diff -Nru linux/arch/x86_64/kernel/head.S linux~/arch/x86_64/kernel/head.S
--- linux/arch/x86_64/kernel/head.S	2004-02-19 03:10:55.000000000 -0800
+++ linux~/arch/x86_64/kernel/head.S	2004-02-19 04:21:51.000000000 -0800
@@ -358,7 +358,7 @@
 	/* asm/segment.h:GDT_ENTRIES must match this */	
 	/* This should be a multiple of the cache line size */
 	/* GDTs of other CPUs: */	
-	.fill (L1_CACHE_BYTES * NR_CPUS) - (gdt_end - cpu_gdt_table) 
+	.fill (GDT_SIZE * NR_CPUS) - (gdt_end - cpu_gdt_table) 
 
 	.align  L1_CACHE_BYTES
 ENTRY(idt_table)	
diff -Nru linux/arch/x86_64/kernel/setup.c linux~/arch/x86_64/kernel/setup.c
--- linux/arch/x86_64/kernel/setup.c	2004-02-19 03:10:55.000000000 -0800
+++ linux~/arch/x86_64/kernel/setup.c	2004-02-19 03:18:58.000000000 -0800
@@ -586,6 +586,7 @@
 	return r;
 }
 
+#ifdef CONFIG_X86_HT
 static void __init detect_ht(void)
 {
 	extern	int phys_proc_id[NR_CPUS];
@@ -632,6 +633,7 @@
 		       phys_proc_id[cpu]);
 	}
 }
+#endif
 	
 #define LVL_1_INST	1
 #define LVL_1_DATA	2
@@ -761,8 +763,10 @@
 		c->x86_cache_size = l2 ? l2 : (l1i+l1d);
 	}
 
+#ifdef CONFIG_X86_HT
 	if (cpu_has(c, X86_FEATURE_HT))
 		detect_ht(); 
+#endif
 
 	n = cpuid_eax(0x80000000);
 	if (n >= 0x80000008) {
diff -Nru linux/arch/x86_64/kernel/x8664_ksyms.c linux~/arch/x86_64/kernel/x8664_ksyms.c
--- linux/arch/x86_64/kernel/x8664_ksyms.c	2004-02-19 03:10:55.000000000 -0800
+++ linux~/arch/x86_64/kernel/x8664_ksyms.c	2004-02-19 03:20:04.000000000 -0800
@@ -194,7 +194,10 @@
 
 EXPORT_SYMBOL(die_chain);
 
+#ifdef CONFIG_X86_HT
+EXPORT_SYMBOL(smp_num_siblings);
 EXPORT_SYMBOL(cpu_sibling_map);
+#endif
 
 extern void do_softirq_thunk(void);
 EXPORT_SYMBOL_NOVERS(do_softirq_thunk);
diff -Nru linux/include/asm-x86_64/segment.h linux~/include/asm-x86_64/segment.h
--- linux/include/asm-x86_64/segment.h	2004-02-19 03:11:05.000000000 -0800
+++ linux~/include/asm-x86_64/segment.h	2004-02-19 04:21:17.000000000 -0800
@@ -40,7 +40,7 @@
 #define FS_TLS_SEL ((GDT_ENTRY_TLS_MIN+FS_TLS)*8 + 3)
 
 #define IDT_ENTRIES 256
-#define GDT_ENTRIES (L1_CACHE_BYTES / 8) 
+#define GDT_ENTRIES 16
 #define GDT_SIZE (GDT_ENTRIES * 8)
 #define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)