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