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 static bool native_vcpu_is_preempted(int cpu)
  25 {
  26         return 0;
  27 }
  28
  29 struct pv_lock_ops pv_lock_ops = {
  30 #ifdef CONFIG_SMP
  31         .queued_spin_lock_slowpath = native_queued_spin_lock_slowpath,
  32         .queued_spin_unlock = PV_CALLEE_SAVE(__native_queued_spin_unlock),
  33         .wait = paravirt_nop,
  34         .kick = paravirt_nop,
  35         .vcpu_is_preempted = native_vcpu_is_preempted,
  36 #endif /* SMP */
  37 };
  38 EXPORT_SYMBOL(pv_lock_ops);
  39
  40 struct static_key paravirt_ticketlocks_enabled = STATIC_KEY_INIT_FALSE;
  41 EXPORT_SYMBOL(paravirt_ticketlocks_enabled);