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 PV_CALLEE_SAVE_REGS_THUNK(__native_queued_spin_unlock);
  16
  17 bool pv_is_native_spin_unlock(void)
  18 {
  19         return pv_lock_ops.queued_spin_unlock.func ==
  20                 __raw_callee_save___native_queued_spin_unlock;
  21 }
  22
  23 __visible bool __native_vcpu_is_preempted(int cpu)
  24 {
  25         return false;
  26 }
  27 PV_CALLEE_SAVE_REGS_THUNK(__native_vcpu_is_preempted);
  28
  29 bool pv_is_native_vcpu_is_preempted(void)
  30 {
  31         return pv_lock_ops.vcpu_is_preempted.func ==
  32                 __raw_callee_save___native_vcpu_is_preempted;
  33 }
  34
  35 struct pv_lock_ops pv_lock_ops = {
  36 #ifdef CONFIG_SMP
  37         .queued_spin_lock_slowpath = native_queued_spin_lock_slowpath,
  38         .queued_spin_unlock = PV_CALLEE_SAVE(__native_queued_spin_unlock),
  39         .wait = paravirt_nop,
  40         .kick = paravirt_nop,
  41         .vcpu_is_preempted = PV_CALLEE_SAVE(__native_vcpu_is_preempted),
  42 #endif /* SMP */
  43 };
  44 EXPORT_SYMBOL(pv_lock_ops);