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.

( No effect on any existing config. Newly enabled CONFIG_MAXSMP=y
  will see the new default. )

Signed-off-by: David Rientjes <rientjes@google.com>
LKML-Reference: <alpine.DEB.2.00.1003251538060.8589@chino.kir.corp.google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0eacb1ffb42135b02435fa2f0a1897eca651a7dd..9458685902bddecc3f221012389085084bfb23ef 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1216,8 +1216,8 @@ 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"