Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758591Ab0KQRap (ORCPT ); Wed, 17 Nov 2010 12:30:45 -0500 Received: from cam-admin0.cambridge.arm.com ([217.140.96.50]:36338 "EHLO cam-admin0.cambridge.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758291Ab0KQRao (ORCPT ); Wed, 17 Nov 2010 12:30:44 -0500 Subject: Re: [PATCH v2 05/20] ARM: LPAE: Introduce L_PTE_NOEXEC and L_PTE_NOWRITE From: Catalin Marinas To: Russell King - ARM Linux Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org In-Reply-To: <20101117172425.GE5308@n2100.arm.linux.org.uk> References: <1289584840-18097-1-git-send-email-catalin.marinas@arm.com> <1289584840-18097-6-git-send-email-catalin.marinas@arm.com> <20101115183014.GD31421@n2100.arm.linux.org.uk> <20101117171613.GB5308@n2100.arm.linux.org.uk> <20101117172425.GE5308@n2100.arm.linux.org.uk> Content-Type: text/plain; charset="UTF-8" Organization: ARM Limited Date: Wed, 17 Nov 2010 17:30:33 +0000 Message-ID: <1290015033.2351.69.camel@e102109-lin.cambridge.arm.com> Mime-Version: 1.0 X-Mailer: Evolution 2.28.1 Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 17 Nov 2010 17:30:33.0751 (UTC) FILETIME=[23A91A70:01CB867D] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1130 Lines: 29 On Wed, 2010-11-17 at 17:24 +0000, Russell King - ARM Linux wrote: > On Wed, Nov 17, 2010 at 05:22:12PM +0000, Catalin Marinas wrote: > > Ah, good point, that was the mask. > > > > So for dmacoherent we make sure that L_PTE_EXEC is cleared. I suspect > > we should now make sure that L_PTE_NOEXEC is set. For the other two, > > just leave them as they are. > > Already done: > > #define pgprot_dmacoherent(prot) \ > - __pgprot_modify(prot, L_PTE_MT_MASK|L_PTE_EXEC, L_PTE_MT_BUFFERABLE) > + __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE|L_PTE_XN) > ... > #define pgprot_dmacoherent(prot) \ > - __pgprot_modify(prot, L_PTE_MT_MASK|L_PTE_EXEC, L_PTE_MT_UNCACHED) > + __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED|L_PTE_XN) Are you already doing such changes? Just to avoid duplicating effort (and use common naming scheme). -- 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/