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>
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 7914ab0..63bcf39 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -62,7 +62,6 @@
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 @@
/*
* 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 @@
{
/*
* 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 @@
/*
* 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 @@
/* 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;