arch/x86/oprofile/init.c

   1 /**
   2  * @file init.c
   3  *
   4  * @remark Copyright 2002 OProfile authors
   5  * @remark Read the file COPYING
   6  *
   7  * @author John Levon <levon@movementarian.org>
   8  */
   9
  10 #include <linux/oprofile.h>
  11 #include <linux/init.h>
  12 #include <linux/errno.h>
  13
  14 /* We support CPUs that have performance counters like the Pentium Pro
  15  * with the NMI mode driver.
  16  */
  17
  18 extern int op_nmi_init(struct oprofile_operations * ops);
  19 extern int op_nmi_timer_init(struct oprofile_operations * ops);
  20 extern void op_nmi_exit(void);
  21 extern void x86_backtrace(struct pt_regs * const regs, unsigned int depth);
  22
  23
  24 int __init oprofile_arch_init(struct oprofile_operations * ops)
  25 {
  26         int ret;
  27
  28         ret = -ENODEV;
  29
  30 #ifdef CONFIG_X86_LOCAL_APIC
  31         ret = op_nmi_init(ops);
  32 #endif
  33 #ifdef CONFIG_X86_IO_APIC
  34         if (ret < 0)
  35                 ret = op_nmi_timer_init(ops);
  36 #endif
  37         ops->backtrace = x86_backtrace;
  38
  39         return ret;
  40 }
  41
  42
  43 void oprofile_arch_exit(void)
  44 {
  45 #ifdef CONFIG_X86_LOCAL_APIC
  46         op_nmi_exit();
  47 #endif
  48 }