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Linux/arch/x86/kernel/paravirt-spinlocks.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Split spinlock implementation out into its own file, so it can be
  4  * compiled in a FTRACE-compatible way.
  5  */
  6 #include <linux/spinlock.h>
  7 #include <linux/export.h>
  8 #include <linux/jump_label.h>
  9 
 10 #include <asm/paravirt.h>
 11 
 12 __visible void __native_queued_spin_unlock(struct qspinlock *lock)
 13 {
 14         native_queued_spin_unlock(lock);
 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 __visible bool __native_vcpu_is_preempted(long cpu)
 25 {
 26         return false;
 27 }
 28 PV_CALLEE_SAVE_REGS_THUNK(__native_vcpu_is_preempted);
 29 
 30 bool pv_is_native_vcpu_is_preempted(void)
 31 {
 32         return pv_lock_ops.vcpu_is_preempted.func ==
 33                 __raw_callee_save___native_vcpu_is_preempted;
 34 }
 35 
 36 struct pv_lock_ops pv_lock_ops = {
 37 #ifdef CONFIG_SMP
 38         .queued_spin_lock_slowpath = native_queued_spin_lock_slowpath,
 39         .queued_spin_unlock = PV_CALLEE_SAVE(__native_queued_spin_unlock),
 40         .wait = paravirt_nop,
 41         .kick = paravirt_nop,
 42         .vcpu_is_preempted = PV_CALLEE_SAVE(__native_vcpu_is_preempted),
 43 #endif /* SMP */
 44 };
 45 EXPORT_SYMBOL(pv_lock_ops);
 46 

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