[Xen-ia64-devel] [PATCH] Fix acpi_parse_lsapic for host SMP

[Masaki Kanno <kanno.masaki@xxxxxxxxxxxxxx>]

Hi,

This patch is intended to correct the number of CPUs.

Our IPF machines are the following configurations.
 - Total logical cpus = 16
  -- 4 sockets
  -- 2 cores
  -- 2 threads

I changed the setting of BIOS, and invalidated the hyperthread, and I built Xen 
with NR_CPUS=8.
As a result, it became like attached file xendmesg1.txt.
 - Available cpus 3
 - Total cpus 8

Next, I built Xen with NR_CPUS=16.
As a result, it became like attached file xendmesg2.txt.
 - Available cpus 8
 - Total cpus 16

I thought not to match the analysis of the lsapic entry to the value of 
NR_CPUS. 

It is an outline of patch as follows.
 1. Count up the lsapic entry by using 
acpi_table_count_madt()/acpi_table_count_madt_family().
 2. Call acpi_parse_lsapic() by using the number of lsapic entries.
 3. Count up the available_cpus by using acpi_parse_lsapic(), however NR_CPUS 
is not exceeded.

Signed-off-by: Masaki Kanno <kanno.masaki@xxxxxxxxxxxxxx>

Best Regards,
 Kan

Attachment: xendmesg1.txt
Description: Binary data

Attachment: xendmesg2.txt
Description: Binary data

Attachment: lsapic.patch
Description: Binary data

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