From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (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 3vMzwb2nn1zDqM0 for ; Tue, 14 Feb 2017 22:00:30 +1100 (AEDT) Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v1EAwiEO053391 for ; Tue, 14 Feb 2017 06:00:28 -0500 Received: from e23smtp06.au.ibm.com (e23smtp06.au.ibm.com [202.81.31.148]) by mx0a-001b2d01.pphosted.com with ESMTP id 28kgdkw5ce-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 14 Feb 2017 06:00:27 -0500 Received: from localhost by e23smtp06.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 14 Feb 2017 21:00:25 +1000 Received: from d23relay07.au.ibm.com (d23relay07.au.ibm.com [9.190.26.37]) by d23dlp03.au.ibm.com (Postfix) with ESMTP id 56A203578052 for ; Tue, 14 Feb 2017 22:00:23 +1100 (EST) Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay07.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v1EB0F7t31719564 for ; Tue, 14 Feb 2017 22:00:23 +1100 Received: from d23av01.au.ibm.com (localhost [127.0.0.1]) by d23av01.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id v1EAxo1p017792 for ; Tue, 14 Feb 2017 21:59:51 +1100 From: Michael Ellerman To: "Aneesh Kumar K.V" , akpm@linux-foundation.org, Rik van Riel , Mel Gorman , paulus@ozlabs.org, benh@kernel.crashing.org Cc: linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH V2 1/2] mm/autonuma: Let architecture override how the write bit should be stashed in a protnone pte. In-Reply-To: References: <1487050314-3892-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> <1487050314-3892-2-git-send-email-aneesh.kumar@linux.vnet.ibm.com> <87poilmien.fsf@concordia.ellerman.id.au> Date: Tue, 14 Feb 2017 21:59:23 +1100 MIME-Version: 1.0 Content-Type: text/plain Message-Id: <874lzxm41g.fsf@concordia.ellerman.id.au> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , "Aneesh Kumar K.V" writes: > On Tuesday 14 February 2017 11:19 AM, Michael Ellerman wrote: >> "Aneesh Kumar K.V" writes: >> >>> Autonuma preserves the write permission across numa fault to avoid taking >>> a writefault after a numa fault (Commit: b191f9b106ea " mm: numa: preserve PTE >>> write permissions across a NUMA hinting fault"). Architecture can implement >>> protnone in different ways and some may choose to implement that by clearing Read/ >>> Write/Exec bit of pte. Setting the write bit on such pte can result in wrong >>> behaviour. Fix this up by allowing arch to override how to save the write bit >>> on a protnone pte. >> This is pretty obviously a nop on arches that don't implement the new >> hooks, but it'd still be good to get an ack from someone in mm land >> before I merge it. > > > To get it apply cleanly you may need > http://ozlabs.org/~akpm/mmots/broken-out/mm-autonuma-dont-use-set_pte_at-when-updating-protnone-ptes.patch > http://ozlabs.org/~akpm/mmots/broken-out/mm-autonuma-dont-use-set_pte_at-when-updating-protnone-ptes-fix.patch Ah OK, I missed those. In that case these two should probably go via Andrew's tree. cheers