linux-kernel - Re: [RFC PATCH 2/5] unwind: Export unwind

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Message-ID: <aHYA9IPs5QiX-QLs@infradead.org>
Date: Tue, 15 Jul 2025 00:19:16 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Christoph Hellwig <hch@...radead.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-kernel@...r.kernel.org, Josh Poimboeuf <jpoimboe@...nel.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrii Nakryiko <andrii@...nel.org>,
	Indu Bhagat <indu.bhagat@...cle.com>,
	"Jose E. Marchesi" <jemarch@....org>,
	Beau Belgrave <beaub@...ux.microsoft.com>,
	Jens Remus <jremus@...ux.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	tech-board-discuss@...ts.linuxfoundation.org
Subject: Re: [RFC PATCH 2/5] unwind: Export unwind_user symbol to GPL modules

On Mon, Jul 14, 2025 at 07:54:26AM -0400, Steven Rostedt wrote:
> On Mon, 14 Jul 2025 04:38:33 -0700
> Christoph Hellwig <hch@...radead.org> wrote:
> 
> > On Mon, Jul 14, 2025 at 06:27:24AM -0400, Steven Rostedt wrote:
> > > This has nothing to do with Mathieu being a friend. He's a long time Linux
> > > kernel contributor and has played a key role in developing a new feature
> > > that will help both perf and ftrace, but without the EXPORT_SYMBOL_GPL(),
> > > LTTng can't use it. It's basically saying "thank you Mathieu for helping us
> > > with this new feature, now go F*** off!"  
> > 
> > You don't have to be as explicit, but otherwise that's exactly how
> > it works.  No one gets a free ride just because they are nice and/or
> > contributed something.
> 
> Why is that?

Why would it be any different?  We have a clear reason both for technical
reasons, and to get code upstream.  Making exceptions for vaguely defined
friends and family defeats the entire purpose.

If you want to help Mathieu or others do that by putting your effort
behind the cause instead of making up exceptions.

> How would you recommend getting LTTng into the kernel? It's a relatively
> large project that has 75K of lines of code with development that lasted
> around 20 years.

I honestly don't care.  Not my business.  And you're probably also
asking the wrong question, as those giant old out of tree projects
tend to be a mess because of that.  The right question is really what
functionality does LTTng have that we want in the kernel and work on
that.