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Message-ID: <20210113085644.GA24816@linux>
Date: Wed, 13 Jan 2021 09:56:49 +0100
From: Oscar Salvador <osalvador@...e.de>
To: Mike Rapoport <rppt@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Andrea Arcangeli <aarcange@...hat.com>,
Baoquan He <bhe@...hat.com>, Borislav Petkov <bp@...en8.de>,
David Hildenbrand <david@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...nel.org>,
Mike Rapoport <rppt@...ux.ibm.com>, Qian Cai <cai@....pw>,
Thomas Gleixner <tglx@...utronix.de>,
Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, x86@...nel.org
Subject: Re: [PATCH v3 1/2] x86/setup: don't remove E820_TYPE_RAM for pfn 0
On Mon, Jan 11, 2021 at 09:40:16PM +0200, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@...ux.ibm.com>
>
> The first 4Kb of memory is a BIOS owned area and to avoid its allocation
> for the kernel it was not listed in e820 tables as memory. As the result,
> pfn 0 was never recognised by the generic memory management and it is not a
> part of neither node 0 nor ZONE_DMA.
So, since it never was added to memblock.memory structs, it was not
initialized by init_unavailable_mem, right?
--
Oscar Salvador
SUSE L3
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