From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 40Kb714xlQzDr3y for ; Tue, 10 Apr 2018 02:17:33 +1000 (AEST) Received: from pps.filterd (m0098417.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w39GG3iT022226 for ; Mon, 9 Apr 2018 12:17:31 -0400 Received: from e06smtp14.uk.ibm.com (e06smtp14.uk.ibm.com [195.75.94.110]) by mx0a-001b2d01.pphosted.com with ESMTP id 2h8au729j5-1 (version=TLSv1.2 cipher=AES256-SHA256 bits=256 verify=NOT) for ; Mon, 09 Apr 2018 12:17:30 -0400 Received: from localhost by e06smtp14.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 9 Apr 2018 17:17:27 +0100 Subject: Re: [PATCH 0/3] move __HAVE_ARCH_PTE_SPECIAL in Kconfig To: Vineet Gupta , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "linuxppc-dev@lists.ozlabs.org" , "x86@kernel.org" , "linux-doc@vger.kernel.org" , "linux-snps-arc@lists.infradead.org" , "linux-arm-kernel@lists.infradead.org" , "linux-riscv@lists.infradead.org" , "linux-s390@vger.kernel.org" , "linux-sh@vger.kernel.org" , "sparclinux@vger.kernel.org" , Jerome Glisse , "mhocko@kernel.org" , "aneesh.kumar@linux.vnet.ibm.com" , "akpm@linux-foundation.org" , "mpe@ellerman.id.au" , "benh@kernel.crashing.org" , "paulus@samba.org" , Jonathan Corbet , Catalin Marinas , Will Deacon , Yoshinori Sato , Rich Felker , "David S . Miller" , Thomas Gleixner , Ingo Molnar , Palmer Dabbelt , Albert Ou , Martin Schwidefsky , Heiko Carstens References: <1523282229-20731-1-git-send-email-ldufour@linux.vnet.ibm.com> <17b19aac-fed7-23a2-013c-43ca867152e9@synopsys.com> From: Laurent Dufour Date: Mon, 9 Apr 2018 18:17:16 +0200 MIME-Version: 1.0 In-Reply-To: <17b19aac-fed7-23a2-013c-43ca867152e9@synopsys.com> Content-Type: text/plain; charset=utf-8 Message-Id: <21c34965-ec30-4d7f-aeaf-cb3da9758a0e@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On 09/04/2018 18:03, Vineet Gupta wrote: > On 04/09/2018 06:57 AM, Laurent Dufour wrote: >> The per architecture __HAVE_ARCH_PTE_SPECIAL is defined statically in the >> per architecture header files. This doesn't allow to make other >> configuration dependent on it. > > So I understand this series has more "readability" value and I'm fine with this > change but I wonder if you really would want to make something depend on it or > make this de-configurable. PTE special is really a fundamental construct - e.g. > it is used for anon mapped pages where zero page has been wired up etc... I don't want it to be de-configurable. This is almost like ARCH_SUPPORTS_MEMORY_FAILURE, ARCH_USES_HIGH_VMA_FLAGS, ARCH_HAS_HMM... These values are selected by per architecture Kconfig files and are not exposed through the configuration menu. Concerning making something depend on it, I will probably make CONFIG_SPECULATIVE_PAGE_FAULT introduced by the SPF series dependent on it. For details, please see https://lkml.org/lkml/2018/3/13/1143 Thanks, Laurent.