From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from caramon.arm.linux.org.uk ([78.32.30.218]:40330 "EHLO caramon.arm.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S966403Ab0GSSld (ORCPT ); Mon, 19 Jul 2010 14:41:33 -0400 Date: Mon, 19 Jul 2010 19:40:02 +0100 From: Russell King - ARM Linux Subject: Re: [RFC 1/3 v3] mm: iommu: An API to unify IOMMU, CPU and device memory management Message-ID: <20100719184002.GA21608@n2100.arm.linux.org.uk> References: <20100713150311B.fujita.tomonori@lab.ntt.co.jp> <20100713121420.GB4263@codeaurora.org> <20100714104353B.fujita.tomonori@lab.ntt.co.jp> <20100714201149.GA14008@codeaurora.org> <20100714220536.GE18138@n2100.arm.linux.org.uk> <20100715012958.GB2239@codeaurora.org> <20100715085535.GC26212@n2100.arm.linux.org.uk> <20100716075856.GC16124@n2100.arm.linux.org.uk> <4C449183.20000@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4C449183.20000@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org List-ID: To: Michael Bohan Cc: Tim HRM , Zach Pfeffer , FUJITA Tomonori , ebiederm@xmission.com, linux-arch@vger.kernel.org, dwalker@codeaurora.org, mel@csn.ul.ie, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, andi@firstfloor.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org On Mon, Jul 19, 2010 at 10:55:15AM -0700, Michael Bohan wrote: > > On 7/16/2010 12:58 AM, Russell King - ARM Linux wrote: > >> As the patch has been out for RFC since early April on the linux-arm-kernel >> mailing list (Subject: [RFC] Prohibit ioremap() on kernel managed RAM), >> and no comments have come back from Qualcomm folk. > > Would it be unreasonable to allow a map request to succeed if the > requested attributes matched that of the preexisting mapping? What would be the point of creating such a mapping?