#include <linux/init.h>
  #include <linux/kernel_stat.h>
  #include <linux/proc_fs.h>
  #include <linux/seq_file.h>
  
  /*
   * /proc/softirqs  ... display the number of softirqs
   */
  static int show_softirqs(struct seq_file *p, void *v)
  {
  	int i, j;

  	seq_puts(p, "                    ");

  	for_each_possible_cpu(i)
  		seq_printf(p, "CPU%-8d", i);

  	seq_putc(p, '
  ');

  
  	for (i = 0; i < NR_SOFTIRQS; i++) {

  		seq_printf(p, "%12s:", softirq_to_name[i]);

  		for_each_possible_cpu(j)
  			seq_printf(p, " %10u", kstat_softirqs_cpu(i, j));

  		seq_putc(p, '
  ');

  	}
  	return 0;
  }
  
  static int softirqs_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, show_softirqs, NULL);
  }
  
  static const struct file_operations proc_softirqs_operations = {
  	.open		= softirqs_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  };
  
  static int __init proc_softirqs_init(void)
  {
  	proc_create("softirqs", 0, NULL, &proc_softirqs_operations);
  	return 0;
  }
  module_init(proc_softirqs_init);