linux-kernel - Re: [RFC/RFT PATCH 1/3] memblock: update initialization of reserved pages

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Message-ID: <f5503130-c0e7-329f-86c4-727ece1c860f@redhat.com>
Date:   Thu, 15 Apr 2021 11:30:12 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Ard Biesheuvel <ardb@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Will Deacon <will@...nel.org>,
        kvmarm <kvmarm@...ts.cs.columbia.edu>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [RFC/RFT PATCH 1/3] memblock: update initialization of reserved
 pages

> Not sure we really need a new pagetype here, PG_Reserved seems to be quite
> enough to say "don't touch this".  I generally agree that we could make
> PG_Reserved a PageType and then have several sub-types for reserved memory.
> This definitely will add clarity but I'm not sure that this justifies
> amount of churn and effort required to audit uses of PageResrved().
>   
>> Then, we could mostly avoid having to query memblock at runtime to figure
>> out that this is special memory. This would obviously be an extension to
>> this series. Just a thought.
> 
> Stop pushing memblock out of kernel! ;-)

Can't stop. Won't stop. :D

It's lovely for booting up a kernel until we have other data-structures 
in place ;)


-- 
Thanks,

David / dhildenb