From patchwork Sun Aug 27 16:10:24 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 9923941 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 3847560380 for ; Sun, 27 Aug 2017 16:13:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2B10228632 for ; Sun, 27 Aug 2017 16:13:55 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1E20D28634; Sun, 27 Aug 2017 16:13:55 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 91ACD28632 for ; Sun, 27 Aug 2017 16:13:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751755AbdH0QNj (ORCPT ); Sun, 27 Aug 2017 12:13:39 -0400 Received: from bombadil.infradead.org ([65.50.211.133]:49668 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751262AbdH0QKw (ORCPT ); Sun, 27 Aug 2017 12:10:52 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=References:In-Reply-To:Message-Id: Date:Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding: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=idhnBhK7pcQ+TiokQhFp8UjAzFJvfiAnFn/mrRCFV0g=; b=ntLleRxxs23AixW4QEsmx5uIq CLVzTlytAAz8c89c7xrBz78bP3T6FGw9EEUnNEMpMWKom/aqYmF/5X6BmdNHl+qj23pZnf4Q1F3H9 OHCqXJTkwjFLCbtdyXu+CppVn3KnX9/4/eFnioUzfMSGdL1xtS4VuC8OVwkHuvPwydJfoW5iJxXtO VVkCLJK/ErL9qVLUuxQjoL7cThOMYyqxigQg8nEjb9nKzdFdgvEfqG5dQRrQImdJZoVWi3BwkCjHb DnSB6yHgv/7pwV5MPR0l47pKqvR6ejQPVcFoceOniJT5t/emqZvUbAabGwinEbJFnmTj1tOmTOp/e v/oC3m3Yg==; Received: from clnet-p099-196.ikbnet.co.at ([83.175.99.196] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.87 #1 (Red Hat Linux)) id 1dm098-0006rl-1o; Sun, 27 Aug 2017 16:10:46 +0000 From: Christoph Hellwig To: iommu@lists.linux-foundation.org Cc: Marek Szyprowski , Robin Murphy , Michal Simek , David Howells , Guan Xuetao , Chris Zankel , Max Filippov , x86@kernel.org, linux-mips@linux-mips.org, linux-ia64@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-xtensa@linux-xtensa.org, linux-sh@vger.kernel.org, linux-kernel@vger.kernel.org, Christoph Hellwig Subject: [PATCH 04/12] x86: make dma_cache_sync a no-op Date: Sun, 27 Aug 2017 18:10:24 +0200 Message-Id: <20170827161032.22772-5-hch@lst.de> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170827161032.22772-1-hch@lst.de> References: <20170827161032.22772-1-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP x86 does not implement DMA_ATTR_NON_CONSISTENT allocations, so it doesn't make any sense to do any work in dma_cache_sync given that it must be a no-op when dma_alloc_attrs returns coherent memory. Signed-off-by: Christoph Hellwig --- arch/x86/include/asm/dma-mapping.h | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h index 398c79889f5c..04877267ad18 100644 --- a/arch/x86/include/asm/dma-mapping.h +++ b/arch/x86/include/asm/dma-mapping.h @@ -70,7 +70,6 @@ static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size, enum dma_data_direction dir) { - flush_write_buffers(); } static inline unsigned long dma_alloc_coherent_mask(struct device *dev,