Subject: Re: [PATCH net-next v3 07/11] uapi: wireguard: generate header with ynl-gen

From: Jakub Kicinski <[email-masked]>
Date: Tue, 18 Nov 2025 16:53:15 -0800

On Tue, 18 Nov 2025 16:17:21 +0100 Jason A. Donenfeld wrote:
> On Wed, Nov 05, 2025 at 06:32:16PM +0000, Asbjørn Sloth Tønnesen wrote:
> > Use ynl-gen to generate the UAPI header for wireguard.
> > diff --git a/include/uapi/linux/wireguard.h b/include/uapi/linux/wireguard.h
> > index a2815f4f2910..dc3924d0c552 100644
> > --- a/include/uapi/linux/wireguard.h
> > +++ b/include/uapi/linux/wireguard.h
> > @@ -1,32 +1,28 @@
> > -/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR MIT */
> > -/*
> > - * Copyright (C) 2015-2019 Jason A. Donenfeld <[email-masked]>. All Rights Reserved.
> > - */
> > +/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
> > +/* Do not edit directly, auto-generated from: */
> > +/*	Documentation/netlink/specs/wireguard.yaml */
> > +/* YNL-GEN uapi header */  
> 
> Same desire here -- can this get auto generated at compile time (or in
> headers_install time).

IMHO generating uAPI on the fly has more downsides than benefits.
For one thing people grepping the code and looking and lxr will
never find the definition. All the user space code in tools/ is
generated at build time, but the amount of kernel code we generate
is not significant at this stage. Not significant enough to complicate
everyone's life..