SMP - Cpu local variables

- most global variables carry information which is specific to the
  local CPU and each CPU must have its own copy

- cpu local variable must be declared in cpulocal.h between
  DECLARE_CPULOCAL_START and DECLARE_CPULOCAL_END markers using
  DECLARE_CPULOCAL macro

- to access the cpu local data the provided macros must be used

	get_cpu_var(cpu, name)
	get_cpu_var_ptr(cpu, name)

	get_cpulocal_var(name)
	get_cpulocal_var_ptr(name)

- using this macros makes future changes in the implementation
  possible

- switching to ELF will make the declaration of cpu local data much
  simpler, e.g.

  CPULOCAL int blah;

  anywhere in the kernel source code

kernel/clock.c

@@ -60,7 +60,7 @@ PRIVATE clock_t next_timeout;	/* realtime that next timer expires */
 PRIVATE clock_t realtime = 0;		      /* real time clock */
 
 /*
- * The boot processor timer interrupt handler. In addition to non-boot cpus it
+ * The boot processos timer interrupt handler. In addition to non-boot cpus it
  * keeps real time and notifies the clock task if need be
  */
 extern unsigned ooq_msg;
@@ -195,9 +195,8 @@ PUBLIC int ap_timer_int_handler(void)
 	 * user's system time.
 	 */
 
-	/* FIXME prepared for get_cpu_local_var() */
-	p = proc_ptr;
-	billp = bill_ptr;
+	p = get_cpulocal_var(proc_ptr);
+	billp = get_cpulocal_var(bill_ptr);
 
 	p->p_user_time += ticks;