linux-kernel - Re: [PATCH v7 7/8] x86/Kconfig: Introduce ARCH_MHP_MEMMAP_ON_MEMORY

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Date:   Thu, 8 Apr 2021 20:19:32 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>,
        Oscar Salvador <osalvador@...e.de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 7/8] x86/Kconfig: Introduce
 ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE

On 08.04.21 15:36, Christoph Hellwig wrote:
> On Thu, Apr 08, 2021 at 02:18:03PM +0200, Oscar Salvador wrote:
>> Enable x86_64 platform to use the MHP_MEMMAP_ON_MEMORY feature.
>> +config ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
>> +	def_bool y
> 
> This needs to go into a common file, with the architectures just
> selecting the symbol.
> 

I'd like to point out that we have plenty of counter examples. Meaning: 
it's really hard to figure out what the correct way is. Unfortunately, 
the correct way also doesn't seem to be documented :(

-- 
Thanks,

David / dhildenb