linux-kernel - [PATCH] x86: only put e820 ram entries in resource tree

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Date:	Sun, 24 Aug 2008 15:44:57 -0700
From:	Yinghai Lu <yhlu.kernel@...il.com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Yinghai Lu <yhlu.kernel@...il.com>,
	Bernhard Walle <bwalle@...e.de>,
	Vivek Goyal <vgoyal@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH] x86: only put e820 ram entries in resource tree

may need user to have new kexec tools that could create e820 table
from /sys/firmware/memmap instead of /proc/iomem for second kernel

Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
Cc: Bernhard Walle <bwalle@...e.de>
Cc: Vivek Goyal <vgoyal@...hat.com>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>

Index: linux-2.6/arch/x86/kernel/e820.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/e820.c
+++ linux-2.6/arch/x86/kernel/e820.c
@@ -1279,6 +1279,10 @@ void __init e820_reserve_resources(void)
 
 	res = alloc_bootmem_low(sizeof(struct resource) * e820.nr_map);
 	for (i = 0; i < e820.nr_map; i++) {
+		if (e820.map[i].type != E820_RAM) {
+			res++;
+			continue;
+		}
 		end = e820.map[i].addr + e820.map[i].size - 1;
 #ifndef CONFIG_RESOURCES_64BIT
 		if (end > 0x100000000ULL) {
--
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