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

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Date:	Mon, 14 Jan 2013 11:04:36 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Renninger <trenn@...e.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	MUNEDA Takahiro <muneda.takahiro@...fujitsu.com>,
	Takao Indoh <indou.takao@...fujitsu.com>,
	linux-pci@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, andi@...stfloor.org,
	tokunaga.keiich@...fujitsu.com, kexec@...ts.infradead.org,
	hbabu@...ibm.com, mingo@...hat.com, ddutile@...hat.com,
	vgoyal@...hat.com, ishii.hironobu@...fujitsu.com,
	bhelgaas@...gle.com, tglx@...utronix.de, khalid@...ehiking.org,
	horms@...ge.net.au
Subject: Re: [PATCH] x86 e820: only void usable memory areas in
 memmap=exactmap case

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