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#ifndef _LINUX_STOP_MACHINE
#define _LINUX_STOP_MACHINE
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/smp.h>
#include <linux/list.h>
typedef int (*cpu_stop_fn_t)(void *arg);
#ifdef CONFIG_SMP
struct cpu_stop_work {
struct list_head list;
cpu_stop_fn_t fn;
void *arg;
struct cpu_stop_done *done;
};
extern struct mutex stop_cpus_mutex;
int stop_one_cpu(unsigned int cpu, cpu_stop_fn_t fn, void *arg);
void stop_one_cpu_nowait(unsigned int cpu, cpu_stop_fn_t fn, void *arg,
struct cpu_stop_work *work_buf);
int stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg);
int try_stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg);
#else
#include <linux/workqueue.h>
struct cpu_stop_work {
struct work_struct work;
cpu_stop_fn_t fn;
void *arg;
};
static inline int stop_one_cpu(unsigned int cpu, cpu_stop_fn_t fn, void *arg)
{
int ret = -ENOENT;
preempt_disable();
if (cpu == smp_processor_id())
ret = fn(arg);
preempt_enable();
return ret;
}
static void stop_one_cpu_nowait_workfn(struct work_struct *work)
{
struct cpu_stop_work *stwork =
container_of(work, struct cpu_stop_work, work);
preempt_disable();
stwork->fn(stwork->arg);
preempt_enable();
}
static inline void stop_one_cpu_nowait(unsigned int cpu,
cpu_stop_fn_t fn, void *arg,
struct cpu_stop_work *work_buf)
{
if (cpu == smp_processor_id()) {
INIT_WORK(&work_buf->work, stop_one_cpu_nowait_workfn);
work_buf->fn = fn;
work_buf->arg = arg;
schedule_work(&work_buf->work);
}
}
static inline int stop_cpus(const struct cpumask *cpumask,
cpu_stop_fn_t fn, void *arg)
{
if (cpumask_test_cpu(raw_smp_processor_id(), cpumask))
return stop_one_cpu(raw_smp_processor_id(), fn, arg);
return -ENOENT;
}
static inline int try_stop_cpus(const struct cpumask *cpumask,
cpu_stop_fn_t fn, void *arg)
{
return stop_cpus(cpumask, fn, arg);
}
#endif
#if defined(CONFIG_STOP_MACHINE) && defined(CONFIG_SMP)
int stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus);
int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus);
int stop_machine_from_inactive_cpu(int (*fn)(void *), void *data,
const struct cpumask *cpus);
#else
static inline int __stop_machine(int (*fn)(void *), void *data,
const struct cpumask *cpus)
{
unsigned long flags;
int ret;
local_irq_save(flags);
ret = fn(data);
local_irq_restore(flags);
return ret;
}
static inline int stop_machine(int (*fn)(void *), void *data,
const struct cpumask *cpus)
{
return __stop_machine(fn, data, cpus);
}
static inline int stop_machine_from_inactive_cpu(int (*fn)(void *), void *data,
const struct cpumask *cpus)
{
return __stop_machine(fn, data, cpus);
}
#endif
#endif
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