x86: Disable AMD_NUMA for 32bit for now
Commit 2706a0bf7b
("x86, NUMA: Enable CONFIG_AMD_NUMA on 32bit
too") enabled AMD NUMA for 32bit too. Unfortunately, SPARSEMEM
on 32bit had rather coarse (512MiB) addr->node mapping
granularity due to lack of space in page->flags. This led to
boot failure on certain AMD NUMA machines which had 128MiB
alignment on nodes.
Patches to properly detect this condition and reject NUMA
configuration are posted[1] but deemed too pervasive for merge
at this point (-rc6). Disable AMD NUMA for 32bit for now and
re-enable once the detection logic is merged.
[1] http://thread.gmane.org/gmane.linux.kernel/1161279/focus=1162583
Reported-by: Hans Rosenfeld <hans.rosenfeld@amd.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Conny Seidel <conny.seidel@amd.com>
Link: http://lkml.kernel.org/r/20110711083432.GC943@htj.dyndns.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -1170,7 +1170,7 @@ comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
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config AMD_NUMA
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def_bool y
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prompt "Old style AMD Opteron NUMA detection"
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depends on NUMA && PCI
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depends on X86_64 && NUMA && PCI
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---help---
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Enable AMD NUMA node topology detection. You should say Y here if
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you have a multi processor AMD system. This uses an old method to
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