linux-kernel - Re: [PATCH bpf-next v1 08/10] bpf: Add bpf_task_work_schedule_* kfuncs with KF_IMPLICIT

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Message-ID: <CAADnVQJDv80_T+1jz=7_8y+8hRTjMqqkm38in2er8iRU-p9W+g@mail.gmail.com>
Date: Fri, 9 Jan 2026 11:58:11 -0800
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Ihor Solodrai <ihor.solodrai@...ux.dev>
Cc: Alexei Starovoitov <ast@...nel.org>, Andrii Nakryiko <andrii@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, Martin KaFai Lau <martin.lau@...ux.dev>, 
	Eduard Zingerman <eddyz87@...il.com>, 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>, bpf <bpf@...r.kernel.org>, 
	LKML <linux-kernel@...r.kernel.org>, 
	"open list:HID CORE LAYER" <linux-input@...r.kernel.org>, sched-ext@...ts.linux.dev
Subject: Re: [PATCH bpf-next v1 08/10] bpf: Add bpf_task_work_schedule_*
 kfuncs with KF_IMPLICIT_ARGS

On Fri, Jan 9, 2026 at 10:50 AM Ihor Solodrai <ihor.solodrai@...ux.dev> wrote:
>
> +__bpf_kfunc int bpf_task_work_schedule_signal(struct task_struct *task, struct bpf_task_work *tw,
> +                                             void *map__map, bpf_task_work_callback_t callback,
> +                                             struct bpf_prog_aux *aux)
> +{
> +       return bpf_task_work_schedule(task, tw, map__map, callback, aux, TWA_SIGNAL);
> +}
> +
>  __bpf_kfunc int bpf_task_work_schedule_signal_impl(struct task_struct *task,
>                                                    struct bpf_task_work *tw, void *map__map,
>                                                    bpf_task_work_callback_t callback,
>                                                    void *aux__prog)
>  {
> -       return bpf_task_work_schedule(task, tw, map__map, callback, aux__prog, TWA_SIGNAL);
> +       return bpf_task_work_schedule_signal(task, tw, map__map, callback, aux__prog);
>  }

I thought we decided that _impl() will not be marked as __bpf_kfunc
and will not be in BTF_ID(func, _impl).
We can mark it as __weak noinline and it will be in kallsyms.
That's all we need for the verifier and resolve_btfid, no?

Sorry, it's been a long time. I must have forgotten something.