From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-f200.google.com (mail-wr0-f200.google.com [209.85.128.200]) by kanga.kvack.org (Postfix) with ESMTP id 35F316B0008 for ; Tue, 20 Feb 2018 11:16:16 -0500 (EST) Received: by mail-wr0-f200.google.com with SMTP id 30so8366722wrw.6 for ; Tue, 20 Feb 2018 08:16:16 -0800 (PST) Received: from mout.gmx.net (mout.gmx.net. [212.227.15.18]) by mx.google.com with ESMTPS id w63si4983010wma.74.2018.02.20.08.16.14 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 20 Feb 2018 08:16:14 -0800 (PST) From: =?UTF-8?q?Jonathan=20Neusch=C3=A4fer?= Subject: [PATCH 0/6] DISCONTIGMEM support for PPC32 Date: Tue, 20 Feb 2018 17:14:18 +0100 Message-Id: <20180220161424.5421-1-j.neuschaefer@gmx.net> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: To: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org, Michael Ellerman , linux-mm@kvack.org, Joel Stanley , =?UTF-8?q?Jonathan=20Neusch=C3=A4fer?= This patchset adds support for DISCONTIGMEM on 32-bit PowerPC. This is required to properly support the Nintendo Wii's memory layout, in which there are two blocks of RAM and MMIO in the middle. Previously, this memory layout was handled by code that joins the two RAM blocks into one, reserves the MMIO hole, and permits allocations of reserved memory in ioremap. This hack didn't work with resource-based allocation (as used for example in the GPIO driver for Wii[1]), however. After this patchset, users of the Wii can either select CONFIG_FLATMEM to get the old behaviour, or CONFIG_DISCONTIGMEM to get the new behaviour. Some parts of this patchset are probably not ideal (I'm thinking of my implementation of pfn_to_nid here), and will require some discussion/ changes. [1]: https://www.spinics.net/lists/devicetree/msg213956.html Jonathan NeuschA?fer (6): powerpc/mm/32: Use pfn_valid to check if pointer is in RAM powerpc: numa: Fix overshift on PPC32 powerpc: numa: Use the right #ifdef guards around functions powerpc: numa: Restrict fake NUMA enulation to CONFIG_NUMA systems powerpc: Implement DISCONTIGMEM and allow selection on PPC32 powerpc: wii: Don't rely on reserved memory hack if DISCONTIGMEM is set arch/powerpc/Kconfig | 5 ++++- arch/powerpc/include/asm/mmzone.h | 21 +++++++++++++++++++++ arch/powerpc/mm/numa.c | 18 +++++++++++++++--- arch/powerpc/mm/pgtable_32.c | 2 +- arch/powerpc/platforms/embedded6xx/wii.c | 10 +++++++--- 5 files changed, 48 insertions(+), 8 deletions(-) -- 2.16.1 -- 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