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From: Greg KH on 12 Mar 2010 20:20
2.6.32-stable review patch. If anyone has any objections, please let me know.

----------------
From: Len Brown <len.brown(a)intel.com>

commit 49bf83a45fc677db1ed44d0e072e6aaeabe4e124 upstream.

We broke "acpi=ht" in 2.6.32 by disabling MADT parsing
for acpi=disabled. e5b8fc6ac158f65598f58dba2c0d52ba3b412f52
This also broke systems which invoked acpi=ht via DMI blacklist.

acpi=ht is a really ugly hack,
but restore it for those that still use it.

http://bugzilla.kernel.org/show_bug.cgi?id=14886

Signed-off-by: Len Brown <len.brown(a)intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>

---
arch/ia64/include/asm/acpi.h | 1 +
drivers/acpi/tables.c | 4 ++--
2 files changed, 3 insertions(+), 2 deletions(-)

--- a/arch/ia64/include/asm/acpi.h
+++ b/arch/ia64/include/asm/acpi.h
@@ -94,6 +94,7 @@ ia64_acpi_release_global_lock (unsigned
#define acpi_noirq 0 /* ACPI always enabled on IA64 */
#define acpi_pci_disabled 0 /* ACPI PCI always enabled on IA64 */
#define acpi_strict 1 /* no ACPI spec workarounds on IA64 */
+#define acpi_ht 0 /* no HT-only mode on IA64 */
#endif
#define acpi_processor_cstate_check(x) (x) /* no idle limits on IA64 :) */
static inline void disable_acpi(void) { }
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -213,7 +213,7 @@ acpi_table_parse_entries(char *id,
unsigned long table_end;
acpi_size tbl_size;

- if (acpi_disabled)
+ if (acpi_disabled && !acpi_ht)
return -ENODEV;

if (!handler)
@@ -280,7 +280,7 @@ int __init acpi_table_parse(char *id, ac
struct acpi_table_header *table = NULL;
acpi_size tbl_size;

- if (acpi_disabled)
+ if (acpi_disabled && !acpi_ht)
return -ENODEV;

if (!handler)


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