linux-kernel - [PATCH] x86: check command line when CONFIG_X86

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Date:	Fri, 20 Jun 2008 07:42:35 -0700
From:	Yinghai Lu <yhlu.kernel@...il.com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: check command line when CONFIG_X86_MPPARSE is not set


we can not use acpi=off, acpi=noirq and pci=noacpi when mps support is
not there

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

---
 arch/x86/kernel/acpi/boot.c |   12 ++++++++++++
 arch/x86/kernel/setup_32.c  |    2 ++
 arch/x86/kernel/setup_64.c  |    2 ++
 include/linux/acpi.h        |    5 +++++
 4 files changed, 21 insertions(+)

Index: linux-2.6/arch/x86/kernel/acpi/boot.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/acpi/boot.c
+++ linux-2.6/arch/x86/kernel/acpi/boot.c
@@ -1740,6 +1740,18 @@ static int __init parse_pci(char *arg)
 }
 early_param("pci", parse_pci);
 
+void __init acpi_mps_check(void)
+{
+#if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
+/* mptable code is not built-in*/
+	if (acpi_disabled || acpi_noirq) {
+		printk(KERN_ERR "MPS support code is not built-in\n",
+		       "so can not use acpi=off or acpi=noirq or pci=noacpi\n");
+		panic("MPS support is not built-in\n");
+	}
+#endif
+}
+
 #ifdef CONFIG_X86_IO_APIC
 static int __init parse_acpi_skip_timer_override(char *arg)
 {
Index: linux-2.6/arch/x86/kernel/setup_32.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup_32.c
+++ linux-2.6/arch/x86/kernel/setup_32.c
@@ -754,6 +754,8 @@ void __init setup_arch(char **cmdline_p)
 		early_dump_pci_devices();
 #endif
 
+	acpi_mps_check();
+
 	finish_e820_parsing();
 
 	probe_roms();
Index: linux-2.6/arch/x86/kernel/setup_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup_64.c
+++ linux-2.6/arch/x86/kernel/setup_64.c
@@ -359,6 +359,8 @@ void __init setup_arch(char **cmdline_p)
 		early_dump_pci_devices();
 #endif
 
+	acpi_mps_check();
+
 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 	if (init_ohci1394_dma_early)
 		init_ohci1394_dma_on_all_controllers();
Index: linux-2.6/include/linux/acpi.h
===================================================================
--- linux-2.6.orig/include/linux/acpi.h
+++ linux-2.6/include/linux/acpi.h
@@ -82,6 +82,7 @@ char * __acpi_map_table (unsigned long p
 int early_acpi_boot_init(void);
 int acpi_boot_init (void);
 int acpi_boot_table_init (void);
+void acpi_mps_check (void);
 int acpi_numa_init (void);
 
 int acpi_table_init (void);
@@ -250,6 +251,10 @@ static inline int acpi_boot_table_init(v
 	return 0;
 }
 
+static inline void acpi_mps_check(void)
+{
+}
+
 static inline int acpi_check_resource_conflict(struct resource *res)
 {
 	return 0;
--
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