[ARM SMP] Track CPU idle threads (71f512e8) · Commits · e / devices / android_kernel_fairphone_FP5

arch/arm/kernel/smp.c

+13 −7

Original line number	Diff line number	Diff line
		@@ -80,20 +80,24 @@ static DEFINE_SPINLOCK(smp_call_function_lock);

		int __cpuinit __cpu_up(unsigned int cpu)
		{
		struct task_struct *idle;
		struct cpuinfo_arm *ci = &per_cpu(cpu_data, cpu);
		struct task_struct *idle = ci->idle;
		pgd_t *pgd;
		pmd_t *pmd;
		int ret;

		/*
		* Spawn a new process manually. Grab a pointer to
		* its task struct so we can mess with it
		* Spawn a new process manually, if not already done.
		* Grab a pointer to its task struct so we can mess with it
		*/
		if (!idle) {
		idle = fork_idle(cpu);
		if (IS_ERR(idle)) {
		printk(KERN_ERR "CPU%u: fork() failed\n", cpu);
		return PTR_ERR(idle);
		}
		ci->idle = idle;
		}

		/*
		* Allocate initial page tables to allow the new CPU to
		@@ -236,6 +240,8 @@ void __init smp_prepare_boot_cpu(void)
		{
		unsigned int cpu = smp_processor_id();

		per_cpu(cpu_data, cpu).idle = current;

		cpu_set(cpu, cpu_possible_map);
		cpu_set(cpu, cpu_present_map);
		cpu_set(cpu, cpu_online_map);

+1 −0