From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1852DC38A2A for ; Thu, 7 May 2020 13:43:13 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C32572082E for ; Thu, 7 May 2020 13:43:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="lDaxFR4k" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C32572082E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=DDQZu4HSK8B+UWPSpbYYWHXUnaUeu4WZBtfsQSoBR6M=; b=lDaxFR4kb80Bxk JTYip65uhioYzYqDqhkov7MBfyjgthPAye45Y7klpNDxRBpFpF9etE/V9HAnJeCYMeGCKSx8Phi2D T4mvhTh5qaUPRNKlrCSmBKLE6/g88DFKz7QS9GIidDuwcssoO6PVbKz2dfaDhlI3zrcd/pP7i1Yx+ +nIAHX1Do6FmFzupIU/W+wAcJZSH9+V28FsLkwJ+KYUErI98ezvxt+TvGrHg6oontNZETRpxYCRUp wNjOMYy54u0V3rQC1vinj+zPNriQJbkVDWxjCk20C1Alp26bzMdy7nhP1StPLvJ36VG/UskYW0nRF xtYR1oVQG4SPzb+L4ZjQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jWgnt-0006oS-Bd; Thu, 07 May 2020 13:43:09 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jWgnq-0006nj-UT for linux-arm-kernel@lists.infradead.org; Thu, 07 May 2020 13:43:08 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 84614D6E; Thu, 7 May 2020 06:43:03 -0700 (PDT) Received: from gaia (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id A5E993F68F; Thu, 7 May 2020 06:43:02 -0700 (PDT) Date: Thu, 7 May 2020 14:43:00 +0100 From: Catalin Marinas To: Will Deacon Subject: Re: [RFC PATCH] arm64: remove CONFIG_DEBUG_ALIGN_RODATA feature Message-ID: <20200507134259.GA3180@gaia> References: <20200329141258.31172-1-ardb@kernel.org> <20200330135121.GD10633@willie-the-truck> <20200330140441.GE10633@willie-the-truck> <20200330142805.GA11312@willie-the-truck> <20200402113033.GD21087@mbp> <20200505104404.GB19710@willie-the-truck> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200505104404.GB19710@willie-the-truck> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200507_064307_025695_59B58124 X-CRM114-Status: UNSURE ( 8.58 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Ard Biesheuvel , Linux ARM , kernel-hardening@lists.openwall.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, May 05, 2020 at 11:44:06AM +0100, Will Deacon wrote: > Catalin -- did you get anything back from the architects about the cache > hit behaviour? Any read from a non-cacheable alias would be coherent with writes using the same non-cacheable attributes, irrespective of other cacheable aliases (of course, subject to the cache lines having been previously cleaned/invalidated to avoid dirty lines evictions). So as long as the hardware works as per the ARM ARM (B2.8), we don't need to unmap the non-cacheable DMA buffers from the linear map. -- Catalin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel