linux-kernel - Re: [PATCH] x86 boot: Pass E820 memory map entries more than 128 via linked list of setup data

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Date:	Wed, 18 Jun 2008 13:45:11 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Huang, Ying" <ying.huang@...el.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, andi@...stfloor.org,
	mingo@...hat.com, tglx@...utronix.de, Paul Jackson <pj@....com>,
	linux-kernel@...r.kernel.org, Yinghai Lu <yhlu.kernel@...il.com>
Subject: Re: [PATCH] x86 boot: Pass E820 memory map entries more than 128
	via linked list of setup data


* Huang, Ying <ying.huang@...el.com> wrote:

> Because of the size limits of struct boot_params (zero page), the 
> maximum number of E820 memory map entries can be passed to kernel is 
> 128. As pointed by Paul Jackson, there is some machine produced by SGI 
> with so many nodes that the number of E820 memory map entries is more 
> than 128. To enabling Linux kernel on these system, a new setup data 
> type named SETUP_E820_EXT is defined to pass additional memory map 
> entries to Linux kernel.
> 
> This patch is based on x86/auto-latest branch of git-x86 tree and has 
> been tested on x86_64 and i386 platform.

applied to tip/x86/mpparse, thanks.

this bit collided with a recent change:

> -	do {
> -		u64 start = biosmap->addr;
> -		u64 size = biosmap->size;
> -		u64 end = start + size;
> -		u32 type = biosmap->type;
> -
> -		/* Overflow in 64 bits? Ignore the memory map. */
> -		if (start > end)
> -			return -1;
> -
> -		add_memory_region(start, size, type);
> -	} while (biosmap++, --nr_map);
> -	return 0;
> +	return __copy_e820_map(biosmap, nr_map);

because add_memory_region() got renamed to e820_add_region(). I did the 
obvious fixup.

	Ingo
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