linux-kernel - [patch] x86: fix fake apicid to node mapping for numa emulation

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Date:	Tue, 4 May 2010 17:00:57 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
cc:	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [patch] x86: fix fake apicid to node mapping for numa emulation

apicids must be mapped to the lowest node ids to maintain generic kernel
use of functions such as cpu_to_node() that determine device affinity.

Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 Third resend of the same patch.

 arch/x86/mm/srat_64.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/mm/srat_64.c b/arch/x86/mm/srat_64.c
--- a/arch/x86/mm/srat_64.c
+++ b/arch/x86/mm/srat_64.c
@@ -461,7 +461,8 @@ void __init acpi_fake_nodes(const struct bootnode *fake_nodes, int num_nodes)
 		 * node, it must now point to the fake node ID.
 		 */
 		for (j = 0; j < MAX_LOCAL_APIC; j++)
-			if (apicid_to_node[j] == nid)
+			if (apicid_to_node[j] == nid &&
+			    fake_apicid_to_node[j] == NUMA_NO_NODE)
 				fake_apicid_to_node[j] = i;
 	}
 	for (i = 0; i < num_nodes; i++)
--
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