From 73581c022d2e4484734f226284bda817b2937dfe Mon Sep 17 00:00:00 2001 From: Bob Moore Date: Wed, 26 Feb 2014 10:33:18 +0800 Subject: ACPICA: Add text: ACPICA policy for new _OSI strings. No functional change. Adds further information about why new _OSI strings should be adopted by all hosts as soon as possible. Signed-off-by: Bob Moore Signed-off-by: Lv Zheng Signed-off-by: Rafael J. Wysocki --- drivers/acpi/acpica/utosi.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'drivers/acpi/acpica') diff --git a/drivers/acpi/acpica/utosi.c b/drivers/acpi/acpica/utosi.c index 1e5525e87d34..685766fc6ca8 100644 --- a/drivers/acpi/acpica/utosi.c +++ b/drivers/acpi/acpica/utosi.c @@ -47,6 +47,31 @@ #define _COMPONENT ACPI_UTILITIES ACPI_MODULE_NAME("utosi") +/****************************************************************************** + * + * ACPICA policy for new _OSI strings: + * + * It is the stated policy of ACPICA that new _OSI strings will be integrated + * into this module as soon as possible after they are defined. It is strongly + * recommended that all ACPICA hosts mirror this policy and integrate any + * changes to this module as soon as possible. There are several historical + * reasons behind this policy: + * + * 1) New BIOSs tend to test only the case where the host responds TRUE to + * the latest version of Windows, which would respond to the latest/newest + * _OSI string. Not responding TRUE to the latest version of Windows will + * risk executing untested code paths throughout the DSDT and SSDTs. + * + * 2) If a new _OSI string is recognized only after a significant delay, this + * has the potential to cause problems on existing working machines because + * of the possibility that a new and different path through the ASL code + * will be executed. + * + * 3) New _OSI strings are tending to come out about once per year. A delay + * in recognizing a new string for a significant amount of time risks the + * release of another string which only compounds the initial problem. + * + *****************************************************************************/ /* * Strings supported by the _OSI predefined control method (which is * implemented internally within this module.) -- cgit v1.2.3