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Date: Fri, 19 Jul 2019 08:06:10 +0200
From: Michal Hocko <mhocko@kernel.org>
To: David Hildenbrand <david@redhat.com>
Subject: Re: [PATCH v3 06/11] mm/memory_hotplug: Allow arch_remove_pages()
 without CONFIG_MEMORY_HOTREMOVE
Message-ID: <20190719060610.GH30461@dhcp22.suse.cz>
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Cc: Oscar Salvador <osalvador@suse.com>, Rich Felker <dalias@libc.org>,
 linux-ia64@vger.kernel.org, Anshuman Khandual <anshuman.khandual@arm.com>,
 linux-sh@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
 Dave Hansen <dave.hansen@linux.intel.com>,
 Heiko Carstens <heiko.carstens@de.ibm.com>,
 Wei Yang <richard.weiyang@gmail.com>, linux-mm@kvack.org,
 Arun KS <arunks@codeaurora.org>, Paul Mackerras <paulus@samba.org>,
 "H. Peter Anvin" <hpa@zytor.com>, Thomas Gleixner <tglx@linutronix.de>,
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 Yoshinori Sato <ysato@users.sourceforge.jp>,
 "Rafael J. Wysocki" <rafael@kernel.org>, Mike Rapoport <rppt@linux.ibm.com>,
 Ingo Molnar <mingo@redhat.com>, Fenghua Yu <fenghua.yu@intel.com>,
 Pavel Tatashin <pasha.tatashin@soleen.com>, Vasily Gorbik <gor@linux.ibm.com>,
 Rob Herring <robh@kernel.org>, "mike.travis@hpe.com" <mike.travis@hpe.com>,
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 Mark Brown <broonie@kernel.org>, Borislav Petkov <bp@alien8.de>,
 Andy Lutomirski <luto@kernel.org>, Dan Williams <dan.j.williams@intel.com>,
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 Tony Luck <tony.luck@intel.com>, Baoquan He <bhe@redhat.com>,
 Masahiro Yamada <yamada.masahiro@socionext.com>,
 Mathieu Malaterre <malat@debian.org>,
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On Mon 15-07-19 12:54:20, David Hildenbrand wrote:
[...]
> So I'm leaving it like it is. arch_remove_memory() will be mandatory for
> architectures implementing arch_add_memory().

I do agree that removing CONFIG_MEMORY_HOTREMOVE makes some sense. But
this patch being a mid step should be simpler rather than going half way
to get there. I would have liked the above for the purpose of this patch
more and then go with another one to remove the config altogether. But
Andrew has already sent his patch bomb including this series to Linus so
this is all moot.
-- 
Michal Hocko
SUSE Labs