[PATCH for 2.6.19] [1/9] x86_64: Fix partial page check to ensure unusable memory is not being marked usable.

[Andi Kleen]

From: "Aaron Durbin" <adurbin@xxxxxxxxxx>
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 <adurbin@xxxxxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxx>

---
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)
 			continue;
 
 		/* Check if end_pfn_map should be updated */
-
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