git.oblomov.eu Git - linux-2.6/blob - arch/x86/kernel/paravirt-spinlocks.c

   1 /*
   2  * Split spinlock implementation out into its own file, so it can be
   3  * compiled in a FTRACE-compatible way.
   4  */
   5 #include <linux/spinlock.h>
   6 #include <linux/module.h>
   7
   8 #include <asm/paravirt.h>
   9
  10 static inline void
  11 default_spin_lock_flags(raw_spinlock_t *lock, unsigned long flags)
  12 {
  13         __raw_spin_lock(lock);
  14 }
  15
  16 struct pv_lock_ops pv_lock_ops = {
  17 #ifdef CONFIG_SMP
  18         .spin_is_locked = __ticket_spin_is_locked,
  19         .spin_is_contended = __ticket_spin_is_contended,
  20
  21         .spin_lock = __ticket_spin_lock,
  22         .spin_lock_flags = default_spin_lock_flags,
  23         .spin_trylock = __ticket_spin_trylock,
  24         .spin_unlock = __ticket_spin_unlock,
  25 #endif
  26 };
  27 EXPORT_SYMBOL(pv_lock_ops);
  28
  29 void __init paravirt_use_bytelocks(void)
  30 {
  31 #ifdef CONFIG_SMP
  32         pv_lock_ops.spin_is_locked = __byte_spin_is_locked;
  33         pv_lock_ops.spin_is_contended = __byte_spin_is_contended;
  34         pv_lock_ops.spin_lock = __byte_spin_lock;
  35         pv_lock_ops.spin_trylock = __byte_spin_trylock;
  36         pv_lock_ops.spin_unlock = __byte_spin_unlock;
  37 #endif
  38 }