linux-kernel - Re: [PATCH bpf-next v2 00/13] bpf: Kernel functions with KF_IMPLICIT

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Message-ID: <088b071d1a43b403123d772f56ce033e91cb4252.camel@gmail.com>
Date: Mon, 19 Jan 2026 17:49:05 -0800
From: Eduard Zingerman <eddyz87@...il.com>
To: Ihor Solodrai <ihor.solodrai@...ux.dev>, Alexei Starovoitov
 <ast@...nel.org>,  Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko
 <andrii@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>
Cc: Mykyta Yatsenko <yatsenko@...a.com>, Tejun Heo <tj@...nel.org>, Alan
 Maguire <alan.maguire@...cle.com>, Benjamin Tissoires <bentiss@...nel.org>,
 Jiri Kosina	 <jikos@...nel.org>, Amery Hung <ameryhung@...il.com>,
 bpf@...r.kernel.org, 	linux-kernel@...r.kernel.org,
 linux-input@...r.kernel.org, 	sched-ext@...ts.linux.dev
Subject: Re: [PATCH bpf-next v2 00/13] bpf: Kernel functions with
 KF_IMPLICIT_ARGS

On Fri, 2026-01-16 at 12:16 -0800, Ihor Solodrai wrote:

[...]

> v1->v2:
>   - Replace the following kernel functions with KF_IMPLICIT_ARGS version:
>     - bpf_stream_vprintk_impl -> bpf_stream_vprintk
>     - bpf_task_work_schedule_resume_impl -> bpf_task_work_schedule_resume
>     - bpf_task_work_schedule_signal_impl -> bpf_task_work_schedule_signal
>     - bpf_wq_set_callback_impl -> bpf_wq_set_callback_impl

Just to clarify my understanding, this is a breaking change, right?
E.g. bpf_stream_vprintk_impl is no longer in vmlinux.h and on a load
attempt an error is reported:

  kfunc 'bpf_stream_vprintk_impl' is referenced but wasn't resolved

Maybe call it out explicitly in the cover letter?