linux-kernel - Re: [PATCH v5 2/5] LoongArch: BPF: Update the code to rename validate_code to validate

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Message-ID: <CAEyhmHRzvazN06DsrqTO9PiBj7kJpZ3XdcOpxE2khjaKaE5jZQ@mail.gmail.com>
Date: Thu, 31 Jul 2025 09:44:23 +0800
From: Hengqi Chen <hengqi.chen@...il.com>
To: Chenghao Duan <duanchenghao@...inos.cn>
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org, 
	yangtiezhu@...ngson.cn, chenhuacai@...nel.org, martin.lau@...ux.dev, 
	eddyz87@...il.com, song@...nel.org, yonghong.song@...ux.dev, 
	john.fastabend@...il.com, kpsingh@...nel.org, sdf@...ichev.me, 
	haoluo@...gle.com, jolsa@...nel.org, kernel@...0n.name, 
	linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev, bpf@...r.kernel.org, 
	guodongtai@...inos.cn, youling.tang@...ux.dev, jianghaoran@...inos.cn, 
	vincent.mc.li@...il.com, geliang@...nel.org
Subject: Re: [PATCH v5 2/5] LoongArch: BPF: Update the code to rename
 validate_code to validate_ctx

On Wed, Jul 30, 2025 at 9:13 PM Chenghao Duan <duanchenghao@...inos.cn> wrote:
>
> Rename the existing validate_code() to validate_ctx()
> Factor out the code validation handling into a new helper validate_code()
>
> * validate_code is used to check the validity of code.
> * validate_ctx is used to check both code validity and table entry
>   correctness.
>
> The new validate_code() will be used in subsequent changes.
>

I still feel uncomfortable about the subject line.
Hope Huacai can rephrase it when apply.
other than that,

Reviewed-by: Hengqi Chen <hengqi.chen@...il.com>

> Co-developed-by: George Guo <guodongtai@...inos.cn>
> Signed-off-by: George Guo <guodongtai@...inos.cn>
> Signed-off-by: Chenghao Duan <duanchenghao@...inos.cn>
> ---
>  arch/loongarch/net/bpf_jit.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/arch/loongarch/net/bpf_jit.c b/arch/loongarch/net/bpf_jit.c
> index fa1500d4a..7032f11d3 100644
> --- a/arch/loongarch/net/bpf_jit.c
> +++ b/arch/loongarch/net/bpf_jit.c
> @@ -1180,6 +1180,14 @@ static int validate_code(struct jit_ctx *ctx)
>                         return -1;
>         }
>
> +       return 0;
> +}
> +
> +static int validate_ctx(struct jit_ctx *ctx)
> +{
> +       if (validate_code(ctx))
> +               return -1;
> +
>         if (WARN_ON_ONCE(ctx->num_exentries != ctx->prog->aux->num_exentries))
>                 return -1;
>
> @@ -1288,7 +1296,7 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
>         build_epilogue(&ctx);
>
>         /* 3. Extra pass to validate JITed code */
> -       if (validate_code(&ctx)) {
> +       if (validate_ctx(&ctx)) {
>                 bpf_jit_binary_free(header);
>                 prog = orig_prog;
>                 goto out_offset;
> --
> 2.25.1
>