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Date:	Tue, 14 Nov 2006 17:08:51 +0100 (CET)
From:	Andi Kleen <>
To:	"Aaron Durbin" <>,,
Subject: [PATCH for 2.6.19] [1/9] x86_64: Fix partial page check to ensure unusable memory is not being marked usable.

From: "Aaron Durbin" <>
Fix partial page check in e820_register_active_regions to ensure
partial pages are
not being marked as active in the memory pool.

Signed-off-by: Aaron Durbin <>
Signed-off-by: Andi Kleen <>

This was causing a machine to reboot w/ an area in the e820 that was less
than the page size because the upper address was being use to mark a hole as
active in the memory pool.

 arch/x86_64/kernel/e820.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

Index: linux/arch/x86_64/kernel/e820.c
--- linux.orig/arch/x86_64/kernel/e820.c
+++ linux/arch/x86_64/kernel/e820.c
@@ -278,7 +278,7 @@ e820_register_active_regions(int nid, un
 								>> PAGE_SHIFT;
 		/* Skip map entries smaller than a page */
-		if (ei_startpfn > ei_endpfn)
+		if (ei_startpfn >= ei_endpfn)
 		/* Check if end_pfn_map should be updated */
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