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[ARM SMP] Track CPU idle threads

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Track the idle thread task_struct for each CPU.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2005-11-02 21:51:40 +00:00 committed by Russell King
parent 7e86df2732
commit 71f512e897
2 changed files with 14 additions and 7 deletions
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20
arch/arm/kernel/smp.c
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@ -80,19 +80,23 @@ 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
*/
idle = fork_idle(cpu);
if (IS_ERR(idle)) {
printk(KERN_ERR "CPU%u: fork() failed\n", cpu);
return PTR_ERR(idle);
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;
}
/*
@ -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
include/asm-arm/cpu.h
View File

@ -16,6 +16,7 @@
struct cpuinfo_arm {
struct cpu cpu;
#ifdef CONFIG_SMP
struct task_struct *idle;
unsigned int loops_per_jiffy;
#endif
};