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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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12
arch/arm/kernel/smp.c
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@@ -80,20 +80,24 @@ static DEFINE_SPINLOCK(smp_call_function_lock);
int __cpuinit __cpu_up(unsigned int cpu) 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; pgd_t *pgd;
pmd_t *pmd; pmd_t *pmd;
int ret; int ret;
/* /*
* Spawn a new process manually. Grab a pointer to * Spawn a new process manually, if not already done.
* its task struct so we can mess with it * Grab a pointer to its task struct so we can mess with it
*/ */
if (!idle) {
idle = fork_idle(cpu); idle = fork_idle(cpu);
if (IS_ERR(idle)) { if (IS_ERR(idle)) {
printk(KERN_ERR "CPU%u: fork() failed\n", cpu); printk(KERN_ERR "CPU%u: fork() failed\n", cpu);
return PTR_ERR(idle); return PTR_ERR(idle);
} }
ci->idle = idle;
}
/* /*
* Allocate initial page tables to allow the new CPU to * 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(); unsigned int cpu = smp_processor_id();
per_cpu(cpu_data, cpu).idle = current;
cpu_set(cpu, cpu_possible_map); cpu_set(cpu, cpu_possible_map);
cpu_set(cpu, cpu_present_map); cpu_set(cpu, cpu_present_map);
cpu_set(cpu, cpu_online_map); cpu_set(cpu, cpu_online_map);

1
include/asm-arm/cpu.h
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@@ -16,6 +16,7 @@
struct cpuinfo_arm { struct cpuinfo_arm {
struct cpu cpu; struct cpu cpu;
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
struct task_struct *idle;
unsigned int loops_per_jiffy; unsigned int loops_per_jiffy;
#endif #endif
}; };