Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753509Ab0HZMlk (ORCPT ); Thu, 26 Aug 2010 08:41:40 -0400 Received: from bear.ext.ti.com ([192.94.94.41]:42210 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752502Ab0HZMlh convert rfc822-to-8bit (ORCPT ); Thu, 26 Aug 2010 08:41:37 -0400 From: "Guzman Lugo, Fernando" To: FUJITA Tomonori CC: "linux-omap@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "ohad@wizery.com" , "hiroshi.doyu@nokia.com" , "ameya.palande@nokia.com" , "felipe.contreras@nokia.com" Date: Thu, 26 Aug 2010 07:38:26 -0500 Subject: RE: [PATCH 8/9] dspbridge: add map support for big buffers Thread-Topic: [PATCH 8/9] dspbridge: add map support for big buffers Thread-Index: ActE66MJpz6cfFNvSa6xQiR9X6bUgwAL/FTD Message-ID: <496565EC904933469F292DDA3F1663E602F10ED4B1@dlee06.ent.ti.com> References: <1277943660-4112-7-git-send-email-x0095840@ti.com> <1277943660-4112-8-git-send-email-x0095840@ti.com> <1277943660-4112-9-git-send-email-x0095840@ti.com>,<20100826155416J.fujita.tomonori@lab.ntt.co.jp> In-Reply-To: <20100826155416J.fujita.tomonori@lab.ntt.co.jp> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1258 Lines: 31 Hi Fujita, ________________________________________ >From: FUJITA Tomonori [fujita.tomonori@lab.ntt.co.jp] >Sent: Thursday, August 26, 2010 1:55 AM >To: Guzman Lugo, Fernando >Cc: linux-omap@vger.kernel.org; linux-kernel@vger.kernel.org; ohad@wizery.com; hiroshi.doyu@nokia.com; ameya.palande@nokia.com; felipe.contreras@nokia.com >Subject: Re: [PATCH 8/9] dspbridge: add map support for big buffers > >On Wed, 30 Jun 2010 19:20:59 -0500 >Fernando Guzman Lugo wrote: > >> due to a restriction in scatter gather lists, it can >> not be created a list for a buffer bigger than 1MB. >> This patch is spliting big mappings into 1MB mappings. > >I don't read the whole thread but the above description is incorrect. > >Why can't you use scatter gather chaining? You can create a scatter >list for a buffer larger than 1MB. The thing is that ARM architecture does not support SG chaining. This patch should be seen like a workaround until it is fixed in iovmm module. Thanks and regards, Fernando. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/