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 #include <linux/jump_label.h>
   8
   9 #include <asm/paravirt.h>
  10
  11 #ifdef CONFIG_QUEUED_SPINLOCKS
  12 __visible void __native_queued_spin_unlock(struct qspinlock *lock)
  13 {
  14         native_queued_spin_unlock(lock);
  15 }
  16
  17 PV_CALLEE_SAVE_REGS_THUNK(__native_queued_spin_unlock);
  18
  19 bool pv_is_native_spin_unlock(void)
  20 {
  21         return pv_lock_ops.queued_spin_unlock.func ==
  22                 __raw_callee_save___native_queued_spin_unlock;
  23 }
  24 #endif
  25
  26 struct pv_lock_ops pv_lock_ops = {
  27 #ifdef CONFIG_SMP
  28 #ifdef CONFIG_QUEUED_SPINLOCKS
  29         .queued_spin_lock_slowpath = native_queued_spin_lock_slowpath,
  30         .queued_spin_unlock = PV_CALLEE_SAVE(__native_queued_spin_unlock),
  31         .wait = paravirt_nop,
  32         .kick = paravirt_nop,
  33 #else /* !CONFIG_QUEUED_SPINLOCKS */
  34         .lock_spinning = __PV_IS_CALLEE_SAVE(paravirt_nop),
  35         .unlock_kick = paravirt_nop,
  36 #endif /* !CONFIG_QUEUED_SPINLOCKS */
  37 #endif /* SMP */
  38 };
  39 EXPORT_SYMBOL(pv_lock_ops);
  40
  41 struct static_key paravirt_ticketlocks_enabled = STATIC_KEY_INIT_FALSE;
  42 EXPORT_SYMBOL(paravirt_ticketlocks_enabled);