linux-imx

/* Kernel thread helper functions.

 *   Copyright (C) 2004 IBM Corporation, Rusty Russell.

 *

 * Creation is done via kthreadd, so that we get a clean environment

 * even if we're invoked from userspace (think modprobe, hotplug cpu,

 * etc.).

 */

#include <uapi/linux/sched/types.h>

#include <linux/sched.h>

#include <linux/sched/task.h>

#include <linux/kthread.h>

#include <linux/completion.h>

#include <linux/err.h>

#include <linux/cpuset.h>

#include <linux/unistd.h>

#include <linux/file.h>

#include <linux/export.h>

#include <linux/mutex.h>

#include <linux/slab.h>

#include <linux/freezer.h>

#include <linux/ptrace.h>

#include <linux/uaccess.h>

#include <linux/numa.h>

#include <trace/events/sched.h>

​

static DEFINE_SPINLOCK(kthread_create_lock);

static LIST_HEAD(kthread_create_list);

struct task_struct *kthreadd_task;

​

struct kthread_create_info

{

    /* Information passed to kthread() from kthreadd. */

    int (*threadfn)(void *data);

    void *data;

    int node;

​

    /* Result passed back to kthread_create() from kthreadd. */

    struct task_struct *result;

    struct completion *done;

​

    struct list_head list;

};

​

struct kthread {

    unsigned long flags;

    unsigned int cpu;

    void *data;

    struct completion parked;

    struct completion exited;

#ifdef CONFIG_BLK_CGROUP

    struct cgroup_subsys_state *blkcg_css;

#endif

};

​

enum KTHREAD_BITS {

    KTHREAD_IS_PER_CPU = 0,

    KTHREAD_SHOULD_STOP,

    KTHREAD_SHOULD_PARK,

};

​

static inline void set_kthread_struct(void *kthread)

{

    /*