linux-kernel - Re: [PATCH -mm 0/4] x86_64 boot: Add linked listof struct setup

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Date:	Thu, 27 Mar 2008 09:32:21 +0100
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
Subject: Re: [PATCH -mm 0/4] x86_64 boot: Add linked listof struct
	setup_data to boot protocol


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

> This patchset adds the linked list of struct setup_data to boot 
> protocol. This is needed by EDD information and some SGI machine with 
> E820 entry number > 128.

what happens with the SGI machine - does it crash (because we overflow 
the e820 array) - or does it boot up with less memory available and we 
get this bootup warning:

    Ooops! Too many entries in the memory map!

?

I guess we should we raise E820MAX from 128 to 256 (patch below), but if 
we do something worse (crash), we should fix that side-effect as well.

> Now, only the x86_64 is supported. The i386 can be supported after 
> early reservation mechanism for x86 is available.

could you try to do that nevertheless? We generally prefer feature 
patches after sensible unification has been done.

	Ingo

-------------->
Subject: x86: more e820
From: Ingo Molnar <mingo@...e.hu>
Date: Thu Mar 27 09:18:44 CET 2008

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 include/asm-x86/e820.h |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Index: linux-x86.q/include/asm-x86/e820.h
===================================================================
--- linux-x86.q.orig/include/asm-x86/e820.h
+++ linux-x86.q/include/asm-x86/e820.h
@@ -1,8 +1,9 @@
 #ifndef __ASM_E820_H
 #define __ASM_E820_H
-#define E820MAP	0x2d0		/* our map */
-#define E820MAX	128		/* number of entries in E820MAP */
-#define E820NR	0x1e8		/* # entries in E820MAP */
+
+#define E820MAP		0x2d0		/* our map */
+#define E820MAX		256		/* number of entries in E820MAP */
+#define E820NR		0x1e8		/* # entries in E820MAP */
 
 #define E820_RAM	1
 #define E820_RESERVED	2
--
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