ACPI: delete the "acpi=ht" boot option

acpi=ht was important in 2003 -- before ACPI was
universally deployed and enabled by default in
the major Linux distributions.

At that time, there were a fair number of people who
or chose to, or needed to, run with acpi=off,
yet also wanted access to Hyper-threading.

Today we find that many invocations of "acpi=ht"
are accidental, and thus is it possible that it
is doing more harm than good.

In 2.6.34, we warn on invocation of acpi=ht.
In 2.6.35, we delete the boot option.

Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 3bc48b0bd3a9..41b924ff0b51 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -143,11 +143,10 @@ and is between 256 and 4096 characters. It is defined in the file
 
         acpi=           [HW,ACPI,X86]
                         Advanced Configuration and Power Interface
-                        Format: { force | off | ht | strict | noirq | rsdt }
+                        Format: { force | off | strict | noirq | rsdt }
                         force -- enable ACPI if default was off
                         off -- disable ACPI if default was on
                         noirq -- do not use ACPI for IRQ routing
-                        ht -- run only enough ACPI to enable Hyper Threading
                         strict -- Be less tolerant of platforms that are not
                                 strictly ACPI specification compliant.
                         rsdt -- prefer RSDT over (default) XSDT