[PATCH] Fix memory corruption on hyperthreaded x86-64 machines

Fix memory corruption in the HT init on x86-64 recently introduced by me.

Fix from from Suresh B. Siddha.

arch/x86_64/kernel/setup.c

@@ -596,8 +596,6 @@ static int __init init_amd(struct cpuinfo_x86 *c)
 static void __init detect_ht(void)
 {
 #ifdef CONFIG_SMP
-	extern	int phys_proc_id[NR_CPUS];
-	
 	u32 	eax, ebx, ecx, edx;
 	int 	index_lsb, index_msb, tmp;
 	int	initial_apic_id;
@@ -1011,7 +1009,6 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 	
 #ifdef CONFIG_X86_HT
 	if (cpu_has_ht) {
-		extern int phys_proc_id[NR_CPUS];
 		seq_printf(m, "physical id\t: %d\n", phys_proc_id[c - cpu_data]);
 		seq_printf(m, "siblings\t: %d\n", smp_num_siblings);
 	}

include/asm-x86_64/smp.h

@@ -48,6 +48,7 @@ extern void (*mtrr_hook) (void);
 extern void zap_low_mappings(void);
 void smp_stop_cpu(void);
 extern char cpu_sibling_map[];
+extern char phys_proc_id[NR_CPUS];
 
 #define SMP_TRAMPOLINE_BASE 0x6000