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

Yinghai Lu
2013-01-14T19:04:39Z

On Mon, Jan 14, 2013 at 7:05 AM, Thomas Renninger <trenn@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.