linux/x86_64 2.6.18: remove orig_ist

Index: head-2007-02-27/arch/x86_64/kernel/init_task.c
===================================================================
@@ -47,11 +47,11 @@ EXPORT_SYMBOL(init_task);
  * on exact cacheline boundaries, to eliminate cacheline ping-pong.
  */ 
 DEFINE_PER_CPU(struct tss_struct, init_tss) ____cacheline_internodealigned_in_smp = INIT_TSS;
-#endif
 
 /* Copies of the original ist values from the tss are only accessed during
  * debugging, no special alignment required.
  */
 DEFINE_PER_CPU(struct orig_ist, orig_ist);
+#endif
 
 #define ALIGN_TO_4K __attribute__((section(".data.init_task")))

Index: head-2007-02-27/include/asm-x86_64/mach-xen/asm/processor.h
===================================================================
@@ -246,11 +246,13 @@ DECLARE_PER_CPU(struct tss_struct,init_t
 
 
 extern struct cpuinfo_x86 boot_cpu_data;
+#ifndef CONFIG_X86_NO_TSS
 /* Save the original ist values for checking stack pointers during debugging */
 struct orig_ist {
 	unsigned long ist[7];
 };
 DECLARE_PER_CPU(struct orig_ist, orig_ist);
+#endif
 
 #ifdef CONFIG_X86_VSMP
 #define ARCH_MIN_TASKALIGN	(1 << INTERNODE_CACHE_SHIFT)