From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from down.free-electrons.com ([37.187.137.238]:40796 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752397AbbI3J2U (ORCPT ); Wed, 30 Sep 2015 05:28:20 -0400 From: Gregory CLEMENT To: Russell King - ARM Linux Cc: Catalin Marinas , Jason Cooper , Andrew Lunn , Sebastian Hesselbarth , Thomas Petazzoni , Ezequiel Garcia , linux-arm-kernel@lists.infradead.org, Maxime Ripard , Boris BREZILLON , Lior Amsalem , Tawfik Bayouk , Nadav Haklai , stable@vger.kernel.org Subject: Re: [PATCH v4 1/2] ARM: dma-mapping: Don't use outer_flush_range when the L2C is coherent References: <1443545458-14807-1-git-send-email-gregory.clement@free-electrons.com> <1443545458-14807-2-git-send-email-gregory.clement@free-electrons.com> <20150929171054.GN21513@n2100.arm.linux.org.uk> Date: Wed, 30 Sep 2015 11:28:07 +0200 In-Reply-To: <20150929171054.GN21513@n2100.arm.linux.org.uk> (Russell King's message of "Tue, 29 Sep 2015 18:10:54 +0100") Message-ID: <87fv1wqms8.fsf@free-electrons.com> MIME-Version: 1.0 Content-Type: text/plain Sender: stable-owner@vger.kernel.org List-ID: Hi Russell, On mar., sept. 29 2015, Russell King - ARM Linux wrote: > On Tue, Sep 29, 2015 at 06:50:57PM +0200, Gregory CLEMENT wrote: >> When a L2 cache controller is used in a system that provides hardware > > You're talking about L2 cache here, but you're also masking out the L1 > cache maintanence (dmac_*) too. It's my understanding that we don't > yet support coherency to L1 yet. Do you suggest to not masking the dmac_* operation ? Initially I tought that L1 and L2 cache maintanence operation were more or less linked but I might mix up. Thanks, Gregory -- Gregory Clement, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com