linux-kernel - Re: [PATCH] x86: use add_highpages_with_active

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Message-Id: <1213595126.10376.27.camel@caritas-dev.intel.com>
Date:	Mon, 16 Jun 2008 13:45:26 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Yinghai Lu <yhlu.kernel@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: use add_highpages_with_active_regions for
	high	pages init

On Sun, 2008-06-15 at 22:38 -0700, H. Peter Anvin wrote:
> 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).

Yes. I will do this.

Best Regards,
Huang Ying

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