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 0CA42C433DB for ; Wed, 27 Jan 2021 07:11:06 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 32B3620739 for ; Wed, 27 Jan 2021 07:11:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 32B3620739 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 06E546B0005; Wed, 27 Jan 2021 02:11:04 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 01E536B0006; Wed, 27 Jan 2021 02:11:03 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E763C6B0007; Wed, 27 Jan 2021 02:11:03 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0044.hostedemail.com [216.40.44.44]) by kanga.kvack.org (Postfix) with ESMTP id CE97A6B0005 for ; Wed, 27 Jan 2021 02:11:03 -0500 (EST) Received: from smtpin10.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 99BEB180AD83B for ; Wed, 27 Jan 2021 07:11:03 +0000 (UTC) X-FDA: 77750683206.10.trick85_610ba4c27595 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin10.hostedemail.com (Postfix) with ESMTP id 7778816A0D2 for ; Wed, 27 Jan 2021 07:11:03 +0000 (UTC) X-HE-Tag: trick85_610ba4c27595 X-Filterd-Recvd-Size: 1483 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by imf07.hostedemail.com (Postfix) with ESMTP for ; Wed, 27 Jan 2021 07:11:02 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 8FBA767373; Wed, 27 Jan 2021 08:10:59 +0100 (CET) Date: Wed, 27 Jan 2021 08:10:59 +0100 From: Christoph Hellwig To: Konrad Rzeszutek Wilk Cc: Nicholas Piggin , linux-mm@kvack.org, Andrew Morton , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, Robin Murphy , Christoph Hellwig Subject: Re: [PATCH 2/5] kernel/dma: remove unnecessary unmap_kernel_range Message-ID: <20210127071059.GA21133@lst.de> References: <20210126045404.2492588-1-npiggin@gmail.com> <20210126045404.2492588-3-npiggin@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) 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 Tue, Jan 26, 2021 at 05:08:46PM -0500, Konrad Rzeszutek Wilk wrote: > On Tue, Jan 26, 2021 at 02:54:01PM +1000, Nicholas Piggin wrote: > > vunmap will remove ptes. > > Should there be some ASSERT after the vunmap to make sure that is the > case? Not really. removing the PTEs is the whole point of vunmap. Everything else is just house keeping.