From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by kanga.kvack.org (Postfix) with SMTP id F05D46B0148 for ; Mon, 27 Jun 2011 09:22:18 -0400 (EDT) From: Arnd Bergmann Subject: Re: [PATCH 7/8] common: dma-mapping: change alloc/free_coherent method to more generic alloc/free_attrs Date: Mon, 27 Jun 2011 15:22:05 +0200 References: <1308556213-24970-1-git-send-email-m.szyprowski@samsung.com> <201106241751.35655.arnd@arndb.de> <000701cc34c5$0c50b800$24f22800$%szyprowski@samsung.com> In-Reply-To: <000701cc34c5$0c50b800$24f22800$%szyprowski@samsung.com> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <201106271522.05486.arnd@arndb.de> Sender: owner-linux-mm@kvack.org List-ID: To: Marek Szyprowski Cc: linux-arm-kernel@lists.infradead.org, linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, 'Kyungmin Park' , 'Joerg Roedel' , 'Russell King - ARM Linux' On Monday 27 June 2011, Marek Szyprowski wrote: > > On a related note, do you plan to make the CMA work use this > > transparently, or do you want to have a DMA_ATTR_LARGE or > > DMA_ATTR_CONTIGUOUS for CMA? > > IMHO it will be better to hide the CMA from the drivers. Memory allocated > from CMA doesn't really differ from the one allocated by dma_alloc_coherent() > (which internally use alloc_pages()), so I really see no reason for adding > additional attribute for it. Ok, fair enough. On a semi-related topic, IIRC we still need to make sure that dma_alloc_coherent() pages are unmapped from the linear mapping. I hope this is independent of both CMA and this patch. Arnd -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org