求助:为什么加了<linux/sched.h>之后会有错误啊?有-I /usr/src/linux-2.4.20-8/include
我才学驱动程序,写的一个hello   world
不加 <linux/sched.h> 时正常,加了之后报错

#define   MODULE
#include <linux/module.h>
#include <linux/sched.h>

int   xiayu;

int   init_module(void)
{
  int   err;
  MODULE_LICENSE( "GPL ");  
  printk( " <1> hello,world\n ");
  return   0;
}

void   cleanup_module(void)
{
  printk( " <1> Goodbye   cruel   world\n ");
}


gcc   -c   -I   /usr/src/linux-2.4.20-8/include   /home/xy/root/hello.c

我在网上查了,说要加   -I   /usr/src/linux-2.4.20-8/include

我加了后,只是错误提示变了,但是还是报错,请各位帮帮忙.帮我看看是怎么回事?谢谢了!


In   file   included   from   /usr/src/linux-2.4.20-8/include/linux/sched.h:16,
                                  from   /home/xy/root/hello.c:4:
/usr/src/linux-2.4.20-8/include/linux/timex.h:173:   field   `time '   has   incomplete   type
In   file   included   from   /usr/src/linux-2.4.20-8/include/linux/sched.h:23,
                                  from   /home/xy/root/hello.c:4:
/usr/src/linux-2.4.20-8/include/asm/mmu.h:12:   field   `sem '   has   incomplete   type
In   file   included   from   /usr/src/linux-2.4.20-8/include/linux/sched.h:31,
                                  from   /home/xy/root/hello.c:4:
/usr/src/linux-2.4.20-8/include/linux/pid.h:18:   field   `task_list '   has   incomplete   type
/usr/src/linux-2.4.20-8/include/linux/pid.h:19:   field   `hash_chain '   has   incomplete   type
/usr/src/linux-2.4.20-8/include/linux/pid.h:24:   field   `pid_chain '   has   incomplete   type
/usr/src/linux-2.4.20-8/include/linux/pid.h:36:   parse   error   before   '( '   token
/usr/src/linux-2.4.20-8/include/linux/pid.h:38:   parse   error   before   '( '   token
/usr/src/linux-2.4.20-8/include/linux/pid.h:43:   parse   error   before   '( '   token
/usr/src/linux-2.4.20-8/include/linux/pid.h:49:   parse   error   before   '( '   token
/usr/src/linux-2.4.20-8/include/linux/pid.h:52:   parse   error   before   '( '   token


------解决方案--------------------
哦，你是2.4内核，那看Linux Device Driver 2nd，或许你已经在看了，建议看看它的示例代码，还有Makefile的写法。