linux-kernel - [PATCH] x86: let MPS support selectable

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Date:	Thu, 19 Jun 2008 00:18:44 -0700
From:	Yinghai Lu <yhlu.kernel@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Exner <dex@...gonslave.de>, Len Brown <lenb@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: let MPS support selectable



Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>

---
 arch/x86/Kconfig            |   15 ++++++++++++++-
 arch/x86/Kconfig.debug      |    9 ---------
 arch/x86/mm/k8topology_64.c |    4 ++++
 3 files changed, 18 insertions(+), 10 deletions(-)

Index: linux-2.6/arch/x86/Kconfig
===================================================================
--- linux-2.6.orig/arch/x86/Kconfig
+++ linux-2.6/arch/x86/Kconfig
@@ -233,6 +233,19 @@ config SMP
 
 	  If you don't know what to do here, say N.
 
+config X86_FIND_SMP_CONFIG
+	def_bool y
+	depends on X86_MPPARSE || X86_VOYAGER || X86_VISWS
+	depends on X86_32
+
+config X86_MPPARSE
+	def_bool y
+	bool "Enable MPS table"
+	depends on (X86_32 && (X86_LOCAL_APIC && !X86_VISWS)) || X86_64
+	help
+	  For old smp systems that do not have proper acpi support. Newer systems
+	  (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
+
 choice
 	prompt "Subarchitecture Type"
 	default X86_PC
@@ -289,7 +302,7 @@ if X86_GENERICARCH
 
 config X86_NUMAQ
 	bool "NUMAQ (IBM/Sequent)"
-	depends on SMP && X86_32 && PCI
+	depends on SMP && X86_32 && PCI && X86_MPPARSE
 	select NUMA
 	help
 	  This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
Index: linux-2.6/arch/x86/Kconfig.debug
===================================================================
--- linux-2.6.orig/arch/x86/Kconfig.debug
+++ linux-2.6/arch/x86/Kconfig.debug
@@ -130,15 +130,6 @@ config 4KSTACKS
 	  on the VM subsystem for higher order allocations. This option
 	  will also use IRQ stacks to compensate for the reduced stackspace.
 
-config X86_FIND_SMP_CONFIG
-	def_bool y
-	depends on X86_MPPARSE || X86_VOYAGER || X86_VISWS
-	depends on X86_32
-
-config X86_MPPARSE
-	def_bool y
-	depends on (X86_32 && (X86_LOCAL_APIC && !X86_VISWS)) || X86_64
-
 config DOUBLEFAULT
 	default y
 	bool "Enable doublefault exception handler" if EMBEDDED
Index: linux-2.6/arch/x86/mm/k8topology_64.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/k8topology_64.c
+++ linux-2.6/arch/x86/mm/k8topology_64.c
@@ -57,18 +57,22 @@ static __init void early_get_boot_cpu_id
 	/*
 	 * Find possible boot-time SMP configuration:
 	 */
+#ifdef CONFIG_X86_MPPARSE
 	early_find_smp_config();
+#endif
 #ifdef CONFIG_ACPI
 	/*
 	 * Read APIC information from ACPI tables.
 	 */
 	early_acpi_boot_init();
 #endif
+#ifdef CONFIG_X86_MPPARSE
 	/*
 	 * get boot-time SMP configuration:
 	 */
 	if (smp_found_config)
 		early_get_smp_config();
+#endif
 	early_init_lapic_mapping();
 }
 
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