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=-8.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 201FAC00449 for ; Mon, 8 Oct 2018 08:03:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D6CE620878 for ; Mon, 8 Oct 2018 08:03:08 +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="KuDnEfE9" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D6CE620878 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.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 S1727001AbeJHPNe (ORCPT ); Mon, 8 Oct 2018 11:13:34 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:55480 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725973AbeJHPNd (ORCPT ); Mon, 8 Oct 2018 11:13:33 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=f0Z2MSGqIn5pk2KJ0GqZtlNn51ct0DesVW2XhhwWBe4=; b=KuDnEfE9abrB3PWKSNC34425+j t4gA4gBOoJ0Ln9wbk+5BO5QoITLpSC7WTguQ4BH/v/iY5LRPSZRlrpEMAfC8nQM58822cmpp90Mx5 XGEs8NkWTlt5i2eZZMpsud0AQnbU5naQ+k2doDIFL17PkhCibnNY883nNmRQyFy3rElxQW2+D6PqO MVwQoxdq7fRJc9wAyfQG4Du/N06agh8DOrQWzQqVHnJBtOg7IPwsf4fRpTy3jTplLFbstTc0C5yYL b/lUKRtiHc5z+POsbZIN0faQUMsKF6I8vgamiI19aVH82ipOJ3ArgJKZNp9nnJYW3fDeFMQr/LbGo S8rtRjJQ==; Received: from 089144207060.atnat0016.highway.bob.at ([89.144.207.60] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1g9QVC-00027w-QD; Mon, 08 Oct 2018 08:02:55 +0000 From: Christoph Hellwig To: Will Deacon , Catalin Marinas , Robin Murphy , Konrad Rzeszutek Wilk Cc: linux-arm-kernel@lists.infradead.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: [PATCH 01/10] swiotlb: remove a pointless comment Date: Mon, 8 Oct 2018 10:02:37 +0200 Message-Id: <20181008080246.20543-2-hch@lst.de> X-Mailer: git-send-email 2.19.0 In-Reply-To: <20181008080246.20543-1-hch@lst.de> References: <20181008080246.20543-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This comments describes an aspect of the map_sg interface that isn't even exploited by swiotlb. Signed-off-by: Christoph Hellwig --- kernel/dma/swiotlb.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index 4f8a6dbf0b60..9062b14bc7f4 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -925,12 +925,6 @@ swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, * appropriate dma address and length. They are obtained via * sg_dma_{address,length}(SG). * - * NOTE: An implementation may be able to use a smaller number of - * DMA address/length pairs than there are SG table elements. - * (for example via virtual mapping capabilities) - * The routine returns the number of addr/length pairs actually - * used, at most nents. - * * Device ownership issues as mentioned above for swiotlb_map_page are the * same here. */ -- 2.19.0