From patchwork Sun Aug 27 16:10:25 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 806268 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3xgKtB3dTLz9s8w for ; Mon, 28 Aug 2017 02:22:10 +1000 (AEST) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=infradead.org header.i=@infradead.org header.b="PJiOOCrt"; dkim-atps=neutral Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 3xgKtB2TfyzDqKl for ; Mon, 28 Aug 2017 02:22:10 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=infradead.org header.i=@infradead.org header.b="PJiOOCrt"; dkim-atps=neutral X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3xgKdD1WdXzDqZr for ; Mon, 28 Aug 2017 02:10:56 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=infradead.org header.i=@infradead.org header.b="PJiOOCrt"; dkim-atps=neutral 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=Uwu+9A0z95q/irkl2CO2BDnLQWOKgUa9OVgShS5p5uE=; b=PJiOOCrt3FVLiLl+AWE3ThKB/ qKCRES1Doj/FHIaQapWEeMl8ZammS4W3YB3q95OB2QtaJcKVd7qFfs4Z9md1lSuSwZn7uz9rz7vXb HQmxnFU1og9u+ukxmlqnsMz7Tcx5e60JGHiyhEE1D6fG/EuuuoI2d7OZp9Cniix8icD9o2pW5m6vT V+mym6JJxxNVD2p1BhjGoB+WN0q5qCBkN1yP2aR2BxYkyOSuN7NtfWXbH6XTdqLGidnmyxkRhNsXa ZUN98M0i8Gl1OYREB5l22DpfN0sPmErsHAK7Jno/p4yhWJsAQcedahCxPIuX7FgvxPWh/L0ihXUsd hkJAzdZQg==; 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 1dm09A-0006sA-Pe; Sun, 27 Aug 2017 16:10:49 +0000 From: Christoph Hellwig To: iommu@lists.linux-foundation.org Subject: [PATCH 05/12] ia64: make dma_cache_sync a no-op Date: Sun, 27 Aug 2017 18:10:25 +0200 Message-Id: <20170827161032.22772-6-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 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Chris Zankel , Michal Simek , linux-ia64@vger.kernel.org, linux-mips@linux-mips.org, linux-sh@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-xtensa@linux-xtensa.org, x86@kernel.org, linux-kernel@vger.kernel.org, David Howells , Max Filippov , Guan Xuetao , Robin Murphy , Marek Szyprowski Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" ia64 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/ia64/include/asm/dma-mapping.h | 5 ----- 1 file changed, 5 deletions(-) diff --git a/arch/ia64/include/asm/dma-mapping.h b/arch/ia64/include/asm/dma-mapping.h index 3ce5ab4339f3..99dfc1aa9d3c 100644 --- a/arch/ia64/include/asm/dma-mapping.h +++ b/arch/ia64/include/asm/dma-mapping.h @@ -48,11 +48,6 @@ static inline void dma_cache_sync (struct device *dev, void *vaddr, size_t size, enum dma_data_direction dir) { - /* - * IA-64 is cache-coherent, so this is mostly a no-op. However, we do need to - * ensure that dma_cache_sync() enforces order, hence the mb(). - */ - mb(); } #endif /* _ASM_IA64_DMA_MAPPING_H */