linux-kernel - [PATCH RFC 0/2] mm/memory_hotplug: handle memblocks only with CONFIG_ARCH_KEEP

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Message-Id: <20200416104707.20219-1-david@redhat.com>
Date:   Thu, 16 Apr 2020 12:47:05 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Baoquan He <bhe@...hat.com>, Michal Hocko <mhocko@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Oscar Salvador <osalvador@...e.de>,
        Pankaj Gupta <pankaj.gupta.linux@...il.com>
Subject: [PATCH RFC 0/2] mm/memory_hotplug: handle memblocks only with CONFIG_ARCH_KEEP_MEMBLOCK

While working on some other cleanups I stumbled over the creation/removal
of memblocks in hotplug code and wondered why we still need that. Turns
out, we only need that handling with CONFIG_ARCH_KEEP_MEMBLOCK - unless
I am missing something important (-> RFC).

I'll be sending out patches to remove CONFIG_ARCH_KEEP_MEMBLOCK on s390x
soonish, after finding a way to test them.

Gave it a quick test on x86-64.

David Hildenbrand (2):
  mm/memory_hotplug: no need to init new pgdat with node_start_pfn
  mm/memory_hotplug: handle memblocks only with
    CONFIG_ARCH_KEEP_MEMBLOCK

 mm/Kconfig          |  3 +++
 mm/memory_hotplug.c | 28 +++++++++++++---------------
 2 files changed, 16 insertions(+), 15 deletions(-)

-- 
2.25.1