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Revision 2205cbe8ecaf5f3ab911cef839c94d05ea5b0c76 authored by Alex Chiang on 19 January 2010, 23:55:41 UTC, committed by Len Brown on 20 January 2010, 04:43:47 UTC 
ACPI: processor: restrict early _PDC to opt-in platforms
 
Commit 78f1699 (ACPI: processor: call _PDC early) blindly walks
the namespace and calls _PDC on every processor object it finds.

This change may cause issues on platforms that declare dummy
values for SSDTs on non-present processors (disabled in MADT).
When we call _PDC and dynamically attempt to execute the AML
Load() op on these dummy SSDTs, there's no telling what might
happen.

Rather than finding every platform that has bogus SSDTs, restrict
early _PDC calls to platforms that are known to need early
evaluation of _PDC.

This is a minimal, temporary fix (given the context of the
current release cycle). A real solution of checking the MADT for
non-present processors will be written for the next merge window.

References:

	http://bugzilla.kernel.org/show_bug.cgi?id=14710
	http://bugzilla.kernel.org/show_bug.cgi?id=14954

Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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Kconfig 
#
# SFI Configuration
#

menuconfig SFI
	bool "SFI (Simple Firmware Interface) Support"
	---help---
	The Simple Firmware Interface (SFI) provides a lightweight method
	for platform firmware to pass information to the operating system
	via static tables in memory.  Kernel SFI support is required to
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	based on the 2nd generation Intel Atom processor platform,
	code-named Moorestown.

	For more information, see http://simplefirmware.org

	Say 'Y' here to enable the kernel to boot on SFI-only platforms.
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