commit 6ed09fc142ae8d938bf225e297e0be12fdbd1381
Author: Julian Anastasov <[email protected]>
Date: Thu Feb 23 22:40:43 2012 +0200

ACPICA: Fix regression in FADT revision checks

commit 3e80acd1af40fcd91a200b0416a7616b20c5d647 upstream.

commit 64b3db22c04586997ab4be46dd5a5b99f8a2d390 (2.6.39),
"Remove use of unreliable FADT revision field" causes regression
for old P4 systems because now cst_control and other fields are
not reset to 0.

The effect is that acpi_processor_power_init will notice
cst_control != 0 and a write to CST_CNT register is performed
that should not happen. As result, the system oopses after the
"No _CST, giving up" message, sometimes in acpi_ns_internalize_name,
sometimes in acpi_ns_get_type, usually at random places. May be
during migration to CPU 1 in acpi_processor_get_throttling.

Every one of these settings help to avoid this problem:
- acpi=off
- processor.nocst=1
- maxcpus=1

The fix is to update acpi_gbl_FADT.header.length after
the original value is used to check for old revisions.

https://bugzilla.kernel.org/show_bug.cgi?id=42700
https://bugzilla.redhat.com/show_bug.cgi?id=727865

Signed-off-by: Julian Anastasov <[email protected]>
Acked-by: Bob Moore <[email protected]>
Signed-off-by: Len Brown <len.brow[email protected]>
Cc: Jonathan Nieder <[email protected]>
Cc: Josh Boyer <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

该升级换代了，现在i处理器已经干到第三代了