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

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Message-ID: <2025071435-disorder-obliged-b74e@gregkh>
Date: Mon, 14 Jul 2025 15:56:14 +0200
From: Greg KH <gregkh@...uxfoundation.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 09:35:47AM -0400, Steven Rostedt wrote:
> On Mon, 14 Jul 2025 15:26:47 +0200
> Greg KH <gregkh@...uxfoundation.org> wrote:
> 
> > As it seems that we do have other tracing/perf developers already, start
> > with them and go forward to see what they say.
> 
> We tried that. I don't have the time and I'm sure the perf folks don't
> care. I advocate for LTTng because of the support that Mathieu has given
> us.

When was this last tried?  If you don't have time, then the fault is on
you, not us :)

> The only other option is to allow LTTng to have access to a couple of
> functions that Mathieu helped develop. Otherwise it's forcing me to say
> "Thank you Mathieu for all your work, now go F*** off!".
> 
> Which appears to be the only option :-(

Stop making this false argument please, we aren't telling anyone
anything different from what we have always been saying for decades now.

Again, we don't export symbols for when there are no in-tree users.
That's it.

lttng not getting merged because you don't have time to review it should
not make the above rule somehow invalid.

sorry,

greg k-h