linux-kernel - Re: [PATCH] bpf: Fix ___bpf_kretprobe

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Date:   Sun, 15 Mar 2020 10:23:45 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Wenbo Zhang <ethercflow@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] bpf: Fix ___bpf_kretprobe_args1(x) macro definition.

On Sun, Mar 15, 2020 at 1:33 AM Wenbo Zhang <ethercflow@...il.com> wrote:
>
> Use PT_REGS_RC instead of PT_REGS_RET to get ret currectly.
>
> Signed-off-by: Wenbo Zhang <ethercflow@...il.com>
> ---

Thanks!

Fixes: df8ff35311c8 ("libbpf: Merge selftests' bpf_trace_helpers.h
into libbpf's bpf_tracing.h")
Acked-by: Andrii Nakryiko <andriin@...com>

>  tools/lib/bpf/bpf_tracing.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h
> index b0c9ae5c73b5..f3f3c3fb98cb 100644
> --- a/tools/lib/bpf/bpf_tracing.h
> +++ b/tools/lib/bpf/bpf_tracing.h
> @@ -390,7 +390,7 @@ ____##name(struct pt_regs *ctx, ##args)
>
>  #define ___bpf_kretprobe_args0() ctx
>  #define ___bpf_kretprobe_args1(x) \
> -       ___bpf_kretprobe_args0(), (void *)PT_REGS_RET(ctx)
> +       ___bpf_kretprobe_args0(), (void *)PT_REGS_RC(ctx)
>  #define ___bpf_kretprobe_args(args...) \
>         ___bpf_apply(___bpf_kretprobe_args, ___bpf_narg(args))(args)
>
> --
> 2.17.1
>