diff options
| -rw-r--r-- | kernel/sched.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 0da2b2635c54..c747bc9f3c24 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -5060,6 +5060,17 @@ wait_to_die: } #ifdef CONFIG_HOTPLUG_CPU + +static int __migrate_task_irq(struct task_struct *p, int src_cpu, int dest_cpu) +{ + int ret; + + local_irq_disable(); + ret = __migrate_task(p, src_cpu, dest_cpu); + local_irq_enable(); + return ret; +} + /* * Figure out where task on dead CPU should go, use force if neccessary. * NOTE: interrupts should be disabled by the caller @@ -5098,7 +5109,7 @@ static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p) "longer affine to cpu%d\n", p->pid, p->comm, dead_cpu); } - } while (!__migrate_task(p, dead_cpu, dest_cpu)); + } while (!__migrate_task_irq(p, dead_cpu, dest_cpu)); } /* @@ -5126,7 +5137,7 @@ static void migrate_live_tasks(int src_cpu) { struct task_struct *p, *t; - write_lock_irq(&tasklist_lock); + read_lock(&tasklist_lock); do_each_thread(t, p) { if (p == current) @@ -5136,7 +5147,7 @@ static void migrate_live_tasks(int src_cpu) move_task_off_dead_cpu(src_cpu, p); } while_each_thread(t, p); - write_unlock_irq(&tasklist_lock); + read_unlock(&tasklist_lock); } /* @@ -5214,11 +5225,10 @@ static void migrate_dead(unsigned int dead_cpu, struct task_struct *p) * Drop lock around migration; if someone else moves it, * that's OK. No task can be added to this CPU, so iteration is * fine. - * NOTE: interrupts should be left disabled --dev@ */ - spin_unlock(&rq->lock); + spin_unlock_irq(&rq->lock); move_task_off_dead_cpu(dead_cpu, p); - spin_lock(&rq->lock); + spin_lock_irq(&rq->lock); put_task_struct(p); } |