linux-kernel - [patch] x86: increase CONFIG_NODES

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Message-ID: <alpine.DEB.2.00.1003101537330.30724@chino.kir.corp.google.com>
Date:	Wed, 10 Mar 2010 15:42:04 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
cc:	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [patch] x86: increase CONFIG_NODES_SHIFT max to 10

Some larger systems require more than 512 nodes, so increase the maximum
CONFIG_NODES_SHIFT to 10 for a new max of 1024 nodes.

This was tested with numa=fake=64M on systems with more than 64GB of RAM.
A total of 1022 nodes were initialized.

Successfully builds with no additional warnings on x86_64 allyesconfig.

Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 Greg KH has queued up numa-fix-BUILD_BUG_ON-for-node_read_distance.patch
 for 2.6.35 to fix the build error when CONFIG_NODES_SHIFT is set to 10.
 See http://lkml.org/lkml/2010/3/10/390

 arch/x86/Kconfig |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1213,8 +1213,8 @@ config NUMA_EMU
 
 config NODES_SHIFT
 	int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
-	range 1 9
-	default "9" if MAXSMP
+	range 1 10
+	default "10" if MAXSMP
 	default "6" if X86_64
 	default "4" if X86_NUMAQ
 	default "3"
--
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