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From: Oscar Salvador <osalvador@suse.de>
To: Mike Rapoport <rppt@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Baoquan He <bhe@redhat.com>, Borislav Petkov <bp@alien8.de>,
	David Hildenbrand <david@redhat.com>,
	"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
	Mel Gorman <mgorman@suse.de>, Michal Hocko <mhocko@kernel.org>,
	Mike Rapoport <rppt@linux.ibm.com>, Qian Cai <cai@lca.pw>,
	Thomas Gleixner <tglx@linutronix.de>,
	Vlastimil Babka <vbabka@suse.cz>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org
Subject: Re: [PATCH v3 1/2] x86/setup: don't remove E820_TYPE_RAM for pfn 0
Date: Wed, 13 Jan 2021 09:56:49 +0100
Message-ID: <20210113085644.GA24816@linux> (raw)
In-Reply-To: <20210111194017.22696-2-rppt@kernel.org>

On Mon, Jan 11, 2021 at 09:40:16PM +0200, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@linux.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

  reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-11 19:40 [PATCH v3 0/2] mm: fix initialization of struct page for holes in memory layout Mike Rapoport
2021-01-11 19:40 ` [PATCH v3 1/2] x86/setup: don't remove E820_TYPE_RAM for pfn 0 Mike Rapoport
2021-01-13  8:56   ` Oscar Salvador [this message]
2021-01-13 11:23     ` Mike Rapoport
2021-01-13 12:56   ` David Hildenbrand
2021-01-13 15:35     ` Mike Rapoport
2021-01-21 13:25   ` Borislav Petkov
2021-01-11 19:40 ` [PATCH v3 2/2] mm: fix initialization of struct page for holes in memory layout Mike Rapoport
2021-02-01  9:14   ` David Hildenbrand
2021-02-01  9:39     ` Baoquan He
2021-02-01 14:12       ` Mike Rapoport
2021-01-12  0:58 ` [PATCH v3 0/2] " Andrew Morton
2021-01-12  5:25   ` Mike Rapoport

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