF_ALU && !fp->aux->verifier_zext &&
> -		    !insn_is_zext(&insn[i + 1]))
> +		    !insn_is_zext(&insn[i + 1]) && !(BPF_OP(code) == BPF_END && imm == 64))
>   			EMIT(PPC_RAW_LI(dst_reg_h, 0));
>   	}
>   
>