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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 6EF82C6787C for ; Sun, 14 Oct 2018 08:59:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2723320835 for ; Sun, 14 Oct 2018 08:59:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2723320835 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linutronix.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726456AbeJNQiV (ORCPT ); Sun, 14 Oct 2018 12:38:21 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:53674 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726265AbeJNQiV (ORCPT ); Sun, 14 Oct 2018 12:38:21 -0400 Received: from p5492fe24.dip0.t-ipconnect.de ([84.146.254.36] helo=nanos) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1gBcDm-0000UA-4G; Sun, 14 Oct 2018 10:57:58 +0200 Date: Sun, 14 Oct 2018 10:57:57 +0200 (CEST) From: Thomas Gleixner To: Christoph Hellwig cc: x86@kernel.org, tedheadster@gmail.com, konrad.wilk@oracle.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] x86: enable swiotlb for > 4GiG ram on 32-bit kernels In-Reply-To: <20181014081443.GA17889@lst.de> Message-ID: References: <20181014075208.2715-1-hch@lst.de> <20181014081443.GA17889@lst.de> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 14 Oct 2018, Christoph Hellwig wrote: > On Sun, Oct 14, 2018 at 10:13:31AM +0200, Thomas Gleixner wrote: > > On Sun, 14 Oct 2018, Christoph Hellwig wrote: > > > > > We already build the swiotlb code for 32b-t kernels with PAE support, > > > but the code to actually use swiotlb has only been enabled for 64-bit > > > kernel for an unknown reason. > > > > > > Before Linux 4.18 we papers over this fact because the networking code, > > > the scsi layer and some random block drivers implenented their own > > > bounce buffering scheme. > > > > > > Fixes: 21e07dba ("scsi: reduce use of block bounce buffers") Please use the first 12 characters of the commit SHA for fixes tags in the future, as documented. No need to resend, I fixed it up for you and added a Cc: stable as well Thanks, tglx