From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f200.google.com (mail-pf0-f200.google.com [209.85.192.200]) by kanga.kvack.org (Postfix) with ESMTP id D83D76B04BF for ; Sun, 20 Nov 2016 21:09:02 -0500 (EST) Received: by mail-pf0-f200.google.com with SMTP id a8so198944203pfg.0 for ; Sun, 20 Nov 2016 18:09:02 -0800 (PST) Received: from mail-pg0-x244.google.com (mail-pg0-x244.google.com. [2607:f8b0:400e:c05::244]) by mx.google.com with ESMTPS id h24si19999380pfk.250.2016.11.20.18.09.01 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 20 Nov 2016 18:09:02 -0800 (PST) Received: by mail-pg0-x244.google.com with SMTP id e9so26606407pgc.1 for ; Sun, 20 Nov 2016 18:09:01 -0800 (PST) Subject: Re: [HMM v13 07/18] mm/ZONE_DEVICE/x86: add support for un-addressable device memory References: <1479493107-982-1-git-send-email-jglisse@redhat.com> <1479493107-982-8-git-send-email-jglisse@redhat.com> From: Balbir Singh Message-ID: <33e9c941-ac57-3dfd-2ed9-c1d058a57d8f@gmail.com> Date: Mon, 21 Nov 2016 13:08:56 +1100 MIME-Version: 1.0 In-Reply-To: <1479493107-982-8-git-send-email-jglisse@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: To: =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: John Hubbard , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" On 19/11/16 05:18, JA(C)rA'me Glisse wrote: > It does not need much, just skip populating kernel linear mapping > for range of un-addressable device memory (it is pick so that there > is no physical memory resource overlapping it). All the logic is in > share mm code. > > Only support x86-64 as this feature doesn't make much sense with > constrained virtual address space of 32bits architecture. > Is there a reason this would not work on powerpc64 for example? Could you document the limitations -- testing/APIs/missing features? Balbir Singh. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org