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 /*
  15  * We support CPUs that have performance counters like the Pentium Pro
  16  * with the NMI mode driver.
  17  */
  18
  19 extern int op_nmi_init(struct oprofile_operations *ops);
  20 extern int op_nmi_timer_init(struct oprofile_operations *ops);
  21 extern void op_nmi_exit(void);
  22 extern void x86_backtrace(struct pt_regs * const regs, unsigned int depth);
  23
  24
  25 int __init oprofile_arch_init(struct oprofile_operations *ops)
  26 {
  27         int ret;
  28
  29         ret = -ENODEV;
  30
  31 #ifdef CONFIG_X86_LOCAL_APIC
  32         ret = op_nmi_init(ops);
  33 #endif
  34 #ifdef CONFIG_X86_IO_APIC
  35         if (ret < 0)
  36                 ret = op_nmi_timer_init(ops);
  37 #endif
  38         ops->backtrace = x86_backtrace;
  39
  40         return ret;
  41 }
  42
  43
  44 void oprofile_arch_exit(void)
  45 {
  46 #ifdef CONFIG_X86_LOCAL_APIC
  47         op_nmi_exit();
  48 #endif
  49 }