From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-2.mimecast.com ([205.139.110.61]:36723 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1731504AbgGAOSn (ORCPT ); Wed, 1 Jul 2020 10:18:43 -0400 From: David Hildenbrand Subject: [PATCH v2 0/2] s390/mm: don't set ARCH_KEEP_MEMBLOCK Date: Wed, 1 Jul 2020 16:18:28 +0200 Message-Id: <20200701141830.18749-1-david@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-s390-owner@vger.kernel.org List-ID: To: linux-kernel@vger.kernel.org Cc: linux-s390@vger.kernel.org, linux-mm@kvack.org, David Hildenbrand , Andrew Morton , Christian Borntraeger , Heiko Carstens , Michael Holzheu , Mike Rapoport , Philipp Rudo , Vasily Gorbik This series is based on the latest s390/features branch, which contains "s390/zcore: remove memmap device". [1] Looking into why we still create memblocks for stdnaby/hotplugged memory (via add_memory()), I discovered that we might not need ARCH_KEEP_MEMBLOCK on s390x after all. This is relevant in the context of virtio-mem, where we hotplug a lot of small memory blocks (and want to avoid managing unused metadata). But also for existing setups, it might help to free up some memory after boot. Compile-tested on s390x, pseries, arm64, i386, mips64, powernv, sh, and x86_64. [1] https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features v1 -> v2: - "mm/memblock: expose only miminal interface to add/walk physmem" -- Use inline function for __next_physmem_range -- Rewrite some comments RFC -> v1: - "s390/zcore: traverse resources instead of memblocks" has been replaced on s390/features by "s390/zcore: remove memmap devic" - Add "mm/memblock: expose only miminal interface to add/walk physmem" -- Sort out section mismatch errors when using physmem after boot without ARCH_KEEP_MEMBLOCK - "s390/mm: don't set ARCH_KEEP_MEMBLOCK" -- Rephrase description David Hildenbrand (2): mm/memblock: expose only miminal interface to add/walk physmem s390/mm: don't set ARCH_KEEP_MEMBLOCK arch/s390/Kconfig | 1 - arch/s390/kernel/crash_dump.c | 6 ++-- include/linux/memblock.h | 28 ++++++++++++++--- mm/memblock.c | 57 ++++++++++++++++++----------------- 4 files changed, 55 insertions(+), 37 deletions(-) -- 2.26.2