GNU Linux-libre 4.14.266-gnu1
[releases.git] / arch / x86 / kernel / paravirt-spinlocks.c
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);