xref: /openbmc/linux/arch/x86/kernel/paravirt-spinlocks.c (revision bb0eb050)
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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(long 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);
45 

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