diff options
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 39 |
1 files changed, 25 insertions, 14 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 8f49ba1202c3..9e676db0267b 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -696,10 +696,9 @@ static int wake_idle(int cpu, task_t *p) return cpu; cpus_and(tmp, sd->span, cpu_online_map); - for_each_cpu_mask(i, tmp) { - if (!cpu_isset(i, p->cpus_allowed)) - continue; + cpus_and(tmp, tmp, p->cpus_allowed); + for_each_cpu_mask(i, tmp) { if (idle_cpu(i)) return i; } @@ -2941,6 +2940,21 @@ out_unlock: return retval; } +/* + * Represents all cpu's present in the system + * In systems capable of hotplug, this map could dynamically grow + * as new cpu's are detected in the system via any platform specific + * method, such as ACPI for e.g. + */ + +cpumask_t cpu_present_map; +EXPORT_SYMBOL(cpu_present_map); + +#ifndef CONFIG_SMP +cpumask_t cpu_online_map = CPU_MASK_ALL; +cpumask_t cpu_possible_map = CPU_MASK_ALL; +#endif + /** * sys_sched_getaffinity - get the cpu affinity of a process * @pid: pid of the process @@ -3320,7 +3334,7 @@ int set_cpus_allowed(task_t *p, cpumask_t new_mask) runqueue_t *rq; rq = task_rq_lock(p, &flags); - if (any_online_cpu(new_mask) == NR_CPUS) { + if (!cpus_intersects(new_mask, cpu_online_map)) { ret = -EINVAL; goto out; } @@ -3495,8 +3509,7 @@ static void migrate_all_tasks(int src_cpu) if (dest_cpu == NR_CPUS) dest_cpu = any_online_cpu(tsk->cpus_allowed); if (dest_cpu == NR_CPUS) { - cpus_clear(tsk->cpus_allowed); - cpus_complement(tsk->cpus_allowed); + cpus_setall(tsk->cpus_allowed); dest_cpu = any_online_cpu(tsk->cpus_allowed); /* Don't tell them about moving exiting tasks @@ -3558,6 +3571,7 @@ static int migration_call(struct notifier_block *nfb, unsigned long action, p = kthread_create(migration_thread, hcpu, "migration/%d",cpu); if (IS_ERR(p)) return NOTIFY_BAD; + p->flags |= PF_NOFREEZE; kthread_bind(p, cpu); /* Must be high prio: stop_machine expects to yield to it. */ rq = task_rq_lock(p, &flags); @@ -3812,7 +3826,7 @@ void sched_domain_debug(void) int j; char str[NR_CPUS]; struct sched_group *group = sd->groups; - cpumask_t groupmask, tmp; + cpumask_t groupmask; cpumask_scnprintf(str, NR_CPUS, sd->span); cpus_clear(groupmask); @@ -3842,8 +3856,7 @@ void sched_domain_debug(void) if (!cpus_weight(group->cpumask)) printk(" ERROR empty group:"); - cpus_and(tmp, groupmask, group->cpumask); - if (cpus_weight(tmp) > 0) + if (cpus_intersects(groupmask, group->cpumask)) printk(" ERROR repeated CPUs:"); cpus_or(groupmask, groupmask, group->cpumask); @@ -3862,8 +3875,7 @@ void sched_domain_debug(void) sd = sd->parent; if (sd) { - cpus_and(tmp, groupmask, sd->span); - if (!cpus_equal(tmp, groupmask)) + if (!cpus_subset(groupmask, sd->span)) printk(KERN_DEBUG "ERROR parent span is not a superset of domain->span\n"); } @@ -3902,16 +3914,15 @@ void __init sched_init(void) /* Set up an initial dummy domain for early boot */ static struct sched_domain sched_domain_init; static struct sched_group sched_group_init; - cpumask_t cpu_mask_all = CPU_MASK_ALL; memset(&sched_domain_init, 0, sizeof(struct sched_domain)); - sched_domain_init.span = cpu_mask_all; + sched_domain_init.span = CPU_MASK_ALL; sched_domain_init.groups = &sched_group_init; sched_domain_init.last_balance = jiffies; sched_domain_init.balance_interval = INT_MAX; /* Don't balance */ memset(&sched_group_init, 0, sizeof(struct sched_group)); - sched_group_init.cpumask = cpu_mask_all; + sched_group_init.cpumask = CPU_MASK_ALL; sched_group_init.next = &sched_group_init; sched_group_init.cpu_power = SCHED_LOAD_SCALE; #endif |