From nobody Mon Apr 27 08:41:09 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 94C27C43334 for ; Wed, 15 Jun 2022 09:06:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243932AbiFOJGs (ORCPT ); Wed, 15 Jun 2022 05:06:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45870 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235935AbiFOJGo (ORCPT ); Wed, 15 Jun 2022 05:06:44 -0400 Received: from mail-pj1-x1043.google.com (mail-pj1-x1043.google.com [IPv6:2607:f8b0:4864:20::1043]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 026A83A739; Wed, 15 Jun 2022 02:06:44 -0700 (PDT) Received: by mail-pj1-x1043.google.com with SMTP id v11-20020a17090a4ecb00b001e2c5b837ccso1493358pjl.3; Wed, 15 Jun 2022 02:06:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=CXhk1iX0j0cRqg2v0/nsYGsi9fNJeaTXvM2J8kFqgnw=; b=WO8UeaeHx+RhZcSEPzoaksikiXQ9T7WphV+R1vGRRs3nlkWoc5v4wulx/FNc8t3pP8 XuTkj6FgHuPaVqR6MoGRmTHN4s/l+VvZoZlBT/Mz+48tkA3cQ4FmhGsaLTSlfakAu9Pt 7nAI8YlZEFr6szqo8htQ9ckwMilAH4klEhKLCt414X1vDZgbSylJOEgHbvE75CCrpZuQ KnHhLNHyYf4tWFYIvtdU/IHuTz/DfACAAdBTUqZTHnG+36pEmTprmzjmoW6RCvab0keB R/Zndm5RoqphpRT9MLeykyYaW28D4AZIHqqxg6iv47N9UDo7qyBSBXMMO6hZi29RVqHy t9/Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=CXhk1iX0j0cRqg2v0/nsYGsi9fNJeaTXvM2J8kFqgnw=; b=l+ExGAU0Q51pb51dP1mxqQyctfduPHEJ87h4jzwPwisEdASOvWAKlCO7NP/Bes50Xl vUOt8f7xgbgI0qnqKEIzI3TKY73WTWnTLedcLKrSxrphNuVgqjHXMnzGCze+eC/hZDfX axnXrUZ5OUnOVYoc6xczl/xvnXjtdywyM1c2oezNRFmzuFJJYHj8EzAPjLegyF19iEPq omSbXLbZJNfXUzzX8qtiNalitY1FAgeF1sFmSuaUZfr1lmPa/eN28jI6ColRq778Pvl3 eewe9eXcQsxQhmaiHBiwfJcCaoTEGKlUtNvCoRjuwqzgnniu6BhPDAoFeIdcI8lS+2IJ B41g== X-Gm-Message-State: AJIora9VVZtXFGgEWIRjHprpl7w4Nt78htWCoO1keueSzKAY6pU1rfMA 7OX7LHueCz+YCSrTXf9DEdE= X-Google-Smtp-Source: AGRyM1sU0k3W0fNgy4AXqClk96xssdjDtPCRN9ULmCaXODsIJrzLySWTaMsU/e4EIMNIu1dSxiNjVQ== X-Received: by 2002:a17:902:f64c:b0:156:7ceb:b579 with SMTP id m12-20020a170902f64c00b001567cebb579mr8327611plg.73.1655284003404; Wed, 15 Jun 2022 02:06:43 -0700 (PDT) Received: from localhost.localdomain ([203.205.141.111]) by smtp.gmail.com with ESMTPSA id p10-20020a62b80a000000b0050dc76281aasm9227748pfe.132.2022.06.15.02.06.41 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Wed, 15 Jun 2022 02:06:42 -0700 (PDT) From: korantwork@gmail.com To: dave.hansen@linux.intel.com, tglx@linutronix.de Cc: linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org, trivial@kernel.org, Xinghui Li Subject: [PATCH] x86,iommu:cleanup misleading comment about SWIOTLB turned off by IOMMU Date: Wed, 15 Jun 2022 17:06:39 +0800 Message-Id: <20220615090639.34402-1-korantwork@gmail.com> X-Mailer: git-send-email 2.36.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Xinghui Li According to commit 327d5b2fee91 ("iommu/vt-d: Allow 32bit devices to uses DMA domain"), SWIOTLB could be enable even IOMMU exist.This comment could mislead developer that there is an error enabling SWIOTLB when they enable IOMMU. Signed-off-by: Xinghui Li --- arch/x86/kernel/pci-dma.c | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c index 30bbe4abb5d6..c0434abf7e09 100644 --- a/arch/x86/kernel/pci-dma.c +++ b/arch/x86/kernel/pci-dma.c @@ -193,7 +193,6 @@ static int __init pci_iommu_init(void) x86_init.iommu.iommu_init(); =20 #ifdef CONFIG_SWIOTLB - /* An IOMMU turned us off. */ if (x86_swiotlb_enable) { pr_info("PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n"); swiotlb_print_info(); --=20 2.25.1