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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 ACAE5C4742C for ; Mon, 2 Nov 2020 07:29:42 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3CC32221FF for ; Mon, 2 Nov 2020 07:29:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Erkn5URR" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3CC32221FF Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id BEB476B0068; Mon, 2 Nov 2020 02:29:41 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id B996E6B006C; Mon, 2 Nov 2020 02:29:41 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A3DF76B006E; Mon, 2 Nov 2020 02:29:41 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0053.hostedemail.com [216.40.44.53]) by kanga.kvack.org (Postfix) with ESMTP id 73ECB6B0068 for ; Mon, 2 Nov 2020 02:29:41 -0500 (EST) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 1AF40181AEF10 for ; Mon, 2 Nov 2020 07:29:41 +0000 (UTC) X-FDA: 77438653362.22.touch22_5601687272ae Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin22.hostedemail.com (Postfix) with ESMTP id EA29218038E60 for ; Mon, 2 Nov 2020 07:29:40 +0000 (UTC) X-HE-Tag: touch22_5601687272ae X-Filterd-Recvd-Size: 2587 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf42.hostedemail.com (Postfix) with ESMTP for ; Mon, 2 Nov 2020 07:29:40 +0000 (UTC) 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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.