Re: [PATCH] x86: use add_highpages_with_active_regions for high pages init

H. Peter Anvin
2008-06-16T05:39:49Z

Huang, Ying wrote:
> On Sun, 2008-06-15 at 20:46 -0700, Yinghai Lu wrote:
> [...]
>> don't need,
>> EFI memmap should be reserved in e820map, so it should not show up in
>> early_node_map.
>
> I don't think so. EFI memmap comes from boot-loader not from BIOS. It
> contains boot-loader execution information (such as EfiLoaderCode,
> EfiLoaderData, etc), and it will be located at different position for
> each system reboot.
>
> If it is reserved in E820 memmap, hibernation can not work. Because the
> memory area for EFI memmap is not E820 RAM, it is not saved during
> hibernating and restored after restoring from disk.
>
> Linked list of struct setup_data has similar requirement too.
>

That doesn't mean we can't use the E820 memory map structure for it. We
just have to define a new kernel-internal memory type, instead of using
type 2 (reserved).

-hpa