linux-kernel - [018/145] ACPI: fix "acpi=ht" boot option

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Message-Id: <20100313002706.823730568@kvm.kroah.org>
Date:	Fri, 12 Mar 2010 16:25:51 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Len Brown <len.brown@...el.com>
Subject: [018/145] ACPI: fix "acpi=ht" boot option

2.6.32-stable review patch.  If anyone has any objections, please let me know.

----------------
From: Len Brown <len.brown@...el.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@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.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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