Re: [PATCH v3 1/2] x86/setup: don't remove E820_TYPE_RAM for pfn 0

Oscar Salvador
2021-01-13T08:57:50Z

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