linux-kernel - Re: [PATCH 1/5] mm: Introduce ARCH_MHP_MEMMAP_ON_MEMORY

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Date:   Tue, 12 Jan 2021 11:12:30 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Oscar Salvador <osalvador@...e.de>
Cc:     akpm@...ux-foundation.org, mhocko@...nel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, vbabka@...e.cz,
        pasha.tatashin@...een.com
Subject: Re: [PATCH 1/5] mm: Introduce ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE

On 12.01.21 08:26, Oscar Salvador wrote:
> On Mon, Jan 11, 2021 at 05:52:19PM +0100, David Hildenbrand wrote:
>> On 17.12.20 14:07, Oscar Salvador wrote:
>>> In order to use self-hosted memmap array, the platform needs to have
>>> support for CONFIG_SPARSEMEM_VMEMMAP and altmap.
>>> Currently, only arm64, PPC and x86_64 have the support, so enable those
>>> platforms with ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE.
>>
>> "In the first version, only .... will support it".
> 
> I will try to be more specific.
> 
>>
>> I'd probably split off enabling it per architecture in separate patches
>> and the end of the series.
> 
> You mean introducing only mm/Kconfig change in this patch, and then
> arch/*/Kconfig changes in separate patches at the end of the series?

Yeah, or squashing the leftovers of this patch (3 LOC) into patch #2.

> 
> I can certainly do that, not sure how much will help with the review,
> but it might help when bisecting.

It's usually nicer to explicitly enable stuff per architecture, stating
why it works on that architecture (and in the best case, even was
tested!). :)

-- 
Thanks,

David / dhildenb