linux-kernel - [PATCH] [18/30] x86_64: Don't enable NUMA for a single node in K8 NUMA scanning

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Message-Id: <20070501035816.51A1613CAF@wotan.suse.de>
Date:	Tue,  1 May 2007 05:58:16 +0200 (CEST)
From:	Andi Kleen <ak@...e.de>
To:	patches@...-64.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [18/30] x86_64: Don't enable NUMA for a single node in K8 NUMA scanning


This was supposed to see the full memory on a ASUS A8SX motherboard
with 4GB RAM where the northbridge reports less memory, but it didn't
help there. But it's a reasonable change so let's include it anyways.

Signed-off-by: Andi Kleen <ak@...e.de>

---
 arch/x86_64/mm/k8topology.c |    2 ++
 1 file changed, 2 insertions(+)

Index: linux/arch/x86_64/mm/k8topology.c
===================================================================
--- linux.orig/arch/x86_64/mm/k8topology.c
+++ linux/arch/x86_64/mm/k8topology.c
@@ -62,6 +62,8 @@ int __init k8_scan_nodes(unsigned long s
 
 	reg = read_pci_config(0, nb, 0, 0x60); 
 	numnodes = ((reg >> 4) & 0xF) + 1;
+	if (numnodes <= 1)
+		return -1;
 
 	printk(KERN_INFO "Number of nodes %d\n", numnodes);
 
-
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