linux-kernel - Re: [PATCH V5 0/3] arm64/mm: Enable memory hot remove

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Date:   Thu, 30 May 2019 09:23:03 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Anshuman Khandual <anshuman.khandual@....com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, catalin.marinas@....com,
        will.deacon@....com, mark.rutland@....com, mhocko@...e.com,
        ira.weiny@...el.com, cai@....pw, logang@...tatee.com,
        james.morse@....com, cpandya@...eaurora.org, arunks@...eaurora.org,
        dan.j.williams@...el.com, mgorman@...hsingularity.net,
        osalvador@...e.de, ard.biesheuvel@....com
Subject: Re: [PATCH V5 0/3] arm64/mm: Enable memory hot remove

On 30.05.19 06:23, Anshuman Khandual wrote:
> 
> 
> On 05/30/2019 03:36 AM, Andrew Morton wrote:
>> On Wed, 29 May 2019 14:46:24 +0530 Anshuman Khandual <anshuman.khandual@....com> wrote:
>>
>>> This series enables memory hot remove on arm64 after fixing a memblock
>>> removal ordering problem in generic __remove_memory() and one possible
>>> arm64 platform specific kernel page table race condition. This series
>>> is based on latest v5.2-rc2 tag.
>>
>> Unfortunately this series clashes syntactically and semantically with
>> David Hildenbrand's series "mm/memory_hotplug: Factor out memory block
>> devicehandling".  Could you and David please figure out what we should
>> do here?
>>
> 
> Hello Andrew,
> 
> I was able to apply the above mentioned V3 series [1] from David with some changes
> listed below which tests positively on arm64. These changes assume that the arm64
> hot-remove series (current V5) gets applied first.
> 
> Changes to David's series
> 
> A) Please drop (https://patchwork.kernel.org/patch/10962565/) [v3,04/11]
> 
> 	- arch_remove_memory() is already being added through hot-remove series
> 
> B) Rebase (https://patchwork.kernel.org/patch/10962575/) [v3, 06/11]
> 
> 	- arm64 hot-remove series adds CONFIG_MEMORY_HOTREMOVE wrapper around
> 	  arch_remove_memory() which can be dropped in the rebased patch
> 
> C) Rebase (https://patchwork.kernel.org/patch/10962589/) [v3, 09/11]
> 
> 	- hot-remove series moves arch_remove_memory() before memblock_[free|remove]()
> 	- So remove_memory_block_devices() should be moved before arch_remove_memory()
> 	  in it's new position
> 
> David,
> 
> Please do let me know if the plan sounds good or you have some other suggestions.

That's exactly what I had in mind :)

Andrew, you can drop my series and pick up Anshumans series first. I can
then rebase and resend.
Cheers!

-- 

Thanks,

David / dhildenb