From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Wed, 31 May 2023 16:05:10 +0000 (-0400)
Subject: aarch64: Implement caa_cpu_relax as yield instruction
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=e8363ee3e56dd3532147aa5704cf8107801ded9d;p=userspace-rcu.git

aarch64: Implement caa_cpu_relax as yield instruction

Use the aarch64 "yield" instruction which has the wanted semantic for
caa_cpu_relax.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I9852ae3170d4cc2207f8120355b51c1d0e5e5506
---

diff --git a/include/urcu/arch/aarch64.h b/include/urcu/arch/aarch64.h
index 9e2f1ff..e1925b3 100644
--- a/include/urcu/arch/aarch64.h
+++ b/include/urcu/arch/aarch64.h
@@ -51,6 +51,8 @@ extern "C" {
 # endif
 #endif
 
+#define caa_cpu_relax()	__asm__ __volatile__ ("yield" : : : "memory")
+
 #ifdef __cplusplus
 }
 #endif