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

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Message-ID: <aR5nEnP2PWJ7G7yp@zx2c4.com>
Date: Thu, 20 Nov 2025 01:55:46 +0100
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Asbjørn Sloth Tønnesen <ast@...erby.net>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	Donald Hunter <donald.hunter@...il.com>,
	Simon Horman <horms@...nel.org>,
	Jacob Keller <jacob.e.keller@...el.com>,
	Andrew Lunn <andrew+netdev@...n.ch>, wireguard@...ts.zx2c4.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jordan Rife <jordan@...fe.io>
Subject: Re: [PATCH net-next v3 07/11] uapi: wireguard: generate header with
 ynl-gen

On Tue, Nov 18, 2025 at 04:53:15PM -0800, Jakub Kicinski wrote:
> 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 <Jason@...c4.com>. 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..

I was thinking that doing this automatically at compile-time or
install-time would be _less_ complicated, not more, since everything
would be kept in sync automatically and such. But alright, so be it.