Eliminate i386 idt_table.

Add CONFIG_X86_NO_IDT to exclude all code which references the idt table.
Make CONFIG_X86_F00F_BUG conditional on CONFIG_X86_NO_IDT.

From: Jan Beulich <JBeulich@novell.com>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>

linux-2.6-xen-sparse/arch/i386/Kconfig

@@ -1186,6 +1186,11 @@ config X86_SYSENTER
 	depends on !X86_NO_TSS
 	default y
 
+config X86_NO_IDT
+	bool
+	depends on X86_XEN
+	default y
+
 config KTIME_SCALAR
 	bool
 	default y

linux-2.6-xen-sparse/arch/i386/Kconfig.cpu

@@ -251,7 +251,7 @@ config X86_PPRO_FENCE
 
 config X86_F00F_BUG
 	bool
-	depends on M586MMX || M586TSC || M586 || M486 || M386
+	depends on (M586MMX || M586TSC || M586 || M486 || M386) && !X86_NO_IDT
 	default y
 
 config X86_WP_WORKS_OK

linux-2.6-xen-sparse/arch/i386/kernel/head-xen.S

@@ -94,19 +94,11 @@ ENTRY(stack_start)
 	.long init_thread_union+THREAD_SIZE
 	.long __BOOT_DS
 
-ready:	.byte 0
-
-.globl idt_descr
-.globl cpu_gdt_descr
-
 	ALIGN
-	.word 0				# 32-bit align idt_desc.address
-idt_descr:
-	.word IDT_ENTRIES*8-1		# idt contains 256 entries
-	.long idt_table
 
 # boot GDT descriptor (later on used by CPU#0):
 	.word 0				# 32 bit align gdt_desc.address
+	.globl cpu_gdt_descr
 cpu_gdt_descr:
 	.word GDT_SIZE
 	.long cpu_gdt_table

linux-2.6-xen-sparse/arch/i386/kernel/traps-xen.c

@@ -61,12 +61,14 @@ asmlinkage int system_call(void);
 /* Do we ignore FPU interrupts ? */
 char ignore_fpu_irq = 0;
 
+#ifndef CONFIG_X86_NO_IDT
 /*
  * The IDT has to be page-aligned to simplify the Pentium
  * F0 0F bug workaround.. We have a special link segment
  * for this.
  */
 struct desc_struct idt_table[256] __attribute__((__section__(".data.idt"))) = { {0, 0}, };
+#endif
 
 asmlinkage void divide_error(void);
 asmlinkage void debug(void);