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=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 0E749C433B4 for ; Mon, 12 Apr 2021 08:26:46 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 8B652611C9 for ; Mon, 12 Apr 2021 08:26:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8B652611C9 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 198C96B0036; Mon, 12 Apr 2021 04:26:45 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 149DE6B006C; Mon, 12 Apr 2021 04:26:45 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0105C6B006E; Mon, 12 Apr 2021 04:26:44 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0240.hostedemail.com [216.40.44.240]) by kanga.kvack.org (Postfix) with ESMTP id DBCBE6B0036 for ; Mon, 12 Apr 2021 04:26:44 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 85E14180275DE for ; Mon, 12 Apr 2021 08:26:44 +0000 (UTC) X-FDA: 78023033928.05.2FEB68B Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by imf16.hostedemail.com (Postfix) with ESMTP id 73BBB80192D8 for ; Mon, 12 Apr 2021 08:26:43 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 62A7B68C65; Mon, 12 Apr 2021 10:26:40 +0200 (CEST) Date: Mon, 12 Apr 2021 10:26:40 +0200 From: Christoph Hellwig To: Peter Zijlstra Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, x86@kernel.org, jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com, rodrigo.vivi@intel.com, chris@chris-wilson.co.uk, intel-gfx@lists.freedesktop.org, linux-mm@kvack.org, keescook@chromium.org, hch@lst.de Subject: Re: [PATCH 2/7] xen/gntdev,x86: Remove apply_to_page_range() use from module Message-ID: <20210412082640.GB4372@lst.de> References: <20210412080012.357146277@infradead.org> <20210412080611.635125063@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210412080611.635125063@infradead.org> User-Agent: Mutt/1.5.17 (2007-11-01) X-Rspamd-Queue-Id: 73BBB80192D8 X-Stat-Signature: 3pit7rux9h8twokw17x5k1j834ezfbmz X-Rspamd-Server: rspam02 Received-SPF: none (lst.de>: No applicable sender policy available) receiver=imf16; identity=mailfrom; envelope-from=""; helo=verein.lst.de; client-ip=213.95.11.211 X-HE-DKIM-Result: none/none X-HE-Tag: 1618216003-171107 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 Mon, Apr 12, 2021 at 10:00:14AM +0200, Peter Zijlstra wrote: > Instead of relying on apply_to_page_range() being available to > modules, move its use into core kernel code and export it's > application. This doesn't exactly look great, but at least it contains the damage.. > > NOTE: ideally we do: use_ptemod = !auto_translate_physmap && > gnttab_map_avail_bits and remove this hack. Given how much pain the !auto_translate_physmap case causes all over the kernel I wonder what a realistic timeline might be for dropping support for this case might be..