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, 3 insertions, 16 deletions

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 7914ab0ad76..63bcf39f8f2 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -62,7 +62,6 @@ EXPORT_SYMBOL(acpi_disabled);
 int acpi_noirq;                         /* skip ACPI IRQ initialization */
 int acpi_pci_disabled;          /* skip ACPI PCI scan and IRQ initialization */
 EXPORT_SYMBOL(acpi_pci_disabled);
-int acpi_ht __initdata = 1;     /* enable HT */
 
 int acpi_lapic;
 int acpi_ioapic;
@@ -1460,9 +1459,8 @@ void __init acpi_boot_table_init(void)
 
         /*
          * If acpi_disabled, bail out
-         * One exception: acpi=ht continues far enough to enumerate LAPICs
          */
-        if (acpi_disabled && !acpi_ht)
+        if (acpi_disabled)
                 return; 
 
         /*
@@ -1493,9 +1491,8 @@ int __init early_acpi_boot_init(void)
 {
         /*
          * If acpi_disabled, bail out
-         * One exception: acpi=ht continues far enough to enumerate LAPICs
          */
-        if (acpi_disabled && !acpi_ht)
+        if (acpi_disabled)
                 return 1;
 
         /*
@@ -1513,9 +1510,8 @@ int __init acpi_boot_init(void)
 
         /*
          * If acpi_disabled, bail out
-         * One exception: acpi=ht continues far enough to enumerate LAPICs
          */
-        if (acpi_disabled && !acpi_ht)
+        if (acpi_disabled)
                 return 1;
 
         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
@@ -1550,21 +1546,12 @@ static int __init parse_acpi(char *arg)
         /* acpi=force to over-ride black-list */
         else if (strcmp(arg, "force") == 0) {
                 acpi_force = 1;
-                acpi_ht = 1;
                 acpi_disabled = 0;
         }
         /* acpi=strict disables out-of-spec workarounds */
         else if (strcmp(arg, "strict") == 0) {
                 acpi_strict = 1;
         }
-        /* Limit ACPI just to boot-time to enable HT */
-        else if (strcmp(arg, "ht") == 0) {
-                if (!acpi_force) {
-                        printk(KERN_WARNING "acpi=ht will be removed in Linux-2.6.35\n");
-                        disable_acpi();
-                }
-                acpi_ht = 1;
-        }
         /* acpi=rsdt use RSDT instead of XSDT */
         else if (strcmp(arg, "rsdt") == 0) {
                 acpi_rsdt_forced = 1;