[xen master] xen/riscv: introduce spinlock.h

[patchbot@xxxxxxx]

commit 55cd2eaec3b1819284308c5ab533c41c3aae59aa
Author:     Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
AuthorDate: Wed Dec 6 10:20:27 2023 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Dec 6 10:20:27 2023 +0100

    xen/riscv: introduce spinlock.h
    
    Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/riscv/include/asm/spinlock.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/xen/arch/riscv/include/asm/spinlock.h 
b/xen/arch/riscv/include/asm/spinlock.h
new file mode 100644
index 0000000000..bf45a7f005
--- /dev/null
+++ b/xen/arch/riscv/include/asm/spinlock.h
@@ -0,0 +1,15 @@
+#ifndef __ASM_RISCV_SPINLOCK_H
+#define __ASM_RISCV_SPINLOCK_H
+
+#define arch_lock_acquire_barrier() smp_mb()
+#define arch_lock_release_barrier() smp_mb()
+
+#define arch_lock_relax() cpu_relax()
+#define arch_lock_signal() ((void)0)
+#define arch_lock_signal_wmb()      \
+({                                  \
+    smp_wmb();                      \
+    arch_lock_signal();             \
+})
+
+#endif /* __ASM_RISCV_SPINLOCK_H */
--
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