From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:19396 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731608AbgGAPcJ (ORCPT ); Wed, 1 Jul 2020 11:32:09 -0400 Date: Wed, 1 Jul 2020 17:31:57 +0200 From: Heiko Carstens Subject: Re: [PATCH v2 1/2] mm/memblock: expose only miminal interface to add/walk physmem Message-ID: <20200701153157.GC5008@osiris> References: <20200701141830.18749-1-david@redhat.com> <20200701141830.18749-2-david@redhat.com> <20200701150643.GA2999146@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200701150643.GA2999146@linux.ibm.com> Sender: linux-s390-owner@vger.kernel.org List-ID: To: Mike Rapoport Cc: David Hildenbrand , linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linux-mm@kvack.org, Vasily Gorbik , Christian Borntraeger , Andrew Morton On Wed, Jul 01, 2020 at 06:06:43PM +0300, Mike Rapoport wrote: > Hi David, > > On Wed, Jul 01, 2020 at 04:18:29PM +0200, David Hildenbrand wrote: > > "physmem" in the memblock allocator is somewhat weird: it's not actually > > used for allocation, it's simply information collected during boot, which > > describes the unmodified physical memory map at boot time, without any > > standby/hotplugged memory. It's only used on s390x and is currently the > > only reason s390x keeps using CONFIG_ARCH_KEEP_MEMBLOCK. > > > > Physmem isn't numa aware and current users don't specify any flags. Let's > > hide it from the user, exposing only for_each_physmem(), and simplify. The > > interface for physmem is now really minimalistic: > > - memblock_physmem_add() to add ranges > > - for_each_physmem() / __next_physmem_range() to walk physmem ranges > > > > Don't place it into an __init section and don't discard it without > > CONFIG_ARCH_KEEP_MEMBLOCK. As we're reusing __next_mem_range(), remove > > the __meminit notifier to avoid section mismatch warnings once > > CONFIG_ARCH_KEEP_MEMBLOCK is no longer used with > > CONFIG_HAVE_MEMBLOCK_PHYS_MAP. > > > > While fixing up the documentation, sneak in some related cleanups. We can > > stop setting CONFIG_HAVE_MEMBLOCK_PHYS_MAP for s390x next. > > As you noted in the previous version it should have been > CONFIG_ARCH_KEEP_MEMBLOCK ;-) > > > Cc: Heiko Carstens > > Cc: Vasily Gorbik > > Cc: Christian Borntraeger > > Cc: Mike Rapoport > > Cc: Andrew Morton > > Signed-off-by: David Hildenbrand > > Reviewed-by: Mike Rapoport > > > --- > > arch/s390/kernel/crash_dump.c | 6 ++-- > > include/linux/memblock.h | 28 ++++++++++++++--- > > mm/memblock.c | 57 ++++++++++++++++++----------------- > > 3 files changed, 55 insertions(+), 36 deletions(-) So I guess this should go via the s390 tree, since the second patch of this series can go only upstream if both this patch and a patch which is currently only on our features are merged before. Any objections?