From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by lists.ozlabs.org (Postfix) with ESMTP id 9CD551A0627 for ; Fri, 19 Feb 2016 12:28:29 +1100 (AEDT) Subject: Re: [PATCH V3 01/30] mm: Make vm_get_page_prot arch specific. To: "Aneesh Kumar K.V" , benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au References: <1455814254-10226-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> <1455814254-10226-2-git-send-email-aneesh.kumar@linux.vnet.ibm.com> Cc: linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org From: Dave Hansen Message-ID: <56C66FBB.7000808@intel.com> Date: Thu, 18 Feb 2016 17:28:27 -0800 MIME-Version: 1.0 In-Reply-To: <1455814254-10226-2-git-send-email-aneesh.kumar@linux.vnet.ibm.com> Content-Type: text/plain; charset=windows-1252 List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On 02/18/2016 08:50 AM, Aneesh Kumar K.V wrote: > With next generation power processor, we are having a new mmu model > [1] that require us to maintain a different linux page table format. > > Inorder to support both current and future ppc64 systems with a single > kernel we need to make sure kernel can select between different page > table format at runtime. With the new MMU (radix MMU) added, we will > have to dynamically switch between different protection map. Hence > override vm_get_page_prot instead of using arch_vm_get_page_prot. We > also drop arch_vm_get_page_prot since only powerpc used it. Hi Aneesh, I've got some patches I'm hoping to get in to 4.6 that start using arch_vm_get_page_prot() on x86: > http://git.kernel.org/cgit/linux/kernel/git/daveh/x86-pkeys.git/commit/?h=pkeys-v024&id=aa1e61398fb598869981cfe48275cff832945669 So I'd prefer that it stay in place. :)