Patch "ACPICA: Tables: Enable default 64-bit FADT addresses favor" has been added to the 4.1-stable tree

Patch "ACPICA: Tables: Enable default 64-bit FADT addresses favor" has been added to the 4.1-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ACPICA: Tables: Enable default 64-bit FADT addresses favor

to the 4.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     acpica-tables-enable-default-64-bit-fadt-addresses-favor.patch
and it can be found in the queue-4.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 0ea61381788a37d864f9841b0fe97d40f7058f3b Mon Sep 17 00:00:00 2001
From: Lv Zheng <lv.zheng@intel.com>
Date: Wed, 1 Jul 2015 14:43:34 +0800
Subject: ACPICA: Tables: Enable default 64-bit FADT addresses favor

From: Lv Zheng <lv.zheng@intel.com>

commit 0ea61381788a37d864f9841b0fe97d40f7058f3b upstream.

ACPICA commit 4da56eeae0749dfe8491285c1e1fad48f6efafd8

The following commit temporarily disables correct 64-bit FADT addresses
favor during the period the root cause of the bug is not fixed:
 Commit: 85dbd5801f62b66e2aa7826aaefcaebead44c8a6
 ACPICA: Tables: Restore old behavor to favor 32-bit FADT addresses.

With enough protections, this patch re-enables 64-bit FADT addresses by
default. If regressions are reported against such change, this patch should
be bisected and reverted.
Note that 64-bit FACS favor and 64-bit firmware waking vector favor are
excluded by this commit in order not to break OSPMs. Lv Zheng.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=74021
Link: https://github.com/acpica/acpica/commit/4da56eea
Reported-and-tested-by: Oswald Buddenhagen <ossi@kde.org>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 include/acpi/acpixf.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -195,9 +195,9 @@ ACPI_INIT_GLOBAL(u8, acpi_gbl_do_not_use
  * address. Although ACPICA adheres to the ACPI specification which
  * requires the use of the corresponding 64-bit address if it is non-zero,
  * some machines have been found to have a corrupted non-zero 64-bit
- * address. Default is TRUE, favor the 32-bit addresses.
+ * address. Default is FALSE, do not favor the 32-bit addresses.
  */
-ACPI_INIT_GLOBAL(u8, acpi_gbl_use32_bit_fadt_addresses, TRUE);
+ACPI_INIT_GLOBAL(u8, acpi_gbl_use32_bit_fadt_addresses, FALSE);
 
 /*
  * Optionally use 32-bit FACS table addresses.


Patches currently in stable-queue which might be from lv.zheng@intel.com are

queue-4.1/acpica-tables-fix-an-issue-that-facs-initialization-is-performed-twice.patch
queue-4.1/acpica-tables-enable-default-64-bit-fadt-addresses-favor.patch
queue-4.1/acpica-tables-enable-both-32-bit-and-64-bit-facs.patch