From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AC15226F471 for ; Tue, 15 Jul 2025 07:19:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752563961; cv=none; b=f4Ob1z4WQDxXLajfEC5mV4qom+2grMlD24lghPkIQ0i9PBp+LZ+6KpA/WCVGlyjw6hXyliNSSyLOQvTYgRtAU3vG3jxXPx8LDVsHBX5COEeC9cqWOg3yyb3QurVug6IUZVK9ZwY6ajEb0kCbrsIaOU0FT2uFvHBEsMo2bEVgy3w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752563961; c=relaxed/simple; bh=Aj5SxkP3pbJtiSAJWgrM03m/j1mRYKafX3o4uGhsOrM=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=X/a7gyrjgby16LKUknVzRDaizCHmyDDuvuMyHO0w9ovh21wOk0Cu9OvfyXbT1ka0kE/otC7wmDrQ1haDdjO1dLUdsE078ibsMgtxEGZwTI8QOtT4ljC1VqjPy0IPCCUH7LNdDZ8D1o1v9Ly3BHhM+eXWFeFkSmjtR60hK3gBOMU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=XBY3Z/Fe; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="XBY3Z/Fe" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=OFtDJohQGlOhGcPgxY5jVmvQrgNWThXXIGfuiBYm42Y=; b=XBY3Z/Fe4tZp8l2NH9Mae0Qs2Z XMEYhlDmlFXmTmMmEDGFIAlKUmDndlnNKhdiuEPn4g/V799fEqvLtltqtS3c3bmRYWFhGZzEtxkFn L8OVWSLYviiANNlCfV09iVJQv/i8j86Qnrm1HpLko1e9VFhtcfCcXlv4qSKw34zy1a8ZaggAb8Z5k t28em/bbscgVKNjY+H0i9OKZG9SAI5KLcXfICUVB27vawQ3l/0Jc1ToKK4hVOwr6cqPVfE1dT40k/ kFBPGLF5f2psKn86Ns0QW8zVYkTsaNgRN3UHFMbNDBkrOzImBdHUd+qkBQQgpMUHzpY5O4hI5cqq2 B8LA5IJQ==; Received: from hch by bombadil.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1ubZwa-00000004JJB-3Ozc; Tue, 15 Jul 2025 07:19:16 +0000 Date: Tue, 15 Jul 2025 00:19:16 -0700 From: Christoph Hellwig To: Steven Rostedt Cc: Christoph Hellwig , Mathieu Desnoyers , linux-kernel@vger.kernel.org, Josh Poimboeuf , Masami Hiramatsu , Peter Zijlstra , Ingo Molnar , Jiri Olsa , Namhyung Kim , Thomas Gleixner , Andrii Nakryiko , Indu Bhagat , "Jose E. Marchesi" , Beau Belgrave , Jens Remus , Linus Torvalds , Andrew Morton , tech-board-discuss@lists.linuxfoundation.org Subject: Re: [RFC PATCH 2/5] unwind: Export unwind_user symbol to GPL modules Message-ID: References: <20250709212556.32777-1-mathieu.desnoyers@efficios.com> <20250709212556.32777-3-mathieu.desnoyers@efficios.com> <20250711065742.00d6668b@gandalf.local.home> <20250714062724.6febd9fb@gandalf.local.home> <20250714075426.36bdda0b@gandalf.local.home> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250714075426.36bdda0b@gandalf.local.home> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html On Mon, Jul 14, 2025 at 07:54:26AM -0400, Steven Rostedt wrote: > On Mon, 14 Jul 2025 04:38:33 -0700 > Christoph Hellwig 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.