#include <linux/cpu.h>
#include <linux/err.h>
#include <linux/syscalls.h>
+#include <linux/kthread.h>
#include <asm/atomic.h>
#include <asm/semaphore.h>
#include <asm/uaccess.h>
static atomic_t stopmachine_thread_ack;
static DECLARE_MUTEX(stopmachine_mutex);
-static int stopmachine(void *cpu)
+static int stopmachine(void *unused)
{
int irqs_disabled = 0;
int prepared = 0;
- set_cpus_allowed(current, cpumask_of_cpu((int)(long)cpu));
-
/* Ack: we are alive */
smp_mb(); /* Theoretically the ack = 0 might not be on this CPU yet. */
atomic_inc(&stopmachine_thread_ack);
static int stop_machine(void)
{
- int i, ret = 0;
+ int ret = 0;
+ unsigned int i;
struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
- mm_segment_t old_fs = get_fs();
/* One high-prio thread per cpu. We'll do this one. */
- set_fs(KERNEL_DS);
- sys_sched_setscheduler(current->pid, SCHED_FIFO,
- (struct sched_param __user *)¶m);
- set_fs(old_fs);
+ sched_setscheduler(current, SCHED_FIFO, ¶m);
atomic_set(&stopmachine_thread_ack, 0);
stopmachine_num_threads = 0;
stopmachine_state = STOPMACHINE_WAIT;
for_each_online_cpu(i) {
- if (i == _smp_processor_id())
+ struct task_struct *tsk;
+ if (i == raw_smp_processor_id())
continue;
- ret = kernel_thread(stopmachine, (void *)(long)i,CLONE_KERNEL);
- if (ret < 0)
+ tsk = kthread_create(stopmachine, NULL, "stopmachine");
+ if (IS_ERR(tsk)) {
+ ret = PTR_ERR(tsk);
break;
+ }
+ kthread_bind(tsk, i);
+ wake_up_process(tsk);
stopmachine_num_threads++;
}
return ret;
}
- /* Don't schedule us away at this point, please. */
- local_irq_disable();
-
/* Now they are all started, make them hold the CPUs, ready. */
+ preempt_disable();
stopmachine_set_state(STOPMACHINE_PREPARE);
/* Make them disable irqs. */
+ local_irq_disable();
stopmachine_set_state(STOPMACHINE_DISABLE_IRQ);
return 0;
{
stopmachine_set_state(STOPMACHINE_EXIT);
local_irq_enable();
+ preempt_enable_no_resched();
}
struct stop_machine_data
/* If they don't care which CPU fn runs on, bind to any online one. */
if (cpu == NR_CPUS)
- cpu = _smp_processor_id();
+ cpu = raw_smp_processor_id();
p = kthread_create(do_stop, &smdata, "kstopmachine");
if (!IS_ERR(p)) {