Commit defad230 authored Feb 02, 2007 by Alexey Starikovskiy Committed by Len Brown Feb 02, 2007

ACPI_NUMA: fix HP IA64 simulator issue with extended memory domain



ACPI 3.0 incorporated the SRAT spec, upping the table version to 2,
and extending the size of the proximity domain from 1-byte to 4-bytes.
This extension was into a reserved field that firmware should
set to 0, but the HP simulator had non-zero values there
resulting in unexpected huge numbers.

So mask the domain down to 8-bits for now.
A more general fix will be to check the table version
supplied by firmware and get paranoid about reserved fields.

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

parent 45eded87

arch/ia64/kernel/acpi.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -422,8 +422,8 @@ static int get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
		int pxm;

		pxm = ma->proximity_domain;
		if (ia64_platform_is("sn2"))
		pxm += ma->reserved << 8;
		if (!ia64_platform_is("sn2"))
		pxm &= 0xff;

		return pxm;
		}

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