[PATCH] x86 e820: only void usable memory areas in memmap=exactmap case

[Yinghai Lu]

On Mon, Jan 14, 2013 at 7:05 AM, Thomas Renninger <trenn at suse.de> wrote:
> What is this for?:
> @@ -871,6 +879,11 @@ static int __init parse_memmap_one(char
>         userdef = 1;
>         if (*p == '@') {
>                 start_at = memparse(p+1, &p);
> +               if (exactusablemap_parsed) {
> +                       /* remove all range with other types */
> +                       e820_remove_range(start_at, mem_size,
> +                                                E820_RAM, 0);
> +               }
>                 e820_add_region(start_at, mem_size, E820_RAM);
>         } else if (*p == '#') {
>                 start_at = memparse(p+1, &p);

remove all old renges before add E820_RAM, otherwise new add E820
ranges could be ignored.