1 files changed, 20 insertions, 6 deletions

diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 8e20754dd31..84f4cbf652e 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -281,6 +281,7 @@ static void __cpuinit smp_store_cpu_info(unsigned int cpuid)
 	struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid);
 
 	cpu_info->loops_per_jiffy = loops_per_jiffy;
+	cpu_info->cpuid = read_cpuid_id();
 
 	store_cpu_topology(cpuid);
 }
@@ -294,22 +295,29 @@ static void percpu_timer_setup(void);
 asmlinkage void __cpuinit secondary_start_kernel(void)
 {
 	struct mm_struct *mm = &init_mm;
-	unsigned int cpu = smp_processor_id();
+	unsigned int cpu;
+
+	/*
+	 * The identity mapping is uncached (strongly ordered), so
+	 * switch away from it before attempting any exclusive accesses.
+	 */
+	cpu_switch_mm(mm->pgd, mm);
+	enter_lazy_tlb(mm, current);
+	local_flush_tlb_all();
 
 	/*
 	 * All kernel threads share the same mm context; grab a
 	 * reference and switch to it.
 	 */
+	cpu = smp_processor_id();
 	atomic_inc(&mm->mm_count);
 	current->active_mm = mm;
 	cpumask_set_cpu(cpu, mm_cpumask(mm));
-	cpu_switch_mm(mm->pgd, mm);
-	enter_lazy_tlb(mm, current);
-	local_flush_tlb_all();
+
+	cpu_init();
 
 	printk("CPU%u: Booted secondary processor\n", cpu);
 
-	cpu_init();
 	preempt_disable();
 	trace_hardirqs_off();
 
@@ -365,6 +373,7 @@ void __init smp_cpus_done(unsigned int max_cpus)
 
 void __init smp_prepare_boot_cpu(void)
 {
+	set_my_cpu_offset(per_cpu_offset(smp_processor_id()));
 }
 
 void __init smp_prepare_cpus(unsigned int max_cpus)
@@ -415,6 +424,11 @@ void arch_send_call_function_ipi_mask(const struct cpumask *mask)
 	smp_cross_call(mask, IPI_CALL_FUNC);
 }
 
+void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
+{
+	smp_cross_call(mask, IPI_WAKEUP);
+}
+
 void arch_send_call_function_single_ipi(int cpu)
 {
 	smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
@@ -437,7 +451,7 @@ void show_ipi_list(struct seq_file *p, int prec)
 	for (i = 0; i < NR_IPI; i++) {
 		seq_printf(p, "%*s%u: ", prec - 1, "IPI", i);
 
-		for_each_present_cpu(cpu)
+		for_each_online_cpu(cpu)
 			seq_printf(p, "%10u ",
 				   __get_irq_stat(cpu, ipi_irqs[i]));