[PATCH] ARM SMP: Initialise cpu_present_map

Rather than relying on the fixup code in init/main.c, explicitly
initialise cpu_present_map.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/kernel/smp.c

@@ -236,6 +236,7 @@ void __init smp_prepare_boot_cpu(void)
 	unsigned int cpu = smp_processor_id();
 
 	cpu_set(cpu, cpu_possible_map);
+	cpu_set(cpu, cpu_present_map);
 	cpu_set(cpu, cpu_online_map);
 }
 

arch/arm/mach-integrator/platsmp.c

@@ -174,11 +174,13 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 		max_cpus = ncores;
 
 	/*
-	 * Initialise the present mask - this tells us which CPUs should
-	 * be present.
+	 * Initialise the possible/present maps.
+	 * cpu_possible_map describes the set of CPUs which may be present
+	 * cpu_present_map describes the set of CPUs populated
 	 */
 	for (i = 0; i < max_cpus; i++) {
 		cpu_set(i, cpu_possible_map);
+		cpu_set(i, cpu_present_map);
 	}
 
 	/*