Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755384Ab1D1I1u (ORCPT ); Thu, 28 Apr 2011 04:27:50 -0400 Received: from service87.mimecast.com ([94.185.240.25]:53518 "HELO service87.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1754618Ab1D1I1s convert rfc822-to-8bit (ORCPT ); Thu, 28 Apr 2011 04:27:48 -0400 Subject: Re: [RFC] ARM DMA mapping TODO, v1 From: Catalin Marinas To: Valdis.Kletnieks@vt.edu Cc: Arnd Bergmann , linaro-mm-sig@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org In-Reply-To: <11431.1303949729@localhost> References: <201104212129.17013.arnd@arndb.de> <201104271243.16868.arnd@arndb.de> <1303902508.15101.21.camel@e102109-lin.cambridge.arm.com> <11431.1303949729@localhost> Organization: ARM Limited Date: Thu, 28 Apr 2011 09:27:39 +0100 Message-ID: <1303979259.26744.3.camel@e102109-lin.cambridge.arm.com> Mime-Version: 1.0 X-Mailer: Evolution 2.28.1 X-OriginalArrivalTime: 28 Apr 2011 08:27:40.0230 (UTC) FILETIME=[233FBE60:01CC057E] X-MC-Unique: 111042809274403501 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 854 Lines: 23 On Thu, 2011-04-28 at 01:15 +0100, Valdis.Kletnieks@vt.edu wrote: > On Wed, 27 Apr 2011 12:08:28 BST, Catalin Marinas said: > > > The current version of the ARM ARM says "unpredictable". But this > > general definition of "unpredictable" does not allow it to deadlock > > (hardware) or have security implications. It is however allowed to > > corrupt data. > > Not allowed to have security implications, but is allowed to corrupt data. By security I was referring to TrustZone extensions. IOW, unpredictable in normal (non-secure) world should not cause data corruption in the secure world. -- Catalin -- 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/