From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 203AAC55179 for ; Mon, 2 Nov 2020 07:29:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D587A22275 for ; Mon, 2 Nov 2020 07:29:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Erkn5URR" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728126AbgKBH3i (ORCPT ); Mon, 2 Nov 2020 02:29:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39932 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728064AbgKBH3h (ORCPT ); Mon, 2 Nov 2020 02:29:37 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 79640C0617A6; Sun, 1 Nov 2020 23:29:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=7kqil5vrmEb2Nddp3OQTQBXQGkc9niPiGcaNE67tBY8=; b=Erkn5URR+wSGh9C0rgWsbo+p9y ppm6PQDbDGHOGGA2h3Hrj/hAaUJmZb7bckVW0bAUthsA1/1XR/stYVsLsHGSL+0cUvzAzwZBKG4Z+ 1X+JPSn7x/00wDea9bTorvr41bTNvJ1tZplphwfSACELJOmWElB84jaIHXnye8gKSTw7PYtIkp+cK WGyQCz7gr/AM/kILQY6/E3kR8Ur/Rw382iwx+IpLcP8isCw9xGb2Ye7bH/QCr3P+yArX+AJnphOaO aU9VCRUV9hCMajGMKNzrOpgkRoBtDaIgpUmG5ro2Cv7DaRGobrM3PjNsUJlNDtS1sygQt/v3/GLna efXx4F/w==; Received: from hch by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kZUHU-0004O4-0T; Mon, 02 Nov 2020 07:29:32 +0000 Date: Mon, 2 Nov 2020 07:29:31 +0000 From: Christoph Hellwig To: Daniel Vetter Cc: DRI Development , LKML , kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, Daniel Vetter , Christoph Hellwig , Jason Gunthorpe , Kees Cook , Dan Williams , Andrew Morton , John Hubbard , J??r??me Glisse , Jan Kara Subject: Re: [PATCH v5 08/15] mm: Add unsafe_follow_pfn Message-ID: <20201102072931.GA16419@infradead.org> References: <20201030100815.2269-1-daniel.vetter@ffwll.ch> <20201030100815.2269-9-daniel.vetter@ffwll.ch> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201030100815.2269-9-daniel.vetter@ffwll.ch> X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org On Fri, Oct 30, 2020 at 11:08:08AM +0100, Daniel Vetter wrote: > Also mark up follow_pfn as EXPORT_SYMBOL_GPL. The only safe way to use > that by drivers/modules is together with an mmu_notifier, and that's > all _GPL stuff. I also think it also needs to be renamed to explicitly break any existing users out of tree or int the submission queue.