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struct task_struct {
    volatile long state;   /* -1 unrunnable, 0 runnable, >0 stopped */
     void *stack;
     atomic_t usage;
     unsigned int flags;    /* per process flags, defined below */
     unsigned int ptrace;
 
     int lock_depth;        /* BKL lock depth */
     ……
     ……
}
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#define GET_THREAD_INFO(reg)
     movl $THREAD, reg;
     andl %esp, reg
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#ifdef CONFIG_4KSTACKS
#define THREAD_SIZE            (4096)
#else
#define THREAD_SIZE         (8192)
#endif
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struct task_struct init_task = INIT_TASK(init_task);
#define INIT_TASK(tsk)
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