arch/s390/kernel/profile.c

   1 /*
   2  * arch/s390/kernel/profile.c
   3  *
   4  * Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
   5  * Author(s): Thomas Spatzier (tspat@de.ibm.com)
   6  *
   7  */
   8 #include <linux/proc_fs.h>
   9
  10 static struct proc_dir_entry * root_irq_dir;
  11
  12 static int prof_cpu_mask_read_proc (char *page, char **start, off_t off,
  13                                         int count, int *eof, void *data)
  14 {
  15         int len = cpumask_scnprintf(page, count, *(cpumask_t *)data);
  16         if (count - len < 2)
  17                 return -EINVAL;
  18         len += sprintf(page + len, "\n");
  19         return len;
  20 }
  21
  22 static int prof_cpu_mask_write_proc (struct file *file,
  23                                         const char __user *buffer,
  24                                         unsigned long count, void *data)
  25 {
  26         cpumask_t *mask = (cpumask_t *)data;
  27         unsigned long full_count = count, err;
  28         cpumask_t new_value;
  29
  30         err = cpumask_parse(buffer, count, new_value);
  31         if (err)
  32                 return err;
  33
  34         *mask = new_value;
  35         return full_count;
  36 }
  37
  38 cpumask_t prof_cpu_mask = CPU_MASK_ALL;
  39
  40 void init_irq_proc(void)
  41 {
  42         struct proc_dir_entry *entry;
  43
  44         /* create /proc/irq */
  45         root_irq_dir = proc_mkdir("irq", 0);
  46
  47         /* create /proc/irq/prof_cpu_mask */
  48         entry = create_proc_entry("prof_cpu_mask", 0600, root_irq_dir);
  49
  50         if (!entry)
  51                 return;
  52
  53         entry->nlink = 1;
  54         entry->data = (void *)&prof_cpu_mask;
  55         entry->read_proc = prof_cpu_mask_read_proc;
  56         entry->write_proc = prof_cpu_mask_write_proc;
  57 }