linux-kernel - Re: [PATCH bpf-next v4 1/2] bpf: support bpf_get_func_arg() for BPF_TRACE_RAW

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Message-ID: <7c3f053b-252b-4389-9327-e2b3f2c67c94@linux.dev>
Date: Tue, 20 Jan 2026 14:49:53 -0800
From: Yonghong Song <yonghong.song@...ux.dev>
To: Menglong Dong <menglong8.dong@...il.com>, ast@...nel.org,
 andrii@...nel.org
Cc: daniel@...earbox.net, john.fastabend@...il.com, martin.lau@...ux.dev,
 eddyz87@...il.com, song@...nel.org, kpsingh@...nel.org, sdf@...ichev.me,
 haoluo@...gle.com, jolsa@...nel.org, mattbobrowski@...gle.com,
 rostedt@...dmis.org, mhiramat@...nel.org, mathieu.desnoyers@...icios.com,
 bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next v4 1/2] bpf: support bpf_get_func_arg() for
 BPF_TRACE_RAW_TP



On 1/19/26 11:30 PM, Menglong Dong wrote:
> For now, bpf_get_func_arg() and bpf_get_func_arg_cnt() is not supported by
> the BPF_TRACE_RAW_TP, which is not convenient to get the argument of the
> tracepoint, especially for the case that the position of the arguments in
> a tracepoint can change.
>
> The target tracepoint BTF type id is specified during loading time,
> therefore we can get the function argument count from the function
> prototype instead of the stack.
>
> Signed-off-by: Menglong Dong <dongml2@...natelecom.cn>

Acked-by: Yonghong Song <yonghong.song@...ux.dev>