netdev - Re: [PATCH bpf-next] bpf: use BPF_CAST

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Date:   Tue, 16 Apr 2019 20:28:20 +0000
From:   Song Liu <songliubraving@...com>
To:     Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin Lau <kafai@...com>, Yonghong Song <yhs@...com>,
        "prashantbhole.linux@...il.com" <prashantbhole.linux@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH bpf-next] bpf: use BPF_CAST_CALL for casting bpf call



> On Apr 16, 2019, at 2:13 AM, Prashant Bhole <bhole_prashant_q7@....ntt.co.jp> wrote:
> 
> verifier.c uses BPF_CAST_CALL for casting bpf call except at one
> place in jit_subprogs(). Let's use the macro for consistency.
> 
> Signed-off-by: Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>

Acked-by: Song Liu <songliubraving@...com>

> ---
> kernel/bpf/verifier.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
> index c7220153c5b1..db301e9b5295 100644
> --- a/kernel/bpf/verifier.c
> +++ b/kernel/bpf/verifier.c
> @@ -7647,9 +7647,8 @@ static int jit_subprogs(struct bpf_verifier_env *env)
> 			    insn->src_reg != BPF_PSEUDO_CALL)
> 				continue;
> 			subprog = insn->off;
> -			insn->imm = (u64 (*)(u64, u64, u64, u64, u64))
> -				func[subprog]->bpf_func -
> -				__bpf_call_base;
> +			insn->imm = BPF_CAST_CALL(func[subprog]->bpf_func) -
> +				    __bpf_call_base;
> 		}
> 
> 		/* we use the aux data to keep a list of the start addresses
> -- 
> 2.17.2
> 
>